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Document and Entity Information - USD ($) $ in Billions	12 Months Ended
Document and Entity Information - USD ($) $ in Billions	Mar. 31, 2019	May 16, 2019	Sep. 30, 2018
Document And Entity Information
Entity Registrant Name	8X8 INC /DE/
Entity Central Index Key	0001023731
Document Type	10-K
Document Period End Date	Mar. 31, 2019
Amendment Flag	false
Current Fiscal Year End Date	--03-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 2.0
Entity Common Stock, Shares Outstanding		96,287,366
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2019

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Current assets:
Cash and cash equivalents	$ 276,583	$ 31,703
Short-term investments	69,899	120,559
Accounts receivable, net	20,181	16,296
Deferred sales commission costs	15,601	0
Other current assets	15,127	10,040
Total current assets	397,391	178,598
Property and equipment, net	52,835	35,732
Intangible assets, net	11,680	11,958
Goodwill	39,694	40,054
Restricted cash	8,100	8,100
Deferred sales commission costs, non-current	33,693	0
Other assets	2,965	2,767
Total assets	546,358	277,209
Current liabilities:
Accounts payable	32,280	23,899
Accrued compensation	18,437	17,412
Accrued taxes	13,862	6,367
Deferred revenue	3,336	2,559
Other accrued liabilities	6,790	6,026
Total current liabilities	74,705	56,263
Convertible senior notes, net	216,035	0
Non-current liabilities	6,222	2,153
Non-current deferred revenue	6	19
Total liabilities	296,968	58,435
Commitments and contingencies (Note 6)
Stockholders' equity:
Preferred stock, $0.001 par value: Authorized: 5,000,000 shares; Issued and outstanding: no shares at March 31, 2019 and 2018	0	0
Common stock, $0.001 par value: Authorized: 200,000,000 shares; Issued and outstanding: 96,119,888 shares and 92,847,354 shares at March 31, 2019 and 2018, respectively	96	93
Additional paid-in capital	506,949	425,790
Accumulated other comprehensive loss	(7,353)	(5,645)
Accumulated deficit	(250,302)	(201,464)
Total stockholders' equity	249,390	218,774
Total liabilities and stockholders' equity	$ 546,358	$ 277,209

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Mar. 31, 2019	Mar. 31, 2018
Stockholders' equity:
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value per share (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	96,119,888	92,847,354
Common stock, shares outstanding (in shares)	96,119,888	92,847,354

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Total revenue	$ 352,586	$ 296,500	$ 253,388
Operating expenses:
Research and development	62,063	36,405	28,999
Sales and marketing	177,976	133,945	98,893
General and administrative	73,563	51,851	41,875
Impairment of goodwill, intangible assets and equipment	0	9,469	0
Total operating expenses	443,574	338,396	260,057
Loss from operations	(90,988)	(41,896)	(6,669)
Other income, net	2,818	3,693	1,792
Loss before provision (benefit) for income taxes	(88,170)	(38,203)	(4,877)
Provision (benefit) for income taxes	569	66,294	(126)
Net loss	$ (88,739)	$ (104,497)	$ (4,751)
Net loss per share:
Basic and diluted (in dollars per share)	$ (0.94)	$ (1.14)	$ (0.05)
Weighted average number of shares:
Basic and diluted (in shares)	94,533	92,017	90,340
Service revenue
Total revenue	$ 334,438	$ 280,430	$ 235,816
Operating expenses:
Cost of revenue	107,192	86,244	70,576
Product revenue
Total revenue	18,148	16,070	17,572
Operating expenses:
Cost of revenue	$ 22,780	$ 20,482	$ 19,714

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (88,739)	$ (104,497)	$ (4,751)
Other comprehensive income (loss), net of tax
Unrealized gains (losses) on investments in securities	473	(259)	70
Foreign currency translation adjustment	(2,181)	4,256	(5,528)
Comprehensive loss	$ (90,447)	$ (100,500)	$ (10,209)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance (in shares) at Mar. 31, 2016		89,213,205
Beginning balance, amount at Mar. 31, 2016	$ 275,306	$ 89	$ 389,260	$ (4,184)	$ (109,859)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under stock plans less withholding taxes (in shares)		2,576,785
Issuance of common stock under stock plans, less withholding taxes	4,560	$ 3	4,557
Withholding taxes from stock plans (in shares)		(289,899)
Withholding taxes from stock plans	(3,004)	$ (1)	(3,003)
Stock-based compensation expense	21,462		21,462
Income tax benefit from stock-based compensation	486		486
Unrealized investment gain (loss)	70			70
Foreign currency translation adjustment	(5,528)			(5,528)
Net loss	(4,751)				(4,751)
Ending balance (in shares) at Mar. 31, 2017		91,500,091
Ending balance, amount at Mar. 31, 2017	288,601	$ 91	412,762	(9,642)	(114,610)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under stock plans less withholding taxes (in shares)		2,709,990
Issuance of common stock under stock plans, less withholding taxes	2,182	$ 3	2,179
Repurchases of common stock (in shares)		(1,362,727)
Repurchases of common stock	(17,934)	$ (1)	(17,933)
Stock-based compensation expense	28,782		28,782
Income tax benefit from stock-based compensation	0
Unrealized investment gain (loss)	(259)			(259)
Foreign currency translation adjustment	4,256			4,256
Net loss	(104,497)				(104,497)
Ending balance (in shares) at Mar. 31, 2018		92,847,354
Ending balance, amount at Mar. 31, 2018	218,774	$ 93	425,790	(5,645)	(201,464)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under stock plans less withholding taxes (in shares)		3,272,534
Issuance of common stock under stock plans, less withholding taxes	4,486	$ 3	4,483
Stock-based compensation expense	45,548		45,548
Income tax benefit from stock-based compensation	0
Unrealized investment gain (loss)	473			473
Foreign currency translation adjustment	(2,181)			(2,181)
Equity component of convertible senior notes, net of issuance costs	31,128		31,128
Net loss	(88,739)				(88,739)
Ending balance (in shares) at Mar. 31, 2019		96,119,888
Ending balance, amount at Mar. 31, 2019	$ 249,390	$ 96	$ 506,949	$ (7,353)	$ (250,302)

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net loss	$ (88,739)	$ (104,497)	$ (4,751)
Adjustments to reconcile net loss to net cash provided by operating activities
Depreciation	8,748	8,171	6,084
Amortization of intangibles	6,175	5,033	3,762
Impairment of goodwill and long-lived assets	0	9,469	15
Amortization of capitalized software	9,748	2,513	591
Amortization of debt discount and issuance costs	1,355	0	0
Amortization of deferred sales commission costs	14,204	0	0
Non-cash lease expense	4,802	0	0
Stock-based compensation expense	44,508	29,176	21,462
Tax benefit from stock-based compensation expense	0	0	(486)
Deferred income tax expense (benefit)	0	66,273	(411)
Gain on escrow settlement	0	(1,393)	0
Other	1,293	677	1,196
Changes in assets and liabilities:
Accounts receivable	(5,393)	(2,402)	(4,799)
Deferred sales commission costs	(25,286)	0	0
Other current and noncurrent assets	(4,337)	(3,149)	(2,515)
Accounts payable and accruals	17,252	11,860	8,135
Deferred revenue	802	310	195
Net cash (used in) provided by operating activities	(14,868)	22,041	28,478
Cash flows from investing activities:
Purchases of property and equipment	(9,096)	(9,178)	(8,851)
Cost of capitalized software	(25,622)	(12,486)	(5,516)
Proceeds from escrow settlement	0	1,393	0
Purchases of investments	(54,127)	(115,224)	(140,026)
Sales of investments	54,642	27,841	41,288
Proceeds from maturities of investments	50,700	100,382	93,795
Acquisition of businesses, net of cash acquired	(5,625)	0	(2,884)
Net cash provided by (used in) investing activities	10,872	(7,272)	(22,194)
Cash flows from financing activities:
Capital lease payments	(949)	(1,079)	(674)
Payment of contingent consideration	0	(150)	(300)
Repurchase of common stock, including for withholding taxes	(7,823)	(22,440)	(3,003)
Tax benefit from stock-based compensation expense	0	0	486
Proceeds from issuance of common stock under employee stock plans	12,202	7,229	5,087
Purchases of capped call	(33,724)	0	0
Net proceeds from issuance of convertible senior notes	279,532	0	0
Net cash provided by (used in) financing activities	249,238	(16,440)	1,596
Effect of exchange rate changes on cash	(362)	444	(426)
Net increase (decrease) in cash and cash equivalents	244,880	(1,227)	7,454
Cash, cash equivalents and restricted cash, beginning of year	39,803	41,030	33,576
Cash, cash equivalents and restricted cash, end of year	284,683	39,803	41,030
Supplemental and non-cash disclosures:
Equipment acquired under capital leases	68	765	1,152
Interest paid	0	36	16
Income taxes paid	$ 356	$ 38	$ 460

THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES

12 Months Ended

Mar. 31, 2019

Accounting Policies [Abstract]

THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES

1. THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES

THE COMPANY

8x8, Inc. ("8x8" or the "Company") was incorporated in California in February 1987 and was reincorporated in Delaware in December 1996.

The Company is a leading cloud provider of enterprise Software-as-a-Service (SaaS) communications solutions, that enable businesses of all sizes to communicate faster and smarter across voice, video meetings, chat and contact centers, transforming both employee and customer experiences with communications that work simply, integrate seamlessly, and perform reliably. From one proprietary cloud technology platform, customers have access to unified communications, team collaboration, video conferencing, contact center, data and analytics and other services. Since fiscal 2004, substantially all revenue has been generated from the sale of communications services and related hardware. Prior to fiscal 2003, the Company's main business was Voice over Internet Protocol semiconductors.

The Company's fiscal year ends on March 31 of each calendar year. Each reference to a fiscal year in these notes to the consolidated financial statements refers to the fiscal year ended March 31 of the calendar year indicated (for example, fiscal 2019 refers to the fiscal year ended March 31, 2019).

Acquisitions

In January 2017, the Company entered into an agreement with the preferred and common shareholders LeChat Inc. pursuant to which the Company purchased technology and other assets to enable cross team messaging and collaboration within the Company's cloud technology platform.

In April 2018, the Company entered into an asset purchase agreement with MarianaIQ, Inc., pursuant to which the Company purchased technology and other assets to strengthen the artificial intelligence and machine learning capabilities of the Company's X Series product suite.

In October 2018, the Company entered into an asset purchase agreement with Atlassian Corporation PLC for the purchase of the Jitsi video collaboration technology (Jitsi). Jitsi extends the Company's cloud technology platform with scalable video routing and interoperability capabilities built on industry standards such as WebRTC.

See Note 12 for further discussion.

PRINCIPLES OF CONSOLIDATION

The consolidated financial statements include the accounts of 8x8 and its subsidiaries. All material intercompany accounts and transactions have been eliminated.

Reclassifications

Certain amounts previously reported as selling and marketing expenses have been reclassified to cost of sales, research and development expenses, and general and administrative expenses within the consolidated statements of operations to conform to the current period presentation. The reclassification had no impact on the Company's previously reported net loss, cash flows, or basic or diluted net loss per share amounts. See Note 14 for further information.

USE OF ESTIMATES

The preparation of the consolidated financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities and equity and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. On an ongoing basis, the Company evaluates its estimates, including, but not limited to, those related to bad debts, returns reserve for expected cancellations, income and sales tax, and litigation and other contingencies. The Company bases its estimates on historical experience and on various other assumptions. Actual results could differ from those estimates under different assumptions or conditions.

REVENUE RECOGNITION

The Company recognizes service revenue, mainly from subscription services to its cloud-based voice, call center, video and collaboration solutions using the five-step model as prescribed by ASU No. 2014-09, Revenue from Contracts with Customers (ASC 606), as amended: Topic 606:

• Identification of the contract, or contracts, with a customer;

• Identification of the performance obligations in the contract;

• Determination of the transaction price;

• Allocation of the transaction price to the performance obligations in the contract; and

• Recognition of revenue when or as, the Company satisfies a performance obligation.

The Company identifies performance obligations in contracts with customers, which may include subscription services and related usage, product revenue and professional services. The transaction price is determined based on the amount the Company expects to be entitled to receive in exchange for transferring the promised services or products to the customer. The transaction price in the contract is allocated to each distinct performance obligation in an amount that represents the relative amount of consideration expected to be received in exchange for satisfying each performance obligation. Revenue is recognized when performance obligations are satisfied. Revenues are recorded based on the transaction price excluding amounts collected on behalf of third parties such as sales and telecommunication taxes, which are collected on behalf of and remitted to governmental authorities. The Company usually bills its customers on a monthly basis. Contracts typically range from annual to multi-year agreements with payment terms of net 30 days or less. The Company occasionally allows a 30-day period to cancel a subscription and return products shipped for a full refund.

Judgments and Estimates

The estimation of variable consideration for each performance obligation requires the Company to make subjective judgments. The Company has service-level agreements with customers warranting defined levels of uptime reliability and performance. Customers may get credits or refunds if the Company fails to meet such levels. If the services do not meet certain criteria, fees are subject to adjustment or refund representing a form of variable consideration. The Company may impose minimum revenue commitments (MRC) on its customers at the inception of the contract. Thus, in estimating variable consideration for each of these performance obligations, the Company assesses both the probability of MRC occurring and the collectability of the MRC, of which both represent a form of variable consideration.

The Company enters into contracts with customers that regularly include promises to transfer multiple services and products, such as subscriptions, products, and professional services. For arrangements with multiple services, the Company evaluates whether the individual services qualify as distinct performance obligations. In its assessment of whether a service is a distinct performance obligation, the Company determines whether the customer can benefit from the service on its own or with other readily available resources, and whether the service is separately identifiable from other services in the contract. This evaluation requires the Company to assess the nature of each individual service offering and how the services are provided in the context of the contract, including whether the services are significantly integrated, highly interrelated, or significantly modify each other, which may require judgment based on the facts and circumstances of the contract.

When agreements involve multiple distinct performance obligations, the Company allocates arrangement consideration to all performance obligations at the inception of an arrangement based on the relative standalone selling prices (SSP) of each performance obligation. Usage fees deemed to be variable consideration meet the allocation exception for variable consideration. Where the Company has standalone sales data for its performance obligations which are indicative of the price at which the Company sells a promised good or service separately to a customer, such data is used to establish SSP. In instances where standalone sales data is not available for a particular performance obligation, the Company estimates SSP by the use of observable market and cost-based inputs. The Company continues to review the factors used to establish list price and will adjust standalone selling price methodologies as necessary on a prospective basis.

Service Revenue

Service revenue from subscriptions to the Company's cloud-based technology platform is recognized over time on a ratable basis over the contractual subscription term beginning on the date that the platform is made available to the customer to the end of the contractual period. This ratable basis depicts the continuous access to the Company's services. Payments received in advance of subscription services being rendered are recorded as a deferred revenue. Usage fees, either bundled or not bundled, are recognized when the Company has a right to invoice. Professional services for configuration, system integration, optimization, customer training or education are primarily billed on a fixed-fee basis and are performed by the Company directly or, alternatively, customers may also choose to perform these services themselves or engage their own third-party service providers. Professional services revenue is recognized over time as the services are rendered. When a contract with a customer is signed, the Company assesses whether collection of the fees under the arrangement is probable. The Company estimates the amount to reserve for uncollectible amounts based on the aging of the contract balance, current and historical customer trends, and communications with its customers. These reserves are recorded as operating expenses against the contract asset (Accounts Receivable). In the normal course of business, the Company records revenue reductions for customer credits.

Product Revenue

The Company recognizes product revenue for telephony equipment at a point in time, when transfer of control has occurred, which is generally upon shipment. Sales returns are recorded as a reduction to revenue estimated based on historical experience.

Contract Assets

Contract assets are recorded for those parts of the contract consideration not yet invoiced but for which the performance obligations are completed. The revenue is recognized when the customer receives services or equipment for a reduced consideration at the onset of an arrangement, for example when the initial month's services or equipment are discounted. Contract assets are included in other current or non-current assets in the consolidated balance sheets, depending on if their reduction will be recognized during the succeeding twelve-month period or beyond.

Deferred Revenue

Deferred revenues represent billings or payments received in advance of revenue recognition and is recognized upon transfer of control. Balances consist primarily of annual plan subscription services and professional and training services not yet provided as of the balance sheet date. Deferred revenues that will be recognized during the succeeding twelve-month period are recorded as current deferred revenues in the consolidated balance sheets, with the remainder recorded as other non-current liabilities in the consolidated balance sheets.

Deferred Sales Commission Costs

Sales commissions are considered incremental and recoverable costs of acquiring customer contracts. These costs are capitalized as other current or non-current assets and amortized on a straight-line basis over the anticipated benefit period, which is five years. The benefit period was estimated by taking into consideration the length of customer contracts, technology lifecycle, and other factors. This amortization expense is recorded in sales and marketing expense within the Company's consolidated statement of operations.

Practical Expedients

The new guidance under ASC 340-40, Other Assets and Deferred Costs - Contracts with Customers, sets forth the requirement of deferring incremental costs of obtaining a contract, typically sales commissions, that were expensed as incurred under the previous guidance. The Company applies a practical expedient that permits it to apply Subtopic 340-40 to a portfolio of contracts, instead of on a contract-by-contract basis, as they are similar in their characteristics, and the financial statement effects of applying Subtopic 340-40 to that portfolio would not differ materially from applying it to the individual contracts within that portfolio.

CASH, CASH EQUIVALENTS AND INVESTMENTS

The Company considers all highly liquid investments with an original maturity of three months or less to be cash equivalents.

At March 31, 2019 and 2018, all investments were classified as available-for-sale and reported at fair value, based either upon quoted prices in active markets, quoted prices in less active markets, or quoted market prices for similar investments, with unrealized gains and losses, net of related tax, if any, included in other comprehensive income (loss) and disclosed as a separate component of stockholders' equity. Realized gains and losses on sales of all such investments are reported within the caption of other income in the consolidated statements of operations and computed using the specific identification method. The Company classifies its investments as current based on the nature of the investments and their availability for use in current operations. The Company's investments in marketable securities are monitored on a periodic basis for impairment. In the event that the carrying value of an investment exceeds its fair value and the decline in value is determined to be other-than-temporary, an impairment charge is recorded and a new cost basis for the investment is established. These available-for-sale investments are primarily held in the custody of one major financial institution.

ACCOUNTS RECEIVABLE ALLOWANCE

The Company estimates the amount of uncollectible accounts receivable at the end of each reporting period based on the aging of the receivable balance, current and historical customer trends, and communications with its customers. Amounts are written off only after considerable collection efforts have been made and the amounts are determined to be uncollectible.

PROPERTY AND EQUIPMENT

Property and equipment are stated at cost less accumulated depreciation and amortization. Depreciation and amortization are computed using the straight-line method. Estimated useful lives of three years are used for equipment, software and software development costs and five years for furniture and fixtures. Amortization of leasehold improvements is computed using the shorter of the remaining facility lease term or the estimated useful life of the improvements.

Maintenance, repairs and ordinary replacements are charged to expense. Expenditures for improvements that extend the physical or economic life of the property are capitalized. Gains or losses on the disposition of property and equipment are recorded in the Consolidated Statements of Operations.

Construction in progress primarily relates to costs to acquire or internally develop software for internal use not fully completed as of March 31, 2019 and 2018.

ACCOUNTING FOR LONG-LIVED ASSETS

The Company reviews the recoverability of its long-lived assets, such as property and equipment, definite lived intangibles or capitalized software, when events or changes in circumstances occur that indicate that the carrying value of the asset or asset group may not be recoverable. Examples of such events could include a significant disposal of a portion of such assets, an adverse change in the market involving the business employing the related asset or a significant change in the operation or use of an asset. The assessment of possible impairment is based on the Company's ability to recover the carrying value of the asset or asset group from the expected future cash flows (undiscounted and without interest charges) of the related operations. If these cash flows are less than the carrying value of such asset or asset group, an impairment loss is recognized for the difference between estimated fair value and carrying value. The measurement of impairment requires management to estimate the fair value of long-lived assets and asset groups through future cash flows. See Note 4 for further discussion on impairment charges incurred.

GOODWILL AND OTHER INTANGIBLE ASSETS

Goodwill represents the excess fair value of consideration transferred over the fair value of net assets acquired in business combinations. Goodwill and intangible assets with indefinite useful lives are not amortized but are tested annually for impairment and more often if there is an indicator of impairment. For the year ended March 31, 2018, the Company had determined that it had three reporting units and allocated goodwill to the reporting units for the purposes of its annual impairment test. For the year ended March 31, 2019, the Company has determined it had one reporting unit. The change in reporting units resulted from the following events:


•	As of April 1, 2018, The Company's DXI operations no longer operated on a standalone basis and was integrated into the Company's existing United Kingdom operations, and


•	During the third fiscal quarter of 2019, the Company assessed it had only one Chief Operating Decision Maker, who reviewed financial results on a consolidated basis. See Note 11 for further discussion.

The Company's annual goodwill impairment test is performed on January 1 each year. No goodwill impairment charges were recorded in the periods presented. The Company early adopted the provisions of ASU 2017-04, Simplifying the Test for Goodwill, for its annual impairment test. See Recently Adopted Accounting Pronouncements for further discussion.

Intangible assets with finite useful lives are amortized on a straight-line basis over the periods benefited. Amortization expense for the customer relationship intangible asset is included in sales and marketing expenses. Amortization expense for acquired technology, software or internally developed software is included in cost of service revenue.

CONVERTIBLE SENIOR NOTES

In accounting for the issuance of the convertible senior notes (the Notes), the Notes were separated into liability and equity components. The carrying amounts of the liability component was calculated by measuring the fair value of similar liabilities that do not have associated convertible features. The carrying amount of the equity component representing the conversion option was determined by deducting the fair value of the liability component from the par value of the respective Notes. This difference represents the debt discount that is amortized to interest expense over the respective terms of the Notes using the effective interest rate method. The equity component was recorded in additional paid-in capital and is not remeasured as long as it continues to meet the accounting requirements for equity classification.

In accounting for the debt issuance costs related to the Notes, the Company allocated the total amount incurred to the liability and equity components of the Notes based on their relative fair values. Issuance costs attributable to the liability component are being amortized to interest expense over the contractual term of the Notes. The issuance costs attributable to the equity component, representing the conversion option, were netted against the equity component in additional paid-in capital.

WARRANTY EXPENSE

The Company accrues for estimated product warranty cost upon revenue recognition. Accruals for product warranties are calculated based on the Company's historical warranty experience adjusted for any specific requirements. The Company's warranty accruals are recorded in current other accrued liabilities in the consolidated balance sheets.

RESEARCH & DEVELOPMENT AND SOFTWARE DEVELOPMENT COSTS

Software developed or obtained for internal use in accordance with ASC 350-40, Internal-Use Software (ASC 350-40), is capitalized during the application development stage. In accordance with authoritative guidance, the Company begins to capitalize costs to develop software when preliminary development efforts are successfully completed, management has authorized and committed project funding, and it is probable that the project will be completed, and the software will be used as intended. Once the project has been completed, these costs are amortized to cost of service revenue on a straight - line basis over the estimated useful life of the related asset, generally estimated to be three years. Costs incurred prior to meeting these criteria together with costs incurred for training and maintenance are expensed as incurred and recorded in research and development expense on our consolidated statements of operations. The Company classifies software development costs associated with the development of the Company's products and services as property and equipment.

ADVERTISING COSTS

Advertising costs are expensed as incurred and were $25.0 million, $14.5 million and $9.5 million for the years ended March 31, 2019, 2018 and 2017, respectively.

FOREIGN CURRENCY TRANSLATION

The Company has determined that the functional currency of each of its foreign subsidiaries are the subsidiary's local currency. The Company believes this most appropriately reflects the current economic facts and circumstances of the Company's subsidiaries' operations. The assets and liabilities of the subsidiaries are translated at the applicable exchange rate as of the end of the balance sheet period, and revenue and expenses are translated at an average rate over the period presented. Resulting currency translation adjustments are recorded as a component of accumulated other comprehensive income or loss within the stockholder's equity.

SEGMENT INFORMATION

The Company has determined the chief executive officer is its chief operating decision maker. The chief executive officer reviews financial information presented on a consolidated basis for purposes of assessing performance and making decisions on how to allocate resources. The Company has determined that it operates in a single reportable segment.

CONCENTRATIONS

Financial instruments that potentially subject the Company to significant concentrations of credit risk consist principally of cash and cash equivalents, investments and trade accounts receivable. The Company has cash equivalents and investment policies that limit the amount of credit exposure to any one financial institution and restrict placement of these funds to financial institutions evaluated as highly credit-worthy. The Company has not experienced any material losses relating to its investments.

The Company sells its products to business customers and distributors. The Company performs ongoing credit evaluations of its customers' financial condition and generally does not require collateral from its customers. At March 31, 2019 and 2018, no customer accounted for more than 10% of accounts receivable.

The Company purchases all of its hardware products from suppliers that manufacturer the hardware directly. The inability of any supplier to fulfill supply requirements of the Company could materially impact future operating results, financial position or cash flows.

The Company also relies primarily on third-party network service providers to provide telephone numbers and PSTN call termination and origination services for its customers. If these service providers failed to perform their obligations to the Company, such failure could materially impact future operating results, financial position and cash flows.

FAIR VALUE OF FINANCIAL INSTRUMENTS

The Company defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities required or permitted to be recorded at fair value, the Company considers the principal market or the most advantageous market in which it would transact.

The accounting guidance for fair value measurement requires the Company to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. Observable inputs are inputs that reflect the assumptions market participants would use in valuing the asset or liability and are developed based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that reflect the Company's assumptions about the factors that market participants would use in valuing the asset or liability developed based on the best information available in the circumstances.

The standard establishes a fair value hierarchy based on the level of independent, objective evidence surrounding the inputs used to measure fair value by requiring that the most observable inputs be used when available. A financial instrument's categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The fair value hierarchy is as follows:


•	Level 1 applies to assets or liabilities for which there are quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.

•

Level 2 applies to assets or liabilities for which there are inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly, such as quoted prices for similar assets or liabilities in active markets; quoted prices for identical assets or liabilities in markets with insufficient volume or infrequent transactions (less active markets).


•	Level 3 applies to assets or liabilities for which fair value is derived from valuation techniques in which one or more significant inputs are unobservable, including the Company's own assumptions.

The estimated fair value of financial instruments is determined by the Company using available market information and valuation methodologies considered to be appropriate. The carrying amounts of the Company's cash and cash equivalents, accounts receivable and accounts payable approximate their fair values due to their short maturities. The Company's investments and convertible senior notes payable are carried at fair value.

ACCOUNTING FOR STOCK-BASED COMPENSATION

The Company accounts for its employee stock options and other stock awards under the provisions of ASC 718 - Stock Compensation. Stock-based compensation cost is measured at the grant date, based on the estimated fair value of the award, and is recognized as an expense over the employee's requisite service period (generally the vesting period of the equity grant), net of estimated forfeitures.

To value option grants the Company uses the Black-Scholes option valuation model. Fair value determined using the Black-Scholes option valuation model varies based on assumptions used for the expected stock prices volatility, expected life, risk-free interest rates and future dividend payments. The Company used the historical volatility of its stock over a period equal to the expected life of the options. The expected life assumptions represent the weighted-average period stock-based awards are expecting to remain outstanding. These expected life assumptions were established through the review of historical exercise behavior of stock-based award grants with similar vesting periods. The risk-free interest rates were based on the closing market bid yields of actively traded U.S. treasury securities in the over-the-counter market for the expected term equal to the expected term of the option. The dividend yield assumption is based on the Company's history of not paying dividends.

The Company issued performance stock units (PSUs) to a group of executives with vesting that is contingent on both market performance and continued service during the fiscal year ended March 31, 2019:

•

These PSUs vest (1) 50% on October 23, 2020 and (2) 50% on October 23, 2021, in each case subject to the performance of the Company's common stock relative to the Russell 2000 Index (the benchmark) during the period from grant date through such vesting date. A 2x multiplier will be applied to the total shareholder returns (TSR), such that the number of shares earned will increase or decrease by 2% of the target numbers, for each 1% of positive or negative relative TSR. In the event the Company's common stock performance is below negative 30% relative to the benchmark, no shares will be issued. In no event will the number of shares issued in each tranche exceed 200% of the target for that tranche.

The Company issued PSUs to a group of executives with vesting that is contingent on both market performance and continued service during the fiscal year ended March 31, 2018:

•

These PSUs vest (1) 50% on September 22, 2018 and (2) 50% on September 27, 2019, in each case subject to the performance of the Company's common stock relative to the Russell 2000 Index (the benchmark) during the period from grant date through such vesting date. A 2x multiplier will be applied to the total shareholder returns (TSR), such that the number of shares earned will increase or decrease by 2% of the target numbers, for each 1% of positive or negative relative TSR. In the event the Company's common stock performance is below negative 30%, relative to the benchmark, no shares will be issued. In no event will the number of shares issued in each tranche exceed 200% of the target for that tranche.

To value these market-based PSUs under the Equity Compensation Plans, the Company used a Monte Carlo simulation model on the date of grant. Fair value determined using the Monte Carlo simulation model varies based on the assumptions used for the expected stock price volatility, the correlation coefficient between the Company and the NASDAQ Composite Index, risk-free interest rates, and future dividend payments.

RESEARCH AND DEVELOPMENT COSTS

Research and development expenses consist primarily of personnel, consulting and equipment costs necessary for the Company to conduct development and engineering efforts. Research and development costs are expensed as incurred.

COMPREHENSIVE INCOME (LOSS)

Comprehensive income (loss), as defined, includes all changes in equity (net assets) during a period. The difference between net income (loss) and comprehensive income (loss) is due to foreign currency translation adjustments and unrealized gains or losses on investments classified as available-for-sale.

NET INCOME (LOSS) PER SHARE

Basic net income (loss) per share is computed by dividing net income (loss) available to common stockholders (numerator) by the weighted average number of vested, unrestricted common shares outstanding during the period (denominator). Diluted net income (loss) per share is computed on the basis of the weighted average number of shares of common stock plus the effect of dilutive potential common shares outstanding during the period using the treasury stock method unless their effect is anti-dilutive. Dilutive potential common shares include outstanding stock options, employee shares purchase programs (ESPP), and restricted stock units (RSUs).

The Company would include the dilutive effects of the Convertible Senior Notes (the Notes) (see Note 7) in the calculation of diluted net income per common share if the average market price is above the conversion price. Upon conversion of the Notes, it is the Company’s intention to pay cash equal to the lesser of the aggregate principal amount or the conversion value of the Notes being converted, therefore, only the conversion spread relating to the Notes would be included in the Company’s diluted earnings per share calculation unless their effect is anti-dilutive.

DEFERRED RENT

The Company recognizes rent expense on a straight-line basis for all operating lease arrangements with the difference between required lease payments and rent expense recorded as deferred rent. The difference results from rent holidays, rent escalations and tenant improvement allowances, which are amortized over the lease term.

RECENTLY ADOPTED ACCOUNTING PRONOUNCEMENTS

In May 2014, the Financial Accounting Standards Board (FASB) issued ASC 606-Revenue from Contracts with Customers (ASC 606), which replaces numerous requirements in U.S. GAAP and provide companies with a single revenue recognition model for recognizing revenue from contracts with customers. On April 1, 2018, the Company adopted ASC 606 using the modified retrospective method and applied Topic 606 to those contracts which were not completed as of April 1, 2018. Under the modified retrospective method the Company's fiscal 2018 and 2017 consolidated statement of operations were not restated. As such, revenues for those fiscal years were reported under the previous guidance of ASC 605, Revenue Recognition.

The Company recognized the cumulative effect of initially applying ASC 606 as an adjustment to retained earnings in the consolidated balance sheet as of April 1, 2018 (in thousands).



	Balance at March 31, 2018			Adjustments Due to ASC 606		Balance at April 1, 2018
Current assets:
Deferred sales commission costs	$	—		$	11,234	$	11,234
Other current assets	$	10,040		$	1,725	$	11,765
Non-current assets:
Deferred sales commission costs	$	—		26,942		$	26,942
Stockholders' Equity
Accumulated deficit	$	(201,464	)	$	39,901	$	(161,563	)

The following tables summarize the impacts of ASC 606 adoption on the Company's financial statements for the periods ended March 31, 2019:

Selected Consolidated Balance Sheet Line Items (in thousands):



	March 31, 2019
	ASC 605			Adjustments		(As Reported) ASC 606
Current assets:
Deferred sales commission costs	$	—		$	15,601	$	15,601
Other current assets	$	9,410		$	5,717	$	15,127
Non-current assets:
Deferred sales commission costs	$	—		$	33,693	$	33,693
Stockholders' Equity
Accumulated deficit	$	(305,313	)	$	55,011	$	(250,302	)

Selected Consolidated Statement of Operations Line Items (in thousands, except per share amounts):



	Twelve Months Ended March 31, 2019
	ASC 605			Adjustments			(As Reported) ASC 606
Service revenue	$	335,671		$	(1,233	)	$	334,438
Product revenue	16,271			1,877			18,148
Total revenue	$	351,942		$	644		$	352,586
Operating expenses:
Sales and marketing	$	189,058		$	(11,082	)	$	177,976
Loss from operations	$	(102,714	)	$	11,726		$	(90,988	)
Net loss	$	(100,465	)	$	11,726		$	(88,739	)
Net loss per share:
Basic and Diluted	$	(1.06	)	$	0.12		$	(0.94	)

Selected Consolidated Statements of Cash Flows Line Items (in thousands):



	Twelve Months Ended March 31, 2019
	ASC 605			Adjustments			(As Reported) ASC 606
Net loss	$	(100,465	)	$	11,726		$	(88,739	)
Amortization of deferred sales commission costs	$	—		$	14,204		$	14,204
Deferred sales commission costs	$	—		$	(25,286	)	$	(25,286	)
Other current and non-current assets	$	(3,693	)	$	(644	)	$	(4,337	)
Net cash provided by operating activities	$	(14,868	)	$	—		$	(14,868	)

In January 2016, the FASB issued Accounting Standards Update (ASU) No. 2016-01 Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, which amends various aspects of the recognition, measurement, presentation, and disclosure of financial instruments This amendment is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Therefore, the Company has prospectively adopted this new standard on April 1, 2018. The adoption of this standard did not have a material impact on the Company's consolidated financial statements.

In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments, which provides guidance on how certain cash receipts and cash payments are to be presented and classified in the statement of cash flows. This amendment is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Therefore, the Company has prospectively adopted this new standard on April 1, 2018. The adoption of this standard did not have a material impact on the consolidated statement of cash flows.

In October 2016, the FASB has issued ASU No. 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory, which provides guidance on how an entity should recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. This amendment is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Therefore, the Company has prospectively adopted this new standard on April 1, 2018. The adoption of this standard did not have a material impact on the Company's consolidated financial statements.

In January 2017, the FASB issued Accounting Standards Update ASU No. 2017-04, Simplifying the Test for Goodwill Impairment, which simplifies the subsequent measurement of goodwill by removing the requirement to perform a hypothetical purchase price allocation to compute the implied fair value of goodwill to measure impairment. Instead, any goodwill impairment will equal the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. Furthermore, the ASU eliminates the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment and, if it fails that qualitative test, to perform step 2 of the goodwill impairment test. As permitted by the ASU, the Company have elected to early adopt this guidance for our fiscal 2019 goodwill impairment test, which was performed during the fourth quarter of fiscal 2019. The adoption of this guidance did not have a material impact on our consolidated financial statements.

RECENT ACCOUNTING PRONOUNCEMENTS

In February 2016, the FASB issued ASU 2016-2, Leases (Topic 842), along with amendments issued in 2018, which requires companies to generally recognize on the balance sheet operating and financing lease liabilities and corresponding right-of-use assets. The update also requires qualitative and quantitative disclosures designed to assess the amount, timing, and uncertainty of cash flows arising from leases. The update requires the use of a modified retrospective transition approach, which includes a number of optional practical expedients that entities may elect to apply. Among the subsequent amendments, an optional transition method was provided. This amendment is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. The Company expects the adoption to have a material impact to the consolidated balance sheets for the recording of the "right-to-use" asset and corresponding contract liability. The Company is currently scoping the definition of a lease under ASC 842 to determine the "right-to-use" asset and corresponding liability in accordance with the standard. The Company plans to adopt the ASU utilizing the current period adjustment method on April 1, 2019 and expects to record approximately $13.1 to $14.1 million right-of-use assets and $15.0 to $16.0 million lease liability on its consolidated balance sheet. The amount of the Company's deferred rent as of March 31, 2019 of $1.9 million will be removed upon adoption.

In June 2018, the FASB issued ASU 2018-7, Compensation-Stock Compensation (Topic 718), which now provides guidance for share-based payments to non-employees, resulting in alignment in accounting for employees and non-employees. The amendment is effective for public companies with fiscal years beginning after December 15, 2018. Early adoption is permitted. The Company estimates the impact of this pronouncement to its consolidated financial statements to be immaterial.

In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820), which makes modifications to disclosure requirements on fair value measurements. The amendment is effective for public companies with fiscal years beginning after December 15, 2019. Early adoption is permitted. The Company is currently assessing the impact of this pronouncement to its consolidated financial statements.

In August 2018, the FASB issued 2018-15, Intangibles-Goodwill and Other-Internal Use Software (Subtopic 350-40), which reduces complexity for the accounting for the accounting for costs of implementing a cloud computing service arrangement. The amendment is effective for public companies with fiscal years beginning after December 15, 2019. Early adoption is permitted. The Company is currently assessing the impact of this pronouncement to its consolidated financial statements.

REVENUE RECOGNITION

12 Months Ended

Mar. 31, 2019

Revenue from Contract with Customer [Abstract]

REVENUE RECOGNITION

Disaggregation of Revenue

The Company disaggregates its revenue by geographic region. See Note 11 for more information.

Contract Balances

The following table provides information about receivables, contract assets and deferred revenues from contracts with customers (in thousands):



	March 31, 2019
Accounts receivable, net	$	20,181
Other current assets	$	5,717
Deferred revenue - current	$	3,336
Deferred revenue - non-current	$	6

Changes in the contract assets and the deferred revenue balances during the twelve months ended March 31, 2019 are as follows (in thousands):



	April 1, 2018		March 31, 2019		$ Change
Other current assets	$	1,725	$	5,717	$	3,992
Deferred revenue	$	2,578	$	3,342	$	764

The change in contract assets was primarily driven by the recognition of revenue that has not yet been billed. The increase in deferred revenues was due to billings in advance of performance obligations being satisfied. Revenues of approximately $2.5 million recognized during the year ended March 31, 2019 were included in the contract liabilities balance at April 1, 2018.

Remaining Performance Obligations

The Company's subscription terms typically range from one to four years. Contract revenue as of March 31, 2019, that has not yet been recognized was approximately $170.0 million. This excludes contracts with an original expected length of one year or less. The Company expects to recognize revenue on the vast majority of the remaining performance obligation over the next 24 months.

FAIR VALUE MEASUREMENTS

12 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

Cash, cash equivalents and available-for-sale investments were (in thousands):



As of March 31, 2019	Amortized Costs		Gross Unrealized Gain		Gross Unrealized Loss			Estimated Fair Value		Cash and Cash Equivalents		Short-Term Investments
Cash	$	25,364	$	—	$	—		$	25,364	$	25,364	$	—
Level 1:
Money market funds	251,219		—		—			251,219		251,219		—
Subtotal	276,583		—		—			276,583		276,583		—
Level 2:
Corporate debt	46,516		51		(29		)	46,538		—		46,538
Municipal securities	5,511		17		—			5,528		—		5,528
Asset backed securities	13,596		9		(17		)	13,588		—		13,588
Agency bond	4,260		—		(15		)	4,245		—		4,245
Subtotal	69,883		77		(61		)	69,899		—		69,899
Total assets	$	346,466	$	77	$	(61	)	$	346,482	$	276,583	$	69,899



As of March 31, 2018	Amortized Costs		Gross Unrealized Gain		Gross Unrealized Loss			Estimated Fair Value		Cash and Cash Equivalents		Short-Term Investments
Cash	$	16,499	$	—	$	—		$	16,499	$	16,499	$	—
Level 1:
Money market funds	15,204		—		—			15,204		15,204		—
Subtotal	31,703		—		—			31,703		31,703		—
Level 2:
Commercial paper	13,254		—		(8		)	13,246		—		13,246
Corporate debt	70,631		6		(296		)	70,341		—		70,341
Asset backed securities	3,385		3		(1		)	3,387		—		3,387
Mortgage backed securities	27,063		1		(119		)	26,945		—		26,945
Agency bond	4,183		—		(35		)	4,148		—		4,148
Subtotal	121,013		10		(464		)	120,559		—		120,559
Total assets	$	152,716	$	10	$	(464	)	$	152,262	$	31,703	$	120,559

As of March, 31, 2019, the estimated fair value of the Company's outstanding convertible senior notes (the Notes) was $216.0 million. The fair value of the Notes was determined based on the closing price for the Notes on the last trading day of the reporting period and is considered as Level 2 in the fair value hierarchy.

Contractual maturities of investments as of March 31, 2019 are set forth below (in thousands):



	Estimated Fair Value
Due within one year	$	32,385
Due after one year	37,514
Total	$	69,899

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

PROPERTY AND EQUIPMENT

12 Months Ended

Mar. 31, 2019

Property, Plant and Equipment [Abstract]

PROPERTY AND EQUIPMENT

Property and equipment consisted of the following (in thousands):



	March 31,
	2019			2018
Computer equipment	$	34,706		$	29,761
Software development costs	39,131			20,144
Software licenses	9,713			8,663
Leasehold improvements	6,286			6,573
Furniture and fixtures	2,324			1,637
Construction in progress	10,071			2,394
	102,231			69,172
Less: accumulated depreciation and amortization	(49,396		)	(33,440		)
	$	52,835		$	35,732

INTANGIBLE ASSETS, GOODWILL AND OTHER ASSETS

12 Months Ended

Mar. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

INTANGIBLE ASSETS, GOODWILL AND OTHER ASSETS

The carrying value of intangible assets consisted of the following (in thousands):



	March 31, 2019							March 31, 2018
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Technology	$	25,702	$	(15,409	)	$	10,293	$	19,702	$	(10,535	)	$	9,167
Customer relationships	9,467		(8,080		)	1,387		9,776		(7,366		)	2,410
Trade names/domains	2,108		(2,108		)	—		2,108		(1,727		)	381
Total acquired identifiable intangible assets	$	37,372	$	(25,692	)	$	11,680	$	31,681	$	(19,723	)	$	11,958

At March 31, 2019, annual amortization of definite lived intangible assets, based upon existing intangible assets and current useful lives, is estimated to be the following (in thousands):



	Amount
2020	$	6,116
2021	3,569
2022	1,766
2023	229
Total	$	11,680

Impairment of Long-Lived Assets and Goodwill

During the third quarter of fiscal year 2018, the Company changed its product and marketing strategy for the use of DXI's technology and re-assessed DXI's profitability outlook. This triggered the requirement that the Company test the recorded goodwill for impairment in accordance with ASC 350-20-35. First, the Company estimated the fair value of its three reporting units at the time using the market approach. Under the market approach, the Company utilized the market capitalization of its publicly-traded shares and comparable company information to determine revenue multiples which were used to determine the fair value of the reporting unit. Based on this approach, the Company determined that there was an indication of impairment only for its DXI reporting unit, which was within the Company's Europe reporting segment, as the carrying value including goodwill exceeded the estimated fair value. As largely independent cash flows could not be attributed to any assets individually the Company evaluated DXI's assets and liabilities as one asset group. Then the Company estimated the fair value of DXI's asset group using discounted cash flow methods to determine the implied fair value of goodwill. The difference between this implied fair value of the goodwill and its carrying value was recorded as impairment. The outcome of the analysis resulted in a non-cash expense for impairment of property and equipment, intangible assets and goodwill of $0.3 million, $1.2 million, $8.0 million, respectively, which was recorded during the third quarter of fiscal year 2018 as a separate line item in the Company's Consolidated Statements of Operations.

The following table provides a summary of the changes in the carrying amounts of goodwill (in thousands):



	Total
Balance at March 31, 2017	46,136
Impairment loss	(8,036	)
Foreign currency translation	1,954
Balance at March 31, 2018	40,054
Balance at Additions due to acquisitions	500
Foreign currency translation	(860	)
Balance at March 31, 2019	39,694

Deferred Sales Commission Costs

Amortization expense for the deferred sales commission costs for the year ended March 31, 2019, was $14.2 million. Prior to the adoption of ASC 606, the Company did not defer sales commission costs. There were no impairment losses relative to the costs capitalized for the year ended March 31, 2019.

COMMITMENTS AND CONTINGENCIES

12 Months Ended

Mar. 31, 2019

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

Guarantees

Indemnifications

In the normal course of business, the Company may agree to indemnify other parties, including customers, lessors and parties to other transactions with the Company, with respect to certain matters such as breaches of representations or covenants or intellectual property infringement or other claims made by third parties. These agreements may limit the time within which an indemnification claim can be made and the amount of the claim. In addition, the Company has entered into indemnification agreements with its officers and directors.

It is not possible to determine the maximum potential amount of the Company's exposure under these indemnification agreements due to the limited history of prior indemnification claims and the unique facts and circumstances involved in each particular agreement. Historically, payments made by the Company under these agreements have not had a material impact on the Company's operating results, financial position or cash flows. Under some of these agreements, however, the Company's potential indemnification liability might not have a contractual limit.

Product Warranties

The Company accrues for the estimated costs that may be incurred under its product warranties upon revenue recognition.

Operating Leases

The Company's operating lease obligations consist of the Company's principal facility and various leased facilities under operating lease agreements, which expire on various dates from fiscal 2020 through fiscal 2026. The Company leases its headquarters facility in San Jose, California under an operating lease agreement that expires in October 2019.

On January 23, 2018, the Company entered into a 132-month lease to rent approximately 162,000 square feet of office space in a new building in San Jose, California. The lease term began on January 1, 2019.

In connection with the lease, the Company procured a standby letter of credit (LOC) in the amount of $8.1 million for the benefit of the landlord, which may be drawn down in the event the Company defaults in the payment of its obligations under the lease. The LOC is disclosed as restricted cash on the Company's consolidated balance sheets for the year ending March 31, 2019.

On April 30, 2019, the Company entered into an assignment and assumption of lease agreement (the "Agreement") with the landlord and a third party lessee, to assign to the third party lessee its rights and obligations under the new office space lease. Pursuant to the Agreement, the Company expects to be released from all of its obligations under the lease and related LOC by the end of the Company’s fiscal year ending March 31, 2022 or shortly thereafter.

At March 31, 2019, future total minimum annual lease payments under non-cancelable operating leases were as follows (in thousands):



Year ending March 31:
2020	$	7,143
2021	8,907
2022	8,797
2023	1,556
2024	1,140
Thereafter	2,279
Total	$	29,822

Rent expense for the years ended March 31, 2019, 2018 and 2017 was $10.6 million, $5.6 million and $5.1 million, respectively.

Capital Leases

The Company has non-cancelable capital lease agreements for office and computer equipment bearing interest at various rates. At March 31, 2019, future minimum annual lease payments under non-cancelable capital leases were as follows (in thousands):



Year ending March 31:
2020	$	436
2021	64
2022	19
2023	15
2024	15
Total minimum payments	549
Less: Amount representing interest	(15		)
	534
Less: Short-term portion of capital lease obligations	(424		)
Long-term portion of capital lease obligations	$	110

Capital leases included in computer and office equipment were approximately $3.4 million and $3.5 million at March 31, 2019 and 2018, respectively. Total accumulated amortization was approximately $2.8 million and $1.8 million at March 31, 2019 and 2018, respectively.

Minimum Third-Party Customer Support Commitments

The Company's contract with third-party customer support vendors include minimum monthly commitments and the requirements to maintain the service level for several months. The total contractual minimum commitments were approximately $1.1 million at March 31, 2019.

Minimum Third-Party Network Service Provider Commitments

The Company entered into contracts with multiple vendors for third-party network service which expire on various dates through fiscal 2021. At March 31, 2019, future minimum annual payments under these third-party network service contracts were approximately $1.9 million.

Legal Proceedings

The Company may be involved in various lawsuits, claims and proceedings, including intellectual property, commercial, securities and employment matters that arise in the normal course of business. The Company accrues a liability when management believes information available prior to the issuance of the financial statements indicates it is probable a loss has been incurred as of the date of the financial statements and the amount of loss can be reasonably estimated. The Company adjusts its accruals to reflect the impact of negotiations, settlements, rulings, advice of legal counsel and other information and events pertaining to a particular case. Legal costs are expensed as incurred.

On November 30, 2018, the Company was named as a defendant in Rainey Circuit LLC v. 8x8 Inc., by way of a Complaint filed by Plaintiff Rainey Circuit LLC in the District of Delaware (Civil Action No. Case 1:18-cv-01903-MN, the Complaint). The Complaint alleges that the Company infringes U.S. Patent No. 8,131,824 with regards to alleged activities concerning the Company's sales or uses of a multimedia messaging system as allegedly implemented in connection with the Company’s Virtual Office application. The Company has a membership with a defensive patent acquisition network (third-party). The third-party negotiated a license covering the Company, and on February 26, 2019, Rainey Circuit LLC dismissed the Complaint against the Company with prejudice.

The Company believes it has recorded adequate provisions for any such lawsuits, claims and proceedings and, as of March 31, 2019, it was not reasonably possible that a material loss had been incurred in excess of the amounts recognized in the Consolidated Financial Statements. Based on its experience, the Company believes that damage amounts claimed in these matters are not meaningful indicators of potential liability. Some of the matters pending against the Company involve potential compensatory, punitive or treble damage claims or sanctions, that, if granted, could require the Company to pay damages or make other expenditures in amounts that could have a material adverse effect on its Consolidated Financial Statements. Given the inherent uncertainties of litigation, the ultimate outcome of the ongoing matters described herein cannot be predicted with certainty. While litigation is inherently unpredictable, the Company believes it has valid defenses with respect to the legal matters pending against it. Nevertheless, the Consolidated Financial Statements could be materially adversely affected in a particular period by the resolution of one or more of these contingencies.

State and Local Taxes and Surcharges

From time to time, the Company has received inquiries from a number of state and local taxing agencies with respect to the remittance of sales, use, telecommunications, excise, and income taxes. Several jurisdictions currently are conducting tax audits of the Company's records. The Company collects or has accrued for taxes that it believes are required to be remitted. The amounts that have been remitted have historically been within the accruals established by the Company. The Company adjusts its accrual when facts relating to specific exposures warrant such adjustment. During the second quarter of fiscal 2019, the Company conducted a periodic review of the taxability of its services and determined that certain services may be subject to sales, use, telecommunications or other similar indirect taxes in certain jurisdictions. Accordingly, the Company recorded contingent indirect tax liabilities. As of March 31, 2019 and 2018, the Company had accrued contingent indirect tax liabilities of $8.0 million and $0.8 million, respectively.

Other Commitments, Indemnifications and Contingencies

During the year ended March, 31, 2019, the Company determined that additional sales taxes were probable of being assessed and estimable in multiple states as a result of preliminary findings from current sales and use tax audits. As a result, the Company estimated an incremental sales tax liability of $7.2 million, which was recorded as general and administrative expense in the consolidated statements of operations during fiscal 2019.

CONVERTIBLE SENIOR NOTES AND CAPPED CALL

12 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

CONVERTIBLE SENIOR NOTES AND CAPPED CALL

Convertible Senior Notes

In February 2019, the Company issued $287.5 million aggregate principal amount of 0.50% convertible senior notes (the Notes) due 2024 in a private placement, including the exercise in full of the initial purchasers' option to purchase additional notes. The Notes are senior unsecured obligations of the Company and interest is payable semiannually in arrears on February 1 and August 1 of each year, beginning on August 1, 2019. The Notes will mature on February 1, 2024, unless earlier repurchased, redeemed, or converted. The total net proceeds from the debt offering, after deducting initial purchase discounts, debt issuance costs, and costs of the capped call transactions described below, were approximately $245.8 million.

Each $1,000 principal amount of the Notes is initially convertible into 38.9484 shares of the Company’s common stock, par value $0.001, which is equivalent to an initial conversion price of approximately $25.68 per share. The conversion rate is subject to adjustment upon the occurrence of certain specified events but will not be adjusted for any accrued and unpaid interest. In addition, upon the occurrence of certain corporate events that occur prior to the maturity date or following the Company's issuance of a notice of redemption , in each case as described in the Indenture, the Company will, in certain circumstances, increase the conversion rate for a holder that elects to convert its Notes in connection with such a corporate event or during the relevant redemption period.

Prior to the close of business on the business day immediately preceding October 1, 2023, the Notes will be convertible only under the following circumstances:

At any time during any calendar quarter commencing after the fiscal quarter ending on June 30, 2019 (and only during such calendar quarter), if the last reported sale price of the Common Stock for at least 20 trading days (whether or not consecutive) during the period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day;


2.	During the five business day period immediately after any ten consecutive trading day period (the measurement period), if the trading price per $1,000 principal amount of the Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the common stock on each such trading day and the conversion rate on each such trading day;


3.	If the Company calls any or all of the Notes for redemption, at any time prior to the close of business on the scheduled trading day immediately preceding the redemption date; or


4.	Upon the occurrence of specified corporate events (as set forth in the indenture governing the Notes).

On or after October 1, 2023, until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert all or any portion of their Notes, regardless of the foregoing circumstances. Upon conversion, the Company will satisfy its conversion obligation by paying or delivering, as the case may be, cash, shares of common stock, or a combination of cash and shares of common stock, at the Company's election. The Company’s current intent is to settle the principal amount of the Notes in cash upon conversion. During the year ended March 31, 2019, the conditions allowing holders of the Notes to convert were not met.

The Company may not redeem the Notes prior to February 4, 2022. On or after February 4, 2022, the Company may redeem for cash all or part of the Notes, at the redemption price equal to 100% of the principal amount thereof, plus accrued and unpaid interest, if the last reported sale price of the common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period (including the last trading day of such period) ending on, and including, the trading day immediately preceding the date on which the Company provides a redemption notice. If a fundamental change (as defined in the indenture governing the notes) occurs at any time, holders of Notes may require the Company to repurchase for cash all or any portion of their Notes at a repurchase price equal to 100% of the principal amount of the Notes to be repurchased, plus accrued and unpaid interest to, but excluding, the fundamental change repurchase date.

The Notes are senior unsecured obligations and will rank senior in right of payment to any of the Company’s indebtedness that is expressly subordinated in right of payment to the Notes; equal in right of payment with the Company’s existing and future liabilities that are not so subordinated; effectively junior in right of payment to any of the Company’s secured indebtedness to the extent of the value of the assets securing such indebtedness; and structurally junior to all indebtedness and other liabilities (including trade payables) of current or future subsidiaries of the Company.

In accounting for the issuance of the Notes, the Company separated the Notes into liability and equity components. The carrying amount of the liability component was calculated by measuring the fair value of a similar debt instrument that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option was $66.7 million and was determined by deducting the fair value of the liability component from the par value of the Notes. The equity component is not remeasured as long as it continues to meet the accounting requirements for equity classification. The excess of the principal amount of the liability component over its carrying amount (“debt discount”) is amortized to interest expense at the effective interest rate of 6.5% over the contractual terms of the Notes.

In accounting for the transaction costs related to the Notes, the Company allocated the total amount incurred to the liability and equity components of the Notes based on the proportion of the proceeds allocated to the debt and equity components. Issuance costs attributable to the liability component were $0.6 million were recorded as additional debt discount to be amortized to interest expense using the effective interest method over the contractual terms of the Notes. Issuance costs attributable to the equity component were netted with the equity component in stockholders’ equity.

The net carrying amount of the liability component of the Notes was as follows (in thousands):



	March 31, 2019
Principal	$	287,500
Unamortized debt discount	(70,876		)
Unamortized issuance costs	(589		)
Net carrying amount	$	216,035

The net carrying amount of the equity component of the Notes was as follows (in thousands):



	March 31, 2019
Debt discount for conversion option	$	66,700
Issuance costs	(1,848		)
Net carrying amount	$	64,852

Interest expense related to the Notes was as follows (in thousands):



	March 31, 2019
Contractual interest expense	$	156
Amortization of debt discount	1,343
Amortization of issuance costs	11
Total interest expense	$	1,510

Capped Call

In connection with the pricing of the Notes, the Company entered into privately negotiated capped call transactions (Capped Calls) with certain counterparties. The Capped Calls each have an initial strike price of approximately $25.68 per share, subject to certain adjustments, which corresponds to the initial conversion price of the Notes. The Capped Calls have initial cap prices of $39.50 per share, subject to certain adjustments. The Capped Calls are expected to partially offset the potential dilution to the Company’s Common Stock upon any conversion of the Notes, with such offset subject to a cap based on the cap price. The Capped Calls cover, subject to anti-dilution adjustments, approximately 11.2 million shares of the Company’s Common Stock. The Capped Calls are subject to adjustment upon the occurrence of specified extraordinary events affecting the Company, including merger events, tender offers and announcement events. In addition, the Capped Calls are subject to certain specified additional disruption events that may give rise to a termination of the Capped Calls, including nationalization, insolvency or delisting, changes in law, failures to deliver, insolvency filings and hedging disruptions. For accounting purposes, the Capped Calls are separate transactions, and not part of the terms of the Notes. As these transactions meet certain accounting criteria, the Capped Calls are recorded in stockholders' equity and are not accounted for as derivatives. The cost of $33.7 million incurred to purchase the Capped Calls was recorded as a reduction to additional paid-in capital and will not be remeasured.

The net impact to the Company’s stockholders’ equity, included in additional paid-in capital, relating to the issuance of the Notes was as follows (in thousands):



	March 31, 2019
Conversion option	$	66,700
Payments for capped call transactions	(33,724		)
Issuance costs	(1,848		)
Total	31,128

STOCKHOLDERS' EQUITY

12 Months Ended

Mar. 31, 2019

Equity [Abstract]

STOCKHOLDERS' EQUITY

In May 2006, the Company's board of directors approved the 2006 Stock Plan ("2006 Plan"). The Company's stockholders subsequently adopted the 2006 Plan in September 2006, and became effective in October 2006. The Company reserved 7,000,000 shares of the Company's common stock for issuance under this plan. The 2006 Plan provides for granting incentive stock options to employees and non-statutory stock options to employees, directors or consultants. The stock option price of incentive stock options granted may not be less than the fair market value on the effective date of the grant. Other types of options and awards under the 2006 Plan may be granted at any price approved by the administrator, which generally will be the compensation committee of the board of directors. Options generally vest over four years and expire ten years after grant. In 2009, the 2006 Plan was amended to provide for the granting of stock purchase rights. The 2006 Plan expired in May 2016. As of March 31, 2019, there are no shares available for future grants under the 2006 Plan.

2012 Equity Incentive Plan

In June 2012, the Company's board of directors approved the 2012 Equity Incentive Plan ("2012 Plan"). The Company's stockholders subsequently adopted the 2012 Plan in July 2012, and became effective in August 2012. The Company reserved 4,100,000 shares of the Company's common stock for issuance under this plan. In August 2014, 2016 and 2018, the 2012 Plan was amended to allow for an additional 6,800,000 , 4,500,000 and 16,300,000 shares reserved for issuance, respectively. The 2012 Plan provides for granting incentive stock options to employees and non-statutory stock options to employees, directors or consultants, and granting of stock appreciation rights, restricted stock, restricted stock units and performance units, qualified performance-based awards and stock grants. The stock option price of incentive stock options granted may not be less than the fair market value on the effective date of the grant. Other types of options and awards under the 2012 Plan may be granted at any price approved by the administrator, which generally will be the compensation committee of the board of directors. Options, restricted stock and restricted stock units generally vest over four years and expire ten years after grant. The 2012 Plan expires in June 2022. As of March 31, 2019, 10.7 million shares remained available under the 2012 Plan.

2013 New Employee Inducement Incentive Plan

In September 2013, the Company's board of directors approved the 2013 New Employee Inducement Incentive Plan ("2013 Plan"). The Company reserved 1,000,000 shares of the Company's common stock for issuance under this plan. In November 2014, the 2013 Plan was amended to allow for an additional 1,200,000 shares reserved for issuance. In July 2015, the Plan was amended to allow for an additional 1,200,000 shares reserved for issuance. In connection with its approval of the August 2016 amendments to the 2012 Plan, the Board of Directors has approved the suspension of future grants under the 2013 Plan, which became effective immediately upon stockholder approval of the proposed 2012 Plan amendments in August 2016. In addition, the 2013 Plan was amended to reduce the number of shares reserved for issuance under the 2013 Plan to the number of shares that are then subject to outstanding awards under the 2013 Plan, leaving no shares available for future grant. The 2013 Plan provided for granting non-statutory stock options, stock appreciation rights, restricted stock, restricted stock and performance units and stock grants solely to newly hired employees as a material inducement to accepting employment with the Company. Options were granted at market value on the grant date under the 2013 Plan, unless determined otherwise at the time of grant by the administrator, which generally will be the compensation committee of the board of directors. Grants generally vest over four years and expire ten years after grant.

2017 New Employee Inducement Incentive Plan

In October 2017, the Company's board of directors approved the 2017 New Employee Inducement Incentive Plan ("2017 Plan"). The Company reserved 1,000,000 shares of the Company's common stock for issuance under this plan. In January and June 2018 , the 2017 Plan was amended to allow for an additional 1,500,000 and 1,500,000 shares reserved for issuance, respectively. The 2017 Plan provides for granting non-statutory stock options, stock appreciation rights, restricted stock, and performance units and stock grants solely to newly hired employees as a material inducement to accepting employment with the Company. Options are granted at market value on the grant date under the 2017 Plan, unless determined otherwise at the time of grant by the administrator, which generally will be the compensation committee of the board of directors. Grants generally vest over three years and expire ten years after grant. As of March 31, 2019, 0.6 million shares remained available under the 2017 plan.

Stock-Based Compensation

The following table summarizes stock-based compensation expense (as reclassified, see Note 14, in thousands):



	Years Ended March 31,
	2019		2018		2017
Cost of service revenue	$	5,527	$	3,977	$	3,308
Cost of product revenue	—		—		—
Research and development	12,313		6,625		3,762
Sales and marketing	11,951		6,630		5,334
General and administrative	14,717		11,944		9,058
Total	$	44,508	$	29,176	$	21,462

Stock Options, Stock Purchase Right and Restricted Stock Unit Activity

Stock option activity under all the Company's stock option plans since March 31, 2016, is summarized as follows:



	Number of Shares		Weighted Average Exercise Price Per Share
Outstanding at March 31, 2016	4,793,266		$	6.29
Granted	407,392		14.63
Exercised	(603,998	)	2.34
Canceled/Forfeited	(134,248	)	8.41
Outstanding at March 31, 2017	4,462,412		7.52
Granted	609,135		14.95
Exercised	(773,897	)	3.95
Canceled/Forfeited	(299,365	)	13.05
Outstanding at March 31, 2018	3,998,285		8.93
Granted	236,799		21.65
Exercised	(759,884	)	7.70
Canceled/Forfeited	(361,129	)	15.41
Outstanding at March 31, 2019	3,114,071		$	9.45

Vested and expected to vest March 31, 2019	3,114,071		$	9.45
Exercisable at March 31, 2019	2,737,032		$	8.33

Stock Purchase Right activity since March 31, 2016 is summarized as follows:



	Number of Shares		Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Term (in Years)
Balance at March 31, 2016	82,171		$	6.30	0.76
Granted	—		—
Vested and released	(69,426	)	6.00
Forfeited	(1,375	)	6.72
Balance at March 31, 2017	11,370		8.10		1.09
Granted	—		—
Vested and released	(6,395	)	8.26
Forfeited	—		—
Balance at March 31, 2018	4,975		8.10		1.09
Granted	—		—
Vested and released	(4,625	)	7.88
Forfeited	(350	)	7.88
Balance at March 31, 2019	—		$	—

Restricted stock unit activity since March 31, 2016 is summarized as follows:



	Number of Shares		Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Term (in Years)
Balance at March 31, 2016	4,544,799		$	8.08	1.67
Granted	2,491,877		15.15
Vested and released	(1,600,831	)	7.89
Forfeited	(496,795	)	9.56
Balance at March 31, 2017	4,939,050		11.57		1.55
Granted	3,481,870		14.41
Vested and released	(1,833,038	)	10.27
Forfeited	(652,339	)	12.73
Balance at March 31, 2018	5,935,543		13.51		1.60
Granted	5,726,787		19.77
Vested and released	(2,399,371	)	12.87
Forfeited	(1,442,471	)	16.85
Balance at March 31, 2019	7,820,488		$	17.68	1.35

The total intrinsic value of options exercised in the years ended March 31, 2019, 2018 and 2017 was $10.0 million, $9.0 million and $7.2 million, respectively. As of March 31, 2019, there was $107 million of unamortized stock-based compensation expense related to unvested stock options and awards which is expected to be recognized over a weighted average period of approximately 2.3 years.

1996 Employee Stock Purchase Plan

The Company's 1996 Stock Purchase Plan ("Employee Stock Purchase Plan") was adopted in June 1996 and became effective upon the closing of the Company's initial public offering in July 1997. Under the Employee Stock Purchase Plan, 500,000 shares of common stock were initially reserved for issuance. At the start of each fiscal year, the number of shares of common stock subject to the Employee Stock Purchase Plan increases so that 500,000 shares remain available for issuance. In May 2006, the Company's board of directors approved a ten-year extension of the Employee Stock Purchase Plan. Stockholders approved a ten-year extension of the Employee Stock Purchase Plan at the 2006 Annual Meeting of Stockholders held September 18, 2006. The Board of Directors approved a second ten-year extension in May 2017. Stockholders approved the second ten-year extension in August 2017. As a result of these extensions, the Employee Stock Purchase Plan is effective until August 2027. During fiscal 2019, 2018 and 2017, approximately $0.5 million, $0.4 million and $0.3 million shares, respectively, were issued under the Employee Stock Purchase Plan.

The Employee Stock Purchase Plan permits eligible employees to purchase common stock through payroll deductions at a price equal to 85% of the fair market value of the common stock at the beginning of each two-year offering period or the end of a six month purchase period, whichever is lower. When the Employee Stock Purchase Plan was reinstated in fiscal 2005, the offering period was reduced from two years to one year. The contribution amount may not exceed ten percent of an employee's base compensation, including commissions, but not including bonuses and overtime. In the event of a merger of the Company with or into another corporation or the sale of all or substantially all of the assets of the Company, the Employee Stock Purchase Plan provides that a new exercise date will be set for each purchase right under the plan which exercise date will occur before the date of the merger or asset sale.

As of March 31, 2019, there was approximately $1.8 million of total unrecognized compensation cost related to employee stock purchases. This cost is expected to be recognized over a weighted average period of 0.6 years.

Assumptions Used to Calculate Stock-Based Compensation Expense

The fair value of each of the Company's option grants has been estimated on the date of grant using the Black-Scholes pricing model with the following assumptions:



	Years Ended March 31,
	2019			2018			2017
Expected volatility	41		%	41		%	44		%
Expected dividend yield	—			—			—
Risk-free interest rate	2.5% to 3.0%			1.8% to 2.4%			1.1% to 2.2%
Weighted average expected term (in years)	4.5 years			4.8 years			4.9 years

Weighted average fair value of options granted	$	8.19		$	5.70		$	5.74

The estimated fair value of stock purchase rights granted under the Employee Stock Purchase Plan was estimated using the Black-Scholes pricing model with the following weighted-average assumptions:



	Years Ended March 31,
	2019			2018			2017
Expected volatility	41		%	40		%	37		%
Expected dividend yield	—			—			—
Risk-free interest rate	2.43		%	1.33		%	0.65		%
Weighted average expected term (in years)	0.8 years			0.8 years			0.8 years

Weighted average fair value of rights granted	$	5.74		$	4.10		$	4.19

Stock Repurchases

In October 2015, the Company's board of directors authorized the Company to purchase an additional $15.0 million of its common stock from time to time until October 20, 2016 under the 2015 Repurchase Plan. The plan expired in October 2016 with an unused authorized repurchase amount of $15.0 million.

In May 2017, the Company's board of directors authorized the Company to purchase $25.0 million of its common stock from time to time under the 2017 Repurchase Plan (the "2017 Plan"). The 2017 Plan expires when the maximum purchase amount is reached, or upon the earlier revocation or termination by the board of directors. The remaining amount available under the 2017 Plan at March 31, 2019 was approximately $7.1 million.

INCOME TAXES

12 Months Ended

Mar. 31, 2019

Income Tax Disclosure [Abstract]

INCOME TAXES

The Tax Cuts and Jobs Act ("Tax Act") was enacted on December 22, 2017. Among numerous provisions, the Tax Act reduces the U.S. federal corporate tax rate from 35% to 21%, requires companies to pay a one-time transition tax on earnings of certain foreign subsidiaries that were previously tax deferred, and creates new taxes on certain foreign sourced earnings.

The Company remeasured certain deferred tax assets and liabilities based on the rates at which they are expected to reverse in the future, which is generally 21%. Accordingly, deferred tax assets were adjusted down by about $23 million in the period ended December 31, 2017. However, because the Company recorded a full valuation allowance during the year ended December 31, 2018, the decrease in deferred tax assets from the tax rate change was fully offset by a corresponding decrease in valuation allowance, and therefore, resulted in no impact to the tax expense.

The one-time transition tax is based on the Company's total post-1986 earnings and profits for which U.S. income taxes have been previously deferred. The Company recorded no one-time transition tax liability for its foreign subsidiaries as the Company's calculations concluded it does not have any untaxed foreign accumulated earnings as of the measurement date. The Company has made an accounting policy election to treat Global Intangible Low-Taxed Income (“GILTI”) as a current period cost.

In response to the Tax Act, the SEC staff issued guidance on accounting for the tax effects of the Tax Act. The guidance provides a one-year measurement period for companies to complete the accounting. As of March 31, 2019, the Company has completed its analysis and recorded no adjustments.

For the years ended March 31, 2019, 2018 and 2017, the Company recorded a provision (benefit) for income taxes of approximately $0.6 million, $66.3 million, and $(0.1) million, respectively. The components of the consolidated provision (benefit) for income taxes for fiscal 2019, 2018 and 2017 consisted of the following (in thousands):



	March 31,
Current:	2019		2018			2017
Federal	$	—	$	(395	)	$	(7	)
State	291		256			588
Foreign	278		185			112
Total current tax provision	569		46			693
Deferred
Federal	—		59,837			1,506
State	—		6,664			(1,095		)
Foreign	—		(253		)	(1,230		)
Total deferred tax provision (benefit)	—		66,248			(819		)
Income tax provision (benefit)	$	569	$	66,294		$	(126	)

The Company's income (loss) from continuing operations before income taxes included $0.2 million, $(19.7) million, and $(8.4) million of foreign subsidiary income (loss) for the fiscal years ended March 31, 2019, 2018 and 2017, respectively. The Company is permanently reinvesting the earnings of its profitable foreign subsidiaries. The Company intends to reinvest these profits in expansion of overseas operations. If the Company were to remit these earnings, the tax impact would be immaterial.

Deferred tax assets and (liabilities) were comprised of the following (in thousands):



	March 31,
	2019			2018
Deferred tax assets
Net operating loss carryforwards	$	61,740		$	40,465
Research and development and other credit carryforwards	15,573			11,761
Stock-based compensation	9,006			6,389
Reserves and allowances	5,697			3,181
Fixed assets and intangibles	2,709			378
Gross deferred tax assets	94,725			62,174
Valuation allowance	(65,948		)	(62,174		)
Total deferred tax assets	28,777			$	—
Deferred tax liabilities
Deferred sales commissions	(12,221		)	—
Convertible debt	(16,556		)	—
Net deferred taxes	$	—		$	—

The Company assesses the realizability of deferred tax assets based on the available evidence, including a history of taxable income and estimates of future taxable income. In assessing the realizability of deferred tax assets, The Company considers whether it is more likely than not that all or some portion of deferred tax assets will not be realized. For the year ended March 31, 2019, the Company continues to maintain a full valuation allowance against its deferred tax assets as it considered the cumulative losses in recent periods to be a substantial negative evidence. At March 31, 2019, management determined that a valuation allowance of approximately $65.9 million was needed compared with approximately $62.2 million as of March 31, 2018.

At March 31, 2019, the Company had federal net operating loss carryforwards related to fiscal year 2019 of approximately $88.6 million, which carryforward indefinitely, and had carry-forwards related to prior years of $156.4 million, which begin to expire in 2021. At March 31, 2019, the Company has state net operating loss carry-forwards of $80.0 million, which expire at various dates between 2029 and 2037. In addition, at March 31, 2019, the Company had research and development credit carryforwards for federal and California tax reporting purposes of approximately $10.1 million and $11.5 million, respectively. The federal income tax credit carryforwards will expire at various dates between 2021 and 2038, while the California income tax credits will carry forward indefinitely. A reconciliation of the Company's provision (benefit) for income taxes to the amounts computed using the statutory U.S. federal income tax rate is as follows (in thousands):



	Years Ended March 31,
	2019			2018			2017
Tax benefit at statutory rate	$	(18,441	)	$	(11,790	)	$	(1,652	)
State income taxes before valuation allowance, net of federal effect	(3,612		)	(1,042		)	108
Foreign tax rate differential	71			(1,188		)	885
Research and development credits	(3,744		)	(2,189		)	(1,484		)
Change in valuation allowance	30,558			56,663			(287		)
Compensation/option differences	(7,277		)	(4,965		)	(246		)
Non-deductible compensation	1,200			1,132			1,079
Tax Act rate change impact	—			22,630			—
Acquisition costs	—			—			54
Foreign loss not benefited	159			6,847			780
Other	1,655			196			637
Total income tax provision (benefit)	$	569		$	66,294		$	(126	)

For March 31, 2019, the statutory federal rate of 21% was used. For fiscal year ended March 31, 2018, a blended statutory U.S. federal income tax rate of 34% for 9 months and 21% for 3 months was used. For the year ended March, 31, 2017 a U.S. federal income tax rate of 34% was used.

The Company recognizes the tax benefit from uncertain tax positions if it is more likely than not that the tax positions will be sustained on examination by the tax authorities, based on the technical merits of the position. The tax benefit is measured based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement. A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):



	Unrecognized Tax Benefits
	2019		2018		2017
Balance at beginning of year	$	3,980	$	3,331	$	2,881
Gross increases - tax position in prior period	17		—		—
Gross increases - tax position related to the current year	1,036		649		450
Balance at end of year	$	5,033	$	3,980	$	3,331

At March 31, 2019, the Company had a liability for unrecognized tax benefits of $5.0 million, all of which, if recognized, would favorably affect the company's effective tax rate. The Company does not expect its unrecognized tax benefits to change significantly over the next 12 months.

The Company's policy for recording interest and penalties associated with tax examinations is to record such items as a component of operating expense income before taxes. During the fiscal years ended March 31, 2019, 2018 and 2017, the Company did not recognize any interest or penalties related to unrecognized tax benefits.

Utilization of the Company's net operating loss and tax credit carryforwards can become subject to a substantial annual limitation due to the ownership change limitations provided by Section 382 of the Internal Revenue Code and similar state provisions. Such an annual limitation could result in the expiration or elimination of the net operating loss and tax credit carryforwards before utilization. The Company has performed an analysis of its changes in ownership under Section 382 of the Internal Revenue Code. The Company currently believes that the Section 382 limitation will not limit utilization of the carryforwards prior to their expiration, with the exception of certain acquired loss and tax credit carryforwards.

The Company files U.S. federal and state income tax returns in jurisdictions with varying statutes of limitations. The Company is currently under examination by the Illinois Department of Revenue for the fiscal years ended March 31, 2016 and 2017. The outcome of the ongoing examination is currently unknown. The tax years fiscal 2000 through fiscal 2019 generally remain subject to examination by federal and most state tax authorities.

NET INCOME (LOSS) PER SHARE

12 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

NET INCOME (LOSS) PER SHARE

The following is a reconciliation of the weighted average number of common shares outstanding used in calculating basic and diluted net income (loss) per share (in thousands, except share and per share data):



	Years Ended March 31,
	2019			2018			2017
Numerator:
Net loss available to common stockholders	$	(88,739	)	$	(104,497	)	$	(4,751	)

Denominator:
Denominator for basic and diluted calculation	94,533			92,017			90,340

Net loss per share - basic and diluted	$	(0.94	)	$	(1.14	)	$	(0.05	)

The following table summarizes the potentially dilutive common shares that were excluded from the calculation of diluted earnings per share because their inclusion would have been antidilutive (in thousands):



	Years Ended March 31,
	2019	2018	2017
Stock options	3,114	3,998	4,462
Restricted stock units	7,820	5,940	4,950
	10,934	9,938	9,412

GEOGRAPHICAL INFORMATION

12 Months Ended

Mar. 31, 2019

Segment Reporting [Abstract]

GEOGRAPHICAL INFORMATION

The following tables set forth the geographic information for each period (in thousands):



	Revenue for the years ended March 31,
	2019		2018		2017
Americas (principally US)	$	316,427	$	266,034	$	227,914
Europe (principally UK)	36,159		30,466		25,474
	$	352,586	$	296,500	$	253,388



	Property and Equipment
	March 31, 2019		March 31, 2018
Americas (principally US)	$	45,639	$	27,270
Europe (principally UK)	7,196		8,462
	$	52,835	$	35,732

ACQUISITIONS	12 Months Ended
ACQUISITIONS	Mar. 31, 2019
Business Combinations [Abstract]
ACQUISITIONS	ACQUISITIONS LeChat, Inc. On January 5, 2017, the Company entered into an Agreement and Plan of Merger (the "Agreement") with the preferred and common shareholders LeChat Inc. (LeChat) for the purchase of all the outstanding preferred and common shares of LeChat. The Company recorded the acquired developed technology as an identifiable intangible asset with an estimated useful life of two years. The fair value of the technology was based on estimates and assumptions made by management using a cost approach method. The intangible asset is amortized on a straight-line basis over two years. The excess of the consideration transferred over the aggregate fair value of the asset acquired was recorded as goodwill. The amount of goodwill recognized was primarily attributable to the expected contributions of the acquired assets to the overall corporate strategy in addition to the acquired workforce. LeChat did not contribute materially to revenue or net loss for the period of acquisition to March 31, 2019. Goodwill recognized upon acquisition is deductible for income tax purposes. MarianaIQ On April 12, 2018, the Company entered into an Asset Purchase Agreement with MarianaIQ Inc. (MarianaIQ) for the purchase of certain assets of MarianaIQ to strengthen the artificial intelligence and machine learning capabilities of the Company's X Series product suite. The Company recorded the acquired developed technology as an identifiable intangible asset with an estimated useful life of two years. The fair value of the technology was based on estimates and assumptions made by management using a cost approach method. The intangible asset is amortized on a straight-line basis over two years. The excess of the consideration transferred over the aggregate fair value of the asset acquired was recorded as goodwill. The amount of goodwill recognized was primarily attributable to the expected contributions of the acquired assets to the overall corporate strategy in addition to the acquired workforce. MarianaIQ did not contribute materially to revenue or net loss for the period of acquisition to March 31, 2019. Goodwill recognized upon acquisition is deductible for income tax purposes. Jitsi On October 29, 2018, the Company entered into an Asset Purchase Agreement with Atlassian Corporation PLC (Atlassian) through which the Company purchased certain assets from Atlassian relating to the Jitsi open source video communications technology (Jitsi). The Company intends to integrate Jitsi's video collaboration capabilities into the Company's technology platform to further enhance the Company's video and X Series platform offerings. The Company recorded the acquired developed technology as an identifiable intangible asset with an estimated useful life of two years. The fair value of the technology was based on estimates and assumptions made by management using a cost approach method. The intangible asset is amortized on a straight-line basis over two years. The excess of the consideration transferred over the aggregate fair value of the asset acquired was recorded as goodwill. The amount of goodwill recognized was primarily attributable to the expected contributions of the entity to the overall corporate strategy in addition to the acquired workforce. Jitsi did not contribute materially to revenue or net loss for the period of acquisition to March 31, 2019. Goodwill recognized upon acquisition is deductible for income tax purposes.

SUBSEQUENT EVENTS	12 Months Ended
SUBSEQUENT EVENTS	Mar. 31, 2019
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTS On April 30, 2019, Company entered into an assignment and assumption of lease agreement (the "Agreement") with CAP Phase I, a Delaware limited liability company (the "Landlord"), and Roku Inc., a Delaware corporation ("Roku"), to assign to Roku the lease executed between the Company and the Landlord on January 23, 2018 (the "Lease"). Pursuant to the Agreement, the Company expects to be released from all of its obligations under the Lease and related standby letter of credit by the end of the Company’s fiscal year ending March 31, 2022 or shortly thereafter.

RECLASSIFICATIONS

12 Months Ended

Mar. 31, 2019

Accounting Changes and Error Corrections [Abstract]

RECLASSIFICATIONS

The Company reclassified certain expenses on its Consolidated Statement of Operations effective for the fourth quarter of fiscal 2019. These expenses are related to servicing our customers, and include customer deployment, technical support, professional services and other costs, which have been reclassified from Sales & Marketing expense to Cost of Revenues, Research & Development expenses or General & Administrative expenses.

The Company believes these classifications provide additional clarity and insights into the Company’s go-to-market, demand generation and sales execution activities, and how the total Sales & Marketing spend drives revenue generation, in light of the recent strategic and organizational changes impacting the Company’s channel, marketing and support activities.

The reclassifications did not have any impact to the consolidated operating income (loss), net income (loss) or cash flows.

The revised Consolidated Statements of Operations three month periods ended June 30, 2016, 2017 and 2018, September 30, 2016, 2017 and 2018, December 31, 2016, 2017, and 2018, and March 31, 2017, 2018, and 2019 and for the twelve month periods ended March 31, 2017, 2018, and 2019 are as follows (in thousands):



													Twelve Months
	Three Months Ended (unaudited)												Ended
	June 30,			September 30,			December 31,			March 31,			March 31,
	2016			2016			2016			2017			2017
Pre-Reclassification
Total revenues	$	60,041		$	63,183		$	63,676		$	66,489		$	253,388
Cost of service revenue	10,235			10,837			10,526			10,803			42,400
Cost of product revenue	5,505			5,782			4,240			4,187			19,714
Research and development	6,710			6,505			7,094			7,142			27,452
Sales and marketing	31,691			33,691			35,667			38,228			139,277
General and administrative	6,801			6,747			7,852			9,814			31,214
Loss from operations	$	(901	)	$	(379	)	$	(1,703	)	$	(3,685	)	$	(6,669	)

Reclassifications
Total revenues	$	—		$	—		$	—		$	—		$	—
Cost of service revenue	7,466			6,675			6,759			7,276			28,176
Cost of product revenue	—			—			—			—			—
Research and development	471			330			368			378			1,547
Sales and marketing	(10,247		)	(9,363		)	(9,897		)	(10,877		)	(40,384		)
General and administrative	2,310			2,358			2,770			3,223			10,661
Loss from operations	$	—		$	—		$	—		$	—		$	—

Post-Reclassification
Total revenues	$	60,041		$	63,183		$	63,676		$	66,489		$	253,388
Cost of service revenue	17,701			17,512			17,285			18,079			70,576
Cost of product revenue	5,505			5,782			4,240			4,187			19,714
Research and development	7,181			6,835			7,462			7,520			28,999
Sales and marketing	21,444			24,328			25,770			27,351			98,893
General and administrative	9,111			9,105			10,622			13,037			41,875
Loss from operations	$	(901	)	$	(379	)	$	(1,703	)	$	(3,685	)	$	(6,669	)



													Twelve Months
	Three Months Ended (unaudited)												Ended
	June 30,			September 30,			December 31,			March 31,			March 31,
	2017			2017			2017			2018			2018
Pre-Reclassification
Total revenues	$	69,098		$	72,483		$	75,575		$	79,344		$	296,500
Cost of service revenue	11,662			12,757			12,318			13,952			50,689
Cost of product revenue	4,884			5,098			4,675			5,826			20,482
Research and development	7,943			8,311			8,527			10,016			34,797
Sales and marketing	41,110			41,163			48,830			52,940			184,044
General and administrative	8,956			9,616			10,003			10,340			38,915
Impairment of goodwill, intangible assets, and equipment	—			—			9,469			—			9,469
Loss from operations	$	(5,457	)	$	(4,462	)	$	(18,247	)	$	(13,730	)	$	(41,896	)

Reclassifications
Total revenues	$	—		$	—		$	—		$	—		$	—
Cost of service revenue	8,497			8,591			8,586			9,881			35,555
Cost of product revenue	—			—			—			—			—
Research and development	418			403			376			411			1,608
Sales and marketing	(12,650		)	(12,483		)	(12,448		)	(12,518		)	(50,099		)
General and administrative	3,735			3,489			3,486			2,226			12,936
Loss from operations	$	—		$	—		$	—		$	—		$	—

Post-Reclassification
Total revenues	$	69,098		$	72,483		$	75,575		$	79,344		$	296,500
Cost of service revenue	20,159			21,348			20,904			23,833			86,244
Cost of product revenue	4,884			5,098			4,675			5,826			20,482
Research and development	8,361			8,714			8,903			10,427			36,405
Sales and marketing	28,460			28,680			36,382			40,422			133,945
General and administrative	12,691			13,105			13,489			12,566			51,851
Impairment of goodwill, intangible assets, and equipment	—			—			9,469			—			9,469
Loss from operations	$	(5,457	)	$	(4,462	)	$	(18,247	)	$	(13,730	)	$	(41,896	)




	Three Months Ended (unaudited)												Twelve Months
	As Previously Reported												Ended
	June 30,			September 30,			December 31,			March 31,			March 31,
	2018			2018			2018			2019			2019
Pre-Reclassification
Total revenues	$	83,225		$	85,682		$	89,912		$	93,767		$	352,586
Cost of service revenue	15,079			15,866			17,043			17,672			65,660
Cost of product revenue	6,281			5,397			5,318			5,784			22,780
Research and development	13,110			13,933			16,876			17,815			61,734
Sales and marketing	53,305			55,930			60,717			64,610			234,562
General and administrative	11,433			16,543			14,196			16,666			58,838
Loss from operations	$	(15,983	)	$	(21,987	)	$	(24,238	)	$	(28,780	)	$	(90,988	)

Reclassifications
Total revenues	$	—		$	—		$	—		$	—		$	—
Cost of service revenue	9,470			10,336			10,589			11,137			41,532
Cost of product revenue	—			—			—			—			—
Research and development	(60		)	131			10			249			330
Sales and marketing	(12,810		)	(14,250		)	(14,441		)	(15,085		)	(56,586		)
General and administrative	3,400			3,783			3,842			3,699			14,724
Loss from operations	$	—		$	—		$	—		$	—		$	—

Post-Reclassification
Total revenues	$	83,225		$	85,682		$	89,912		$	93,767		$	352,586
Cost of service revenue	24,549			26,202			27,632			28,809			107,192
Cost of product revenue	6,281			5,397			5,318			5,784			22,780
Research and development	13,050			14,064			16,886			18,064			62,063
Sales and marketing	40,495			41,680			46,276			49,525			177,976
General and administrative	14,833			20,326			18,038			20,365			73,563
Loss from operations	$	(15,983	)	$	(21,987	)	$	(24,238	)	$	(28,780	)	$	(90,988	)

SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)

12 Months Ended

Mar. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)

In thousands, except per share data amounts:



	QUARTER ENDED
	March 31, 2019			December 31, 2018			September 30, 2018			June 30, 2018			March 31, 2018			December 31, 2017			September 30, 2017			June 30, 2017
Total revenues	$	93,767		$	89,912		85,682			$	83,225		$	79,344		$	75,575		$	72,483		$	69,098
Gross profit	59,174			56,962			54,083			52,395			49,685			49,996			46,037			44,055
Loss from operations	(28,780		)	(24,238		)	(21,987		)	(15,983		)	(13,730		)	(18,247		)	(4,462		)	(5,457		)
Net income (loss)	(28,131		)	(23,771		)	(21,482		)	(15,355		)	(13,262		)	(88,520		)	(546		)	(2,169		)
Net income (loss) per share:
Basic and diluted	$	(0.29	)	$	(0.25	)	$	(0.23	)	$	(0.16	)	$	(0.14	)	$	(0.96	)	$	(0.01	)	$	(0.02	)

SCHEUDLE II

12 Months Ended

Mar. 31, 2019

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

SCHEDULE II

VALUATION AND QUALIFYING ACCOUNTS

(in thousands)



Description	Balance at Beginning of Year		Additions Charged to Expenses		Deductions (a)			Balance at End of Year
Total Allowance for Doubtful Accounts:
Year ended March 31, 2017:	$	586	$	941	$	(573	)	$	954
Year ended March 31, 2018:	$	954	$	250	$	(300	)	$	904
Year ended March 31, 2019:	$	904	$	1,115	$	(1,155	)	$	864

(a) The deductions related to allowance for doubtful accounts represent accounts receivable which are written off.

THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES (Policies)

12 Months Ended

Mar. 31, 2019

Accounting Policies [Abstract]

The Company

8x8, Inc. ("8x8" or the "Company") was incorporated in California in February 1987 and was reincorporated in Delaware in December 1996.

Fiscal Period

Acquisitions

Principles of Consolidation

The consolidated financial statements include the accounts of 8x8 and its subsidiaries. All material intercompany accounts and transactions have been eliminated.

Reclassifications

Use of Estimates

Revenue Recognition

• Identification of the contract, or contracts, with a customer;

• Identification of the performance obligations in the contract;

• Determination of the transaction price;

• Allocation of the transaction price to the performance obligations in the contract; and

• Recognition of revenue when or as, the Company satisfies a performance obligation.

Judgments and Estimates

Service Revenue

Product Revenue

Contract Assets

Deferred Revenue

Deferred Sales Commission Costs

Practical Expedients

Cash, Cash Equivalents and Investments

The Company considers all highly liquid investments with an original maturity of three months or less to be cash equivalents.

Accounts Receivable Allowance

Property and Equipment

Construction in progress primarily relates to costs to acquire or internally develop software for internal use not fully completed as of March 31, 2019 and 2018.

Accounting for Long-Lived Assets

Goodwill and Other Intangible Assets


•	As of April 1, 2018, The Company's DXI operations no longer operated on a standalone basis and was integrated into the Company's existing United Kingdom operations, and


•	During the third fiscal quarter of 2019, the Company assessed it had only one Chief Operating Decision Maker, who reviewed financial results on a consolidated basis. See Note 11 for further discussion.

Convertible Senior Notes

Warranty Expense

Research, Development and Software Costs

Advertising Costs

Advertising costs are expensed as incurred

Foreign Currency Translation

Segment Information

Concentrations

Fair Values of Financial Instruments


•	Level 1 applies to assets or liabilities for which there are quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.

•


•	Level 3 applies to assets or liabilities for which fair value is derived from valuation techniques in which one or more significant inputs are unobservable, including the Company's own assumptions.

Accounting for Stock-Based Compensation

•

The Company issued PSUs to a group of executives with vesting that is contingent on both market performance and continued service during the fiscal year ended March 31, 2018:

•

Research and Development Costs

Comprehensive Income (Loss)

Net Income (Loss) Per Share

Deferred Rent

Recently Adopted Accounting Pronouncements, Recent Accounting Pronouncements

RECENTLY ADOPTED ACCOUNTING PRONOUNCEMENTS

The Company recognized the cumulative effect of initially applying ASC 606 as an adjustment to retained earnings in the consolidated balance sheet as of April 1, 2018 (in thousands).



	Balance at March 31, 2018			Adjustments Due to ASC 606		Balance at April 1, 2018
Current assets:
Deferred sales commission costs	$	—		$	11,234	$	11,234
Other current assets	$	10,040		$	1,725	$	11,765
Non-current assets:
Deferred sales commission costs	$	—		26,942		$	26,942
Stockholders' Equity
Accumulated deficit	$	(201,464	)	$	39,901	$	(161,563	)

The following tables summarize the impacts of ASC 606 adoption on the Company's financial statements for the periods ended March 31, 2019:

Selected Consolidated Balance Sheet Line Items (in thousands):



	March 31, 2019
	ASC 605			Adjustments		(As Reported) ASC 606
Current assets:
Deferred sales commission costs	$	—		$	15,601	$	15,601
Other current assets	$	9,410		$	5,717	$	15,127
Non-current assets:
Deferred sales commission costs	$	—		$	33,693	$	33,693
Stockholders' Equity
Accumulated deficit	$	(305,313	)	$	55,011	$	(250,302	)

Selected Consolidated Statement of Operations Line Items (in thousands, except per share amounts):



	Twelve Months Ended March 31, 2019
	ASC 605			Adjustments			(As Reported) ASC 606
Service revenue	$	335,671		$	(1,233	)	$	334,438
Product revenue	16,271			1,877			18,148
Total revenue	$	351,942		$	644		$	352,586
Operating expenses:
Sales and marketing	$	189,058		$	(11,082	)	$	177,976
Loss from operations	$	(102,714	)	$	11,726		$	(90,988	)
Net loss	$	(100,465	)	$	11,726		$	(88,739	)
Net loss per share:
Basic and Diluted	$	(1.06	)	$	0.12		$	(0.94	)

Selected Consolidated Statements of Cash Flows Line Items (in thousands):



	Twelve Months Ended March 31, 2019
	ASC 605			Adjustments			(As Reported) ASC 606
Net loss	$	(100,465	)	$	11,726		$	(88,739	)
Amortization of deferred sales commission costs	$	—		$	14,204		$	14,204
Deferred sales commission costs	$	—		$	(25,286	)	$	(25,286	)
Other current and non-current assets	$	(3,693	)	$	(644	)	$	(4,337	)
Net cash provided by operating activities	$	(14,868	)	$	—		$	(14,868	)

RECENT ACCOUNTING PRONOUNCEMENTS

Guarantees

Indemnifications

Product Warranties

The Company accrues for the estimated costs that may be incurred under its product warranties upon revenue recognition.

THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Mar. 31, 2019

Accounting Policies [Abstract]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles

The Company recognized the cumulative effect of initially applying ASC 606 as an adjustment to retained earnings in the consolidated balance sheet as of April 1, 2018 (in thousands).



	Balance at March 31, 2018			Adjustments Due to ASC 606		Balance at April 1, 2018
Current assets:
Deferred sales commission costs	$	—		$	11,234	$	11,234
Other current assets	$	10,040		$	1,725	$	11,765
Non-current assets:
Deferred sales commission costs	$	—		26,942		$	26,942
Stockholders' Equity
Accumulated deficit	$	(201,464	)	$	39,901	$	(161,563	)

The following tables summarize the impacts of ASC 606 adoption on the Company's financial statements for the periods ended March 31, 2019:

Selected Consolidated Balance Sheet Line Items (in thousands):



	March 31, 2019
	ASC 605			Adjustments		(As Reported) ASC 606
Current assets:
Deferred sales commission costs	$	—		$	15,601	$	15,601
Other current assets	$	9,410		$	5,717	$	15,127
Non-current assets:
Deferred sales commission costs	$	—		$	33,693	$	33,693
Stockholders' Equity
Accumulated deficit	$	(305,313	)	$	55,011	$	(250,302	)

Selected Consolidated Statement of Operations Line Items (in thousands, except per share amounts):



	Twelve Months Ended March 31, 2019
	ASC 605			Adjustments			(As Reported) ASC 606
Service revenue	$	335,671		$	(1,233	)	$	334,438
Product revenue	16,271			1,877			18,148
Total revenue	$	351,942		$	644		$	352,586
Operating expenses:
Sales and marketing	$	189,058		$	(11,082	)	$	177,976
Loss from operations	$	(102,714	)	$	11,726		$	(90,988	)
Net loss	$	(100,465	)	$	11,726		$	(88,739	)
Net loss per share:
Basic and Diluted	$	(1.06	)	$	0.12		$	(0.94	)

Selected Consolidated Statements of Cash Flows Line Items (in thousands):



	Twelve Months Ended March 31, 2019
	ASC 605			Adjustments			(As Reported) ASC 606
Net loss	$	(100,465	)	$	11,726		$	(88,739	)
Amortization of deferred sales commission costs	$	—		$	14,204		$	14,204
Deferred sales commission costs	$	—		$	(25,286	)	$	(25,286	)
Other current and non-current assets	$	(3,693	)	$	(644	)	$	(4,337	)
Net cash provided by operating activities	$	(14,868	)	$	—		$	(14,868	)

REVENUE RECOGNITION (Tables)

12 Months Ended

Mar. 31, 2019

Revenue from Contract with Customer [Abstract]

Contract Balances

The following table provides information about receivables, contract assets and deferred revenues from contracts with customers (in thousands):



	March 31, 2019
Accounts receivable, net	$	20,181
Other current assets	$	5,717
Deferred revenue - current	$	3,336
Deferred revenue - non-current	$	6

Changes in the contract assets and the deferred revenue balances during the twelve months ended March 31, 2019 are as follows (in thousands):



	April 1, 2018		March 31, 2019		$ Change
Other current assets	$	1,725	$	5,717	$	3,992
Deferred revenue	$	2,578	$	3,342	$	764

FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Fair Value Measurements, Recurring and Nonrecurring

Contractual maturities of investments as of March 31, 2019 are set forth below (in thousands):



	Estimated Fair Value
Due within one year	$	32,385
Due after one year	37,514
Total	$	69,899

Cash, cash equivalents and available-for-sale investments were (in thousands):



As of March 31, 2019	Amortized Costs		Gross Unrealized Gain		Gross Unrealized Loss			Estimated Fair Value		Cash and Cash Equivalents		Short-Term Investments
Cash	$	25,364	$	—	$	—		$	25,364	$	25,364	$	—
Level 1:
Money market funds	251,219		—		—			251,219		251,219		—
Subtotal	276,583		—		—			276,583		276,583		—
Level 2:
Corporate debt	46,516		51		(29		)	46,538		—		46,538
Municipal securities	5,511		17		—			5,528		—		5,528
Asset backed securities	13,596		9		(17		)	13,588		—		13,588
Agency bond	4,260		—		(15		)	4,245		—		4,245
Subtotal	69,883		77		(61		)	69,899		—		69,899
Total assets	$	346,466	$	77	$	(61	)	$	346,482	$	276,583	$	69,899



As of March 31, 2018	Amortized Costs		Gross Unrealized Gain		Gross Unrealized Loss			Estimated Fair Value		Cash and Cash Equivalents		Short-Term Investments
Cash	$	16,499	$	—	$	—		$	16,499	$	16,499	$	—
Level 1:
Money market funds	15,204		—		—			15,204		15,204		—
Subtotal	31,703		—		—			31,703		31,703		—
Level 2:
Commercial paper	13,254		—		(8		)	13,246		—		13,246
Corporate debt	70,631		6		(296		)	70,341		—		70,341
Asset backed securities	3,385		3		(1		)	3,387		—		3,387
Mortgage backed securities	27,063		1		(119		)	26,945		—		26,945
Agency bond	4,183		—		(35		)	4,148		—		4,148
Subtotal	121,013		10		(464		)	120,559		—		120,559
Total assets	$	152,716	$	10	$	(464	)	$	152,262	$	31,703	$	120,559

PROPERTY AND EQUIPMENT (Tables)

12 Months Ended

Mar. 31, 2019

Property, Plant and Equipment [Abstract]

Components of Property, Plant and Equipment

Property and equipment consisted of the following (in thousands):



	March 31,
	2019			2018
Computer equipment	$	34,706		$	29,761
Software development costs	39,131			20,144
Software licenses	9,713			8,663
Leasehold improvements	6,286			6,573
Furniture and fixtures	2,324			1,637
Construction in progress	10,071			2,394
	102,231			69,172
Less: accumulated depreciation and amortization	(49,396		)	(33,440		)
	$	52,835		$	35,732

INTANGIBLE ASSETS, GOODWILL AND OTHER ASSETS (Tables)

12 Months Ended

Mar. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Acquired Finite-Lived Intangible Assets by Major Class

The carrying value of intangible assets consisted of the following (in thousands):



	March 31, 2019							March 31, 2018
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Technology	$	25,702	$	(15,409	)	$	10,293	$	19,702	$	(10,535	)	$	9,167
Customer relationships	9,467		(8,080		)	1,387		9,776		(7,366		)	2,410
Trade names/domains	2,108		(2,108		)	—		2,108		(1,727		)	381
Total acquired identifiable intangible assets	$	37,372	$	(25,692	)	$	11,680	$	31,681	$	(19,723	)	$	11,958

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

At March 31, 2019, annual amortization of definite lived intangible assets, based upon existing intangible assets and current useful lives, is estimated to be the following (in thousands):



	Amount
2020	$	6,116
2021	3,569
2022	1,766
2023	229
Total	$	11,680

Schedule of Goodwill

The following table provides a summary of the changes in the carrying amounts of goodwill (in thousands):



	Total
Balance at March 31, 2017	46,136
Impairment loss	(8,036	)
Foreign currency translation	1,954
Balance at March 31, 2018	40,054
Balance at Additions due to acquisitions	500
Foreign currency translation	(860	)
Balance at March 31, 2019	39,694

COMMITMENTS AND CONTINGENCIES (Tables)

12 Months Ended

Mar. 31, 2019

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases

At March 31, 2019, future total minimum annual lease payments under non-cancelable operating leases were as follows (in thousands):



Year ending March 31:
2020	$	7,143
2021	8,907
2022	8,797
2023	1,556
2024	1,140
Thereafter	2,279
Total	$	29,822

Schedule of Future Minimum Lease Payments for Capital Leases

At March 31, 2019, future minimum annual lease payments under non-cancelable capital leases were as follows (in thousands):



Year ending March 31:
2020	$	436
2021	64
2022	19
2023	15
2024	15
Total minimum payments	549
Less: Amount representing interest	(15		)
	534
Less: Short-term portion of capital lease obligations	(424		)
Long-term portion of capital lease obligations	$	110

CONVERTIBLE SENIOR NOTES AND CAPPED CALL (Tables)

12 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

Convertible Debt

The net carrying amount of the liability component of the Notes was as follows (in thousands):



	March 31, 2019
Principal	$	287,500
Unamortized debt discount	(70,876		)
Unamortized issuance costs	(589		)
Net carrying amount	$	216,035

The net carrying amount of the equity component of the Notes was as follows (in thousands):



	March 31, 2019
Debt discount for conversion option	$	66,700
Issuance costs	(1,848		)
Net carrying amount	$	64,852

The net impact to the Company’s stockholders’ equity, included in additional paid-in capital, relating to the issuance of the Notes was as follows (in thousands):



	March 31, 2019
Conversion option	$	66,700
Payments for capped call transactions	(33,724		)
Issuance costs	(1,848		)
Total	31,128

Interest Income and Interest Expense Disclosure

Interest expense related to the Notes was as follows (in thousands):



	March 31, 2019
Contractual interest expense	$	156
Amortization of debt discount	1,343
Amortization of issuance costs	11
Total interest expense	$	1,510

STOCKHOLDERS' EQUITY (Tables)

12 Months Ended

Mar. 31, 2019

Equity [Abstract]

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

The following table summarizes stock-based compensation expense (as reclassified, see Note 14, in thousands):



	Years Ended March 31,
	2019		2018		2017
Cost of service revenue	$	5,527	$	3,977	$	3,308
Cost of product revenue	—		—		—
Research and development	12,313		6,625		3,762
Sales and marketing	11,951		6,630		5,334
General and administrative	14,717		11,944		9,058
Total	$	44,508	$	29,176	$	21,462

Disclosure Of Share-Based Compensation Arrangements By Share-Based Payment Award

Stock option activity under all the Company's stock option plans since March 31, 2016, is summarized as follows:



	Number of Shares		Weighted Average Exercise Price Per Share
Outstanding at March 31, 2016	4,793,266		$	6.29
Granted	407,392		14.63
Exercised	(603,998	)	2.34
Canceled/Forfeited	(134,248	)	8.41
Outstanding at March 31, 2017	4,462,412		7.52
Granted	609,135		14.95
Exercised	(773,897	)	3.95
Canceled/Forfeited	(299,365	)	13.05
Outstanding at March 31, 2018	3,998,285		8.93
Granted	236,799		21.65
Exercised	(759,884	)	7.70
Canceled/Forfeited	(361,129	)	15.41
Outstanding at March 31, 2019	3,114,071		$	9.45

Vested and expected to vest March 31, 2019	3,114,071		$	9.45
Exercisable at March 31, 2019	2,737,032		$	8.33

Stock Purchase Right activity since March 31, 2016 is summarized as follows:



	Number of Shares		Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Term (in Years)
Balance at March 31, 2016	82,171		$	6.30	0.76
Granted	—		—
Vested and released	(69,426	)	6.00
Forfeited	(1,375	)	6.72
Balance at March 31, 2017	11,370		8.10		1.09
Granted	—		—
Vested and released	(6,395	)	8.26
Forfeited	—		—
Balance at March 31, 2018	4,975		8.10		1.09
Granted	—		—
Vested and released	(4,625	)	7.88
Forfeited	(350	)	7.88
Balance at March 31, 2019	—		$	—

Restricted stock unit activity since March 31, 2016 is summarized as follows:



	Number of Shares		Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Term (in Years)
Balance at March 31, 2016	4,544,799		$	8.08	1.67
Granted	2,491,877		15.15
Vested and released	(1,600,831	)	7.89
Forfeited	(496,795	)	9.56
Balance at March 31, 2017	4,939,050		11.57		1.55
Granted	3,481,870		14.41
Vested and released	(1,833,038	)	10.27
Forfeited	(652,339	)	12.73
Balance at March 31, 2018	5,935,543		13.51		1.60
Granted	5,726,787		19.77
Vested and released	(2,399,371	)	12.87
Forfeited	(1,442,471	)	16.85
Balance at March 31, 2019	7,820,488		$	17.68	1.35

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The fair value of each of the Company's option grants has been estimated on the date of grant using the Black-Scholes pricing model with the following assumptions:



	Years Ended March 31,
	2019			2018			2017
Expected volatility	41		%	41		%	44		%
Expected dividend yield	—			—			—
Risk-free interest rate	2.5% to 3.0%			1.8% to 2.4%			1.1% to 2.2%
Weighted average expected term (in years)	4.5 years			4.8 years			4.9 years

Weighted average fair value of options granted	$	8.19		$	5.70		$	5.74

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions



	Years Ended March 31,
	2019			2018			2017
Expected volatility	41		%	41		%	44		%
Expected dividend yield	—			—			—
Risk-free interest rate	2.5% to 3.0%			1.8% to 2.4%			1.1% to 2.2%
Weighted average expected term (in years)	4.5 years			4.8 years			4.9 years

Weighted average fair value of options granted	$	8.19		$	5.70		$	5.74

The estimated fair value of stock purchase rights granted under the Employee Stock Purchase Plan was estimated using the Black-Scholes pricing model with the following weighted-average assumptions:



	Years Ended March 31,
	2019			2018			2017
Expected volatility	41		%	40		%	37		%
Expected dividend yield	—			—			—
Risk-free interest rate	2.43		%	1.33		%	0.65		%
Weighted average expected term (in years)	0.8 years			0.8 years			0.8 years

Weighted average fair value of rights granted	$	5.74		$	4.10		$	4.19

INCOME TAXES (Tables)

12 Months Ended

Mar. 31, 2019

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit)

The components of the consolidated provision (benefit) for income taxes for fiscal 2019, 2018 and 2017 consisted of the following (in thousands):



	March 31,
Current:	2019		2018			2017
Federal	$	—	$	(395	)	$	(7	)
State	291		256			588
Foreign	278		185			112
Total current tax provision	569		46			693
Deferred
Federal	—		59,837			1,506
State	—		6,664			(1,095		)
Foreign	—		(253		)	(1,230		)
Total deferred tax provision (benefit)	—		66,248			(819		)
Income tax provision (benefit)	$	569	$	66,294		$	(126	)

Schedule of Deferred Tax Assets and Liabilities

Deferred tax assets and (liabilities) were comprised of the following (in thousands):



	March 31,
	2019			2018
Deferred tax assets
Net operating loss carryforwards	$	61,740		$	40,465
Research and development and other credit carryforwards	15,573			11,761
Stock-based compensation	9,006			6,389
Reserves and allowances	5,697			3,181
Fixed assets and intangibles	2,709			378
Gross deferred tax assets	94,725			62,174
Valuation allowance	(65,948		)	(62,174		)
Total deferred tax assets	28,777			$	—
Deferred tax liabilities
Deferred sales commissions	(12,221		)	—
Convertible debt	(16,556		)	—
Net deferred taxes	$	—		$	—

Schedule of Effective Income Tax Rate Reconciliation

A reconciliation of the Company's provision (benefit) for income taxes to the amounts computed using the statutory U.S. federal income tax rate is as follows (in thousands):



	Years Ended March 31,
	2019			2018			2017
Tax benefit at statutory rate	$	(18,441	)	$	(11,790	)	$	(1,652	)
State income taxes before valuation allowance, net of federal effect	(3,612		)	(1,042		)	108
Foreign tax rate differential	71			(1,188		)	885
Research and development credits	(3,744		)	(2,189		)	(1,484		)
Change in valuation allowance	30,558			56,663			(287		)
Compensation/option differences	(7,277		)	(4,965		)	(246		)
Non-deductible compensation	1,200			1,132			1,079
Tax Act rate change impact	—			22,630			—
Acquisition costs	—			—			54
Foreign loss not benefited	159			6,847			780
Other	1,655			196			637
Total income tax provision (benefit)	$	569		$	66,294		$	(126	)

Summary of Income Tax Contingencies

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):



	Unrecognized Tax Benefits
	2019		2018		2017
Balance at beginning of year	$	3,980	$	3,331	$	2,881
Gross increases - tax position in prior period	17		—		—
Gross increases - tax position related to the current year	1,036		649		450
Balance at end of year	$	5,033	$	3,980	$	3,331

NET INCOME (LOSS) PER SHARE (Tables)

12 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Net Income Per Share



	Years Ended March 31,
	2019			2018			2017
Numerator:
Net loss available to common stockholders	$	(88,739	)	$	(104,497	)	$	(4,751	)

Denominator:
Denominator for basic and diluted calculation	94,533			92,017			90,340

Net loss per share - basic and diluted	$	(0.94	)	$	(1.14	)	$	(0.05	)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share



	Years Ended March 31,
	2019	2018	2017
Stock options	3,114	3,998	4,462
Restricted stock units	7,820	5,940	4,950
	10,934	9,938	9,412

GEOGRAPHICAL INFORMATION (Tables)

12 Months Ended

Mar. 31, 2019

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

The following tables set forth the geographic information for each period (in thousands):



	Revenue for the years ended March 31,
	2019		2018		2017
Americas (principally US)	$	316,427	$	266,034	$	227,914
Europe (principally UK)	36,159		30,466		25,474
	$	352,586	$	296,500	$	253,388

Long-lived Assets by Geographic Areas



	Property and Equipment
	March 31, 2019		March 31, 2018
Americas (principally US)	$	45,639	$	27,270
Europe (principally UK)	7,196		8,462
	$	52,835	$	35,732

RECLASSIFICATIONS (Tables)

12 Months Ended

Mar. 31, 2019

Accounting Changes and Error Corrections [Abstract]

Schedule of Error Corrections and Prior Period Adjustments



													Twelve Months
	Three Months Ended (unaudited)												Ended
	June 30,			September 30,			December 31,			March 31,			March 31,
	2016			2016			2016			2017			2017
Pre-Reclassification
Total revenues	$	60,041		$	63,183		$	63,676		$	66,489		$	253,388
Cost of service revenue	10,235			10,837			10,526			10,803			42,400
Cost of product revenue	5,505			5,782			4,240			4,187			19,714
Research and development	6,710			6,505			7,094			7,142			27,452
Sales and marketing	31,691			33,691			35,667			38,228			139,277
General and administrative	6,801			6,747			7,852			9,814			31,214
Loss from operations	$	(901	)	$	(379	)	$	(1,703	)	$	(3,685	)	$	(6,669	)

Reclassifications
Total revenues	$	—		$	—		$	—		$	—		$	—
Cost of service revenue	7,466			6,675			6,759			7,276			28,176
Cost of product revenue	—			—			—			—			—
Research and development	471			330			368			378			1,547
Sales and marketing	(10,247		)	(9,363		)	(9,897		)	(10,877		)	(40,384		)
General and administrative	2,310			2,358			2,770			3,223			10,661
Loss from operations	$	—		$	—		$	—		$	—		$	—

Post-Reclassification
Total revenues	$	60,041		$	63,183		$	63,676		$	66,489		$	253,388
Cost of service revenue	17,701			17,512			17,285			18,079			70,576
Cost of product revenue	5,505			5,782			4,240			4,187			19,714
Research and development	7,181			6,835			7,462			7,520			28,999
Sales and marketing	21,444			24,328			25,770			27,351			98,893
General and administrative	9,111			9,105			10,622			13,037			41,875
Loss from operations	$	(901	)	$	(379	)	$	(1,703	)	$	(3,685	)	$	(6,669	)



													Twelve Months
	Three Months Ended (unaudited)												Ended
	June 30,			September 30,			December 31,			March 31,			March 31,
	2017			2017			2017			2018			2018
Pre-Reclassification
Total revenues	$	69,098		$	72,483		$	75,575		$	79,344		$	296,500
Cost of service revenue	11,662			12,757			12,318			13,952			50,689
Cost of product revenue	4,884			5,098			4,675			5,826			20,482
Research and development	7,943			8,311			8,527			10,016			34,797
Sales and marketing	41,110			41,163			48,830			52,940			184,044
General and administrative	8,956			9,616			10,003			10,340			38,915
Impairment of goodwill, intangible assets, and equipment	—			—			9,469			—			9,469
Loss from operations	$	(5,457	)	$	(4,462	)	$	(18,247	)	$	(13,730	)	$	(41,896	)

Reclassifications
Total revenues	$	—		$	—		$	—		$	—		$	—
Cost of service revenue	8,497			8,591			8,586			9,881			35,555
Cost of product revenue	—			—			—			—			—
Research and development	418			403			376			411			1,608
Sales and marketing	(12,650		)	(12,483		)	(12,448		)	(12,518		)	(50,099		)
General and administrative	3,735			3,489			3,486			2,226			12,936
Loss from operations	$	—		$	—		$	—		$	—		$	—

Post-Reclassification
Total revenues	$	69,098		$	72,483		$	75,575		$	79,344		$	296,500
Cost of service revenue	20,159			21,348			20,904			23,833			86,244
Cost of product revenue	4,884			5,098			4,675			5,826			20,482
Research and development	8,361			8,714			8,903			10,427			36,405
Sales and marketing	28,460			28,680			36,382			40,422			133,945
General and administrative	12,691			13,105			13,489			12,566			51,851
Impairment of goodwill, intangible assets, and equipment	—			—			9,469			—			9,469
Loss from operations	$	(5,457	)	$	(4,462	)	$	(18,247	)	$	(13,730	)	$	(41,896	)




	Three Months Ended (unaudited)												Twelve Months
	As Previously Reported												Ended
	June 30,			September 30,			December 31,			March 31,			March 31,
	2018			2018			2018			2019			2019
Pre-Reclassification
Total revenues	$	83,225		$	85,682		$	89,912		$	93,767		$	352,586
Cost of service revenue	15,079			15,866			17,043			17,672			65,660
Cost of product revenue	6,281			5,397			5,318			5,784			22,780
Research and development	13,110			13,933			16,876			17,815			61,734
Sales and marketing	53,305			55,930			60,717			64,610			234,562
General and administrative	11,433			16,543			14,196			16,666			58,838
Loss from operations	$	(15,983	)	$	(21,987	)	$	(24,238	)	$	(28,780	)	$	(90,988	)

Reclassifications
Total revenues	$	—		$	—		$	—		$	—		$	—
Cost of service revenue	9,470			10,336			10,589			11,137			41,532
Cost of product revenue	—			—			—			—			—
Research and development	(60		)	131			10			249			330
Sales and marketing	(12,810		)	(14,250		)	(14,441		)	(15,085		)	(56,586		)
General and administrative	3,400			3,783			3,842			3,699			14,724
Loss from operations	$	—		$	—		$	—		$	—		$	—

Post-Reclassification
Total revenues	$	83,225		$	85,682		$	89,912		$	93,767		$	352,586
Cost of service revenue	24,549			26,202			27,632			28,809			107,192
Cost of product revenue	6,281			5,397			5,318			5,784			22,780
Research and development	13,050			14,064			16,886			18,064			62,063
Sales and marketing	40,495			41,680			46,276			49,525			177,976
General and administrative	14,833			20,326			18,038			20,365			73,563
Loss from operations	$	(15,983	)	$	(21,987	)	$	(24,238	)	$	(28,780	)	$	(90,988	)

SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)

12 Months Ended

Mar. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Data (Unaudited)

In thousands, except per share data amounts:



	QUARTER ENDED
	March 31, 2019			December 31, 2018			September 30, 2018			June 30, 2018			March 31, 2018			December 31, 2017			September 30, 2017			June 30, 2017
Total revenues	$	93,767		$	89,912		85,682			$	83,225		$	79,344		$	75,575		$	72,483		$	69,098
Gross profit	59,174			56,962			54,083			52,395			49,685			49,996			46,037			44,055
Loss from operations	(28,780		)	(24,238		)	(21,987		)	(15,983		)	(13,730		)	(18,247		)	(4,462		)	(5,457		)
Net income (loss)	(28,131		)	(23,771		)	(21,482		)	(15,355		)	(13,262		)	(88,520		)	(546		)	(2,169		)
Net income (loss) per share:
Basic and diluted	$	(0.29	)	$	(0.25	)	$	(0.23	)	$	(0.16	)	$	(0.14	)	$	(0.96	)	$	(0.01	)	$	(0.02	)

THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)	12 Months Ended
	Mar. 31, 2019 USD ($) reporting_unit	Mar. 31, 2018 USD ($) reporting_unit	Mar. 31, 2017 USD ($)	Apr. 01, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Capitalized contract cost, amortization period	5 years
Number of reporting units \| reporting_unit	1	3
Goodwill impairment loss	$ 0	$ 8,036,000	$ 0
Advertising expense	$ 25,000,000	$ 14,500,000	$ 9,500,000
Share-based Compensation Award, Tranche One \| Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	50.00%	50.00%
Share-based Compensation Award, Tranche Two \| Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	50.00%	50.00%
Percentage increase (decrease) in shares earned per 1% change in total shareholder returns	2.00%	2.00%
Minimum percentage of common stock performance	(30.00%)	(30.00%)
Maximum percentage of number of shares issued per tranche	200.00%	200.00%
Equipment
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Property, plant and equipment, useful life	3 years
Software and Software Development Costs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Property, plant and equipment, useful life	3 years
Furniture and fixtures
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Property, plant and equipment, useful life	5 years
Computer Software, Intangible Asset
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Finite-lived intangible asset, useful life	3 years
Accounting Standards Update 2016-02 \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred rent credit				$ (1,900,000)
Minimum \| Accounting Standards Update 2016-02 \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Operating lease, right-of-use asset				13,100,000
Operating lease, liability				15,000,000
Maximum \| Accounting Standards Update 2016-02 \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Operating lease, right-of-use asset				14,100,000
Operating lease, liability				$ 16,000,000

THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES - Adoption Impact of ASC 606 (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Apr. 01, 2018
Current assets:
Deferred sales commission costs	$ 15,601				$ 0								$ 15,601	$ 0		$ 11,234
Other current assets	15,127				10,040								15,127	10,040		11,765
Non-current assets:
Deferred sales commission costs, non-current	33,693				0								33,693	0		26,942
Stockholders' equity:
Accumulated deficit	(250,302)				(201,464)								(250,302)	(201,464)		(161,563)
Income Statement Related Disclosures [Abstract]
Total revenue	93,767	$ 89,912	$ 85,682	$ 83,225	79,344	$ 75,575	$ 72,483	$ 69,098	$ 66,489	$ 63,676	$ 63,183	$ 60,041	352,586	296,500	$ 253,388
Sales and marketing	49,525	46,276	41,680	40,495	40,422	36,382	28,680	28,460	27,351	25,770	24,328	21,444	177,976	133,945	98,893
Loss from operations	(28,780)	(24,238)	(21,987)	(15,983)	(13,730)	(18,247)	(4,462)	(5,457)	$ (3,685)	$ (1,703)	$ (379)	$ (901)	(90,988)	(41,896)	(6,669)
Net loss	$ (28,131)	$ (23,771)	$ (21,482)	$ (15,355)	$ (13,262)	$ (88,520)	$ (546)	$ (2,169)					$ (88,739)	$ (104,497)	$ (4,751)
Net loss per share:
Basic and diluted (in dollars per share)	$ (0.29)	$ (0.25)	$ (0.23)	$ (0.16)	$ (0.14)	$ (0.96)	$ (0.01)	$ (0.02)					$ (0.94)	$ (1.14)	$ (0.05)
Statement of Cash Flows [Abstract]
Net loss	$ (28,131)	$ (23,771)	$ (21,482)	$ (15,355)	$ (13,262)	$ (88,520)	$ (546)	$ (2,169)					$ (88,739)	$ (104,497)	$ (4,751)
Amortization of deferred sales commission costs													14,204	0	0
Deferred sales commission costs													(25,286)	0	0
Other current and non-current assets													(4,337)	(3,149)	(2,515)
Net cash provided by operating activities													(14,868)	22,041	28,478
Service
Income Statement Related Disclosures [Abstract]
Total revenue													334,438	280,430	235,816
Product
Income Statement Related Disclosures [Abstract]
Total revenue													18,148	16,070	$ 17,572
ASC 605
Current assets:
Deferred sales commission costs	0				0								0	0
Other current assets	9,410				10,040								9,410	10,040
Non-current assets:
Deferred sales commission costs, non-current	0				0								0	0
Stockholders' equity:
Accumulated deficit	(305,313)				$ (201,464)								(305,313)	$ (201,464)
Income Statement Related Disclosures [Abstract]
Total revenue													351,942
Sales and marketing													189,058
Loss from operations													(102,714)
Net loss													$ (100,465)
Net loss per share:
Basic and diluted (in dollars per share)													$ (1.06)
Statement of Cash Flows [Abstract]
Net loss													$ (100,465)
Amortization of deferred sales commission costs													0
Deferred sales commission costs													0
Other current and non-current assets													(3,693)
Net cash provided by operating activities													(14,868)
ASC 605 \| Service
Income Statement Related Disclosures [Abstract]
Total revenue													335,671
ASC 605 \| Product
Income Statement Related Disclosures [Abstract]
Total revenue													16,271
Adjustments \| Accounting Standards Update 2014-09
Current assets:
Deferred sales commission costs	15,601												15,601			11,234
Other current assets	5,717												5,717			1,725
Non-current assets:
Deferred sales commission costs, non-current	33,693												33,693			26,942
Stockholders' equity:
Accumulated deficit	$ 55,011												55,011			$ 39,901
Income Statement Related Disclosures [Abstract]
Total revenue													644
Sales and marketing													(11,082)
Loss from operations													11,726
Net loss													$ 11,726
Net loss per share:
Basic and diluted (in dollars per share)													$ 0.12
Statement of Cash Flows [Abstract]
Net loss													$ 11,726
Deferred sales commission costs													(25,286)
Other current and non-current assets													(644)
Net cash provided by operating activities													0
Adjustments \| Accounting Standards Update 2014-09 \| Service
Income Statement Related Disclosures [Abstract]
Total revenue													(1,233)
Adjustments \| Accounting Standards Update 2014-09 \| Product
Income Statement Related Disclosures [Abstract]
Total revenue													$ 1,877

REVENUE RECOGNITION - Narrative (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Dec. 31, 2018	Mar. 31, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract with customer, liability, revenue recognized		$ 2.5
Revenue, remaining performance obligation, amount		$ 170.0
Revenue remaining performance obligation, expected timing of satisfaction		24 months
Minimum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Subscription term	1 year
Maximum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Subscription term	4 years

REVENUE RECOGNITION - Contract Balances (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Apr. 01, 2018	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Accounts receivable, net	$ 20,181		$ 16,296
Other current assets	5,717	$ 1,725
Deferred revenue	3,336		2,559
Non-current deferred revenue	$ 6		$ 19

REVENUE RECOGNITION - Changes in Contract Balances (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Apr. 01, 2018
Revenue from Contract with Customer [Abstract]
Other current assets	$ 5,717	$ 1,725
Deferred revenue	3,342	$ 2,578
Change in other current assets	3,992
Change in deferred revenue	$ 764

FAIR VALUE MEASUREMENTS - Cash, Cash Equivalents and Investments with Hierarchy (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 276,583	$ 31,703
Accumulated gross unrealized gain, before tax	77	10
Accumulated gross unrealized loss, before tax	(61)	(464)
Debt securities, available-for-sale	69,899	120,559
Cash, cash equivalents and debt securities available-for-sale, amortized cost	346,466	152,716
Cash, cash equivalents and debt securities available-for-sale	346,482	152,262
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	276,583	31,703
Cash and cash equivalents, fair value disclosure	276,583	31,703
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Costs	69,883	121,013
Accumulated gross unrealized gain, before tax	77	10
Accumulated gross unrealized loss, before tax	(61)	(464)
Debt securities, available-for-sale	69,899	120,559
Commercial paper \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Costs		13,254
Accumulated gross unrealized gain, before tax		0
Accumulated gross unrealized loss, before tax		(8)
Debt securities, available-for-sale		13,246
Corporate debt \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Costs	46,516	70,631
Accumulated gross unrealized gain, before tax	51	6
Accumulated gross unrealized loss, before tax	(29)	(296)
Debt securities, available-for-sale	46,538	70,341
Municipal securities \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Costs	5,511
Accumulated gross unrealized gain, before tax	17
Accumulated gross unrealized loss, before tax	0
Debt securities, available-for-sale	5,528
Asset backed securities \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Costs	13,596	3,385
Accumulated gross unrealized gain, before tax	9	3
Accumulated gross unrealized loss, before tax	(17)	(1)
Debt securities, available-for-sale	13,588	3,387
Mortgage backed securities \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Costs		27,063
Accumulated gross unrealized gain, before tax		1
Accumulated gross unrealized loss, before tax		(119)
Debt securities, available-for-sale		26,945
Agency bond \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Costs	4,260	4,183
Accumulated gross unrealized gain, before tax	0	0
Accumulated gross unrealized loss, before tax	(15)	(35)
Debt securities, available-for-sale	4,245	4,148
Cash
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	25,364	16,499
Cash and cash equivalents, fair value disclosure	25,364	16,499
Money market funds \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	251,219	15,204
Cash and cash equivalents, fair value disclosure	$ 251,219	$ 15,204

FAIR VALUE MEASUREMENTS - Narrative (Details) $ in Millions	Mar. 31, 2019 USD ($)
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible debt, fair value	$ 216.0

FAIR VALUE MEASUREMENTS - Contractual Maturity of Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Due within one year	$ 32,385
Due after one year	37,514
Total	$ 69,899	$ 120,559

PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Property, Plant and Equipment [Line Items]
Gross	$ 102,231	$ 69,172
Less: accumulated depreciation and amortization	(49,396)	(33,440)
Net	52,835	35,732
Computer equipment
Property, Plant and Equipment [Line Items]
Gross	34,706	29,761
Software development costs
Property, Plant and Equipment [Line Items]
Gross	39,131	20,144
Software licenses
Property, Plant and Equipment [Line Items]
Gross	9,713	8,663
Leasehold improvements
Property, Plant and Equipment [Line Items]
Gross	6,286	6,573
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Gross	2,324	1,637
Construction in progress
Property, Plant and Equipment [Line Items]
Gross	$ 10,071	$ 2,394

INTANGIBLE ASSETS, GOODWILL AND OTHER ASSETS - Schedule Of Intangibles (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 37,372	$ 31,681
Accumulated Amortization	(25,692)	(19,723)
Net Carrying Amount	11,680	11,958
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	25,702	19,702
Accumulated Amortization	(15,409)	(10,535)
Net Carrying Amount	10,293	9,167
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	9,467	9,776
Accumulated Amortization	(8,080)	(7,366)
Net Carrying Amount	1,387	2,410
Trade names/domains
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,108	2,108
Accumulated Amortization	(2,108)	(1,727)
Net Carrying Amount	$ 0	$ 381

INTANGIBLE ASSETS, GOODWILL AND OTHER ASSETS - Schedule Of Future Amortization Of Intangibles (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2020	$ 6,116
2021	3,569
2022	1,766
2023	229
Total	$ 11,680

INTANGIBLE ASSETS, GOODWILL AND OTHER ASSETS - Narrative (Details)	3 Months Ended	12 Months Ended
	Dec. 31, 2017 USD ($)	Mar. 31, 2019 USD ($) reporting_unit	Mar. 31, 2018 USD ($) reporting_unit	Mar. 31, 2017 USD ($)
Finite-Lived Intangible Assets [Line Items]
Number of reporting units \| reporting_unit		1	3
Impairment of goodwill and long-lived assets		$ 0	$ 9,469,000	$ 15,000
Goodwill impairment loss		0	$ 8,036,000	$ 0
Capitalized contract cost, amortization		14,200,000
Capitalized contract cost, impairment loss		$ 0
DXI
Finite-Lived Intangible Assets [Line Items]
Impairment of goodwill and long-lived assets	$ 300,000
Intangible asset impairment	1,200,000
Goodwill impairment loss	$ 8,000,000

INTANGIBLE ASSETS, GOODWILL AND OTHER ASSETS - Changes in Carrying Amount of Goodwill by Location (Details) - USD ($)	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 40,054,000	$ 46,136,000
Impairment loss	0	(8,036,000)	$ 0
Foreign currency translation	(860,000)	1,954,000
Impairment loss	500,000
Goodwill, ending balance	$ 39,694,000	$ 40,054,000	$ 46,136,000

COMMITMENTS AND CONTINGENCIES - Narrative (Details) ft² in Thousands		12 Months Ended
	Jan. 23, 2018 USD ($) ft²	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)
Lessee, Lease, Description [Line Items]
Rent expense		$ 10,600,000	$ 5,600,000	$ 5,100,000
Property and equipment under capital lease		3,400,000	3,500,000
Accumulated depreciation related to assets under capital lease		2,800,000	1,800,000
Headquarters Facility, San Jose, California
Lessee, Lease, Description [Line Items]
Operating lease, term of contract	132 months
Lease, area \| ft²	162
Line of Credit \| Standby Letters of Credit
Lessee, Lease, Description [Line Items]
Line of credit facility, maximum borrowing capacity	$ 8,100,000.0
Third-Party Customer Support Commitments
Lessee, Lease, Description [Line Items]
Other commitment		1,100,000
Third-Party Network Service Provider Commitments
Lessee, Lease, Description [Line Items]
Other commitment		1,900,000
State and Local Taxes and Surcharges
Lessee, Lease, Description [Line Items]
Accrued contingent indirect tax liabilities		8,000,000	$ 800,000
Sales Tax
Lessee, Lease, Description [Line Items]
Incremental sales tax liability		$ 7,200,000

COMMITMENTS AND CONTINGENCIES - Operating Leases (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2020	$ 7,143
2021	8,907
2022	8,797
2023	1,556
2024	1,140
Thereafter	2,279
Total	$ 29,822

COMMITMENTS AND CONTINGENCIES - Capital Leases (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Year ending March 31:
2020	$ 436
2021	64
2022	19
2023	15
2024	15
Total minimum payments	549
Less: Amount representing interest	(15)
Total payments, net of interest	534
Less: Short-term portion of capital lease obligations	(424)
Long-term portion of capital lease obligations	$ 110

CONVERTIBLE SENIOR NOTES AND CAPPED CALL - Narrative (Details) $ / shares in Units, shares in Millions	1 Months Ended	12 Months Ended
	Feb. 28, 2019 USD ($) day $ / shares shares	Mar. 31, 2019 USD ($) $ / shares	Mar. 31, 2018 $ / shares
Debt Instrument [Line Items]
Common stock, par value per share (in dollars per share) \| $ / shares		$ 0.001	$ 0.001
Payments for capped call transactions		$ (33,724,000)
Convertible Debt \| Convertible Senior Notes
Debt Instrument [Line Items]
Debt instrument, face value	$ 287,500,000.0	$ 287,500,000
Debt instrument, interest rate	0.50%
Proceeds from issuance of debt	$ 245,800,000
Debt instrument, convertible, conversion ratio	0.0389484
Common stock, par value per share (in dollars per share) \| $ / shares	$ 0.001
Debt instrument, convertible, conversion price (in dollars per share) \| $ / shares	$ 25.68
Debt instrument, convertible, threshold trading days \| day	20
Debt instrument, convertible, threshold consecutive trading days \| day	30
Debt instrument, convertible, threshold percentage of stock price trigger	130.00%
Debt instrument, convertible, measurement period \| day	5
Debt instrument, convertible, threshold consecutive trading days preceding measurement period \| day	10
Debt instrument, threshold percentage of sales price per share	98.00%
Debt instrument, redemption price, percentage	100.00%
Conversion option	$ 66,700,000
Debt instrument, effective interest rate	6.50%
Debt issuance costs, net	$ 600,000
Debt instrument, strike price per share (in dollars per share) \| $ / shares	$ 25.68
Debt instrument, initial cap price per share (in dollars per share) \| $ / shares	$ 39.50
Payments for capped call transactions	$ 33,700,000
Call Option \| Convertible Debt \| Convertible Senior Notes
Debt Instrument [Line Items]
Option indexed to issuer's equity, indexed shares (in shares) \| shares	11.2

CONVERTIBLE SENIOR NOTES AND CAPPED CALL - Carrying Amount of the Liability Component (Details) - Convertible Debt - Convertible Senior Notes - USD ($)	Mar. 31, 2019	Feb. 28, 2019
Debt Instrument [Line Items]
Principal	$ 287,500,000	$ 287,500,000.0
Unamortized debt discount	(70,876,000)
Unamortized issuance costs	(589,000)
Net carrying amount	$ 216,035,000

CONVERTIBLE SENIOR NOTES AND CAPPED CALL - Carrying Amount of the Equity Component (Details) - Convertible Debt - Convertible Senior Notes, Equity Component $ in Thousands	Mar. 31, 2019 USD ($)
Debt Instrument [Line Items]
Debt discount for conversion option	$ 66,700
Issuance costs	(1,848)
Net carrying amount	$ 64,852

CONVERTIBLE SENIOR NOTES AND CAPPED CALL - Interest Expense (Details) - Convertible Debt - Convertible Senior Notes $ in Thousands	12 Months Ended
	Mar. 31, 2019 USD ($)
Debt Instrument [Line Items]
Contractual interest expense	$ 156
Amortization of debt discount	1,343
Amortization of issuance costs	11
Total interest expense	$ 1,510

CONVERTIBLE SENIOR NOTES AND CAPPED CALL - Net Impact to Stockholders' Equity (Details) $ in Thousands	12 Months Ended
	Mar. 31, 2019 USD ($)
Debt Disclosure [Abstract]
Conversion option	$ 66,700
Payments for capped call transactions	(33,724)
Issuance costs	(1,848)
Total	$ 31,128

STOCKHOLDERS' EQUITY - Narrative (Details) - USD ($)				1 Months Ended			12 Months Ended
STOCKHOLDERS' EQUITY - Narrative (Details) - USD ($)	Sep. 18, 2006	Jan. 01, 2005	Dec. 31, 2004	Aug. 31, 2017	May 31, 2017	May 31, 2006	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Aug. 31, 2018	Jun. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Oct. 31, 2016	Aug. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Nov. 30, 2014	Aug. 31, 2014	Sep. 30, 2013	Jun. 30, 2012	Jun. 30, 1996
2015 Repurchase Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount														$ 15,000,000.0		$ 15,000,000.0
2017 Repurchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount					$ 25,000,000
Stock repurchase program, remaining authorized repurchase amount							$ 7,100,000
2006 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for future issuance (in shares)						7,000,000
Vesting period							4 years
Expiration period							10 years
Number of shares available for future grant (in shares)							0
2012 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for future issuance (in shares)																					4,100,000
Vesting period							4 years
Expiration period							10 years
Number of shares available for future grant (in shares)							10,700,000
Number of additional shares reserved for future issuance (in shares)										16,300,000					4,500,000				6,800,000
2013 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for future issuance (in shares)																				1,000,000
Vesting period							4 years
Expiration period							10 years
Number of shares available for future grant (in shares)							0
Number of additional shares reserved for future issuance (in shares)																	1,200,000	1,200,000
2017 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for future issuance (in shares)													1,000,000
Vesting period							3 years
Expiration period							10 years
Number of shares available for future grant (in shares)							600,000
Number of additional shares reserved for future issuance (in shares)											1,500,000	1,500,000
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of options exercised							$ 10,000,000	$ 9,000,000	$ 7,200,000
Unamortized stock-based compensation expense							$ 107,000,000
Weighted average period of recognition for unrecognized compensation expense							2 years 3 months 18 days
Employee Stock \| Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for future issuance (in shares)							500,000															500,000
Unamortized stock-based compensation expense							$ 1,800,000
Weighted average period of recognition for unrecognized compensation expense							7 months 6 days
Term of extension	10 years			10 years	10 years	10 years
Value of shares issued under employee stock purchase plan							$ 500,000	$ 400,000	$ 300,000
Percentage of market value price of common stock under Employee Stock Purchase Plan							85.00%
Duration of offering period		1 year	2 years
Duration of purchase period			6 months
Maximum contribution percentage amount of employee's base compensation							10.00%

STOCKHOLDERS' EQUITY - Stock-Based Compensation Expense By Statement Of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based employee compensation expense	$ 44,508	$ 29,176	$ 21,462
Research and Development Expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based employee compensation expense	12,313	6,625	3,762
Selling and Marketing Expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based employee compensation expense	11,951	6,630	5,334
General and Administrative Expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based employee compensation expense	14,717	11,944	9,058
Service \| Cost of Sales
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based employee compensation expense	5,527	3,977	3,308
Product \| Cost of Sales
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based employee compensation expense	$ 0	$ 0	$ 0

STOCKHOLDERS' EQUITY - Option Activity (Details) - $ / shares	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Number of Shares
Outstanding, beginning balance (in shares)	3,998,285	4,462,412	4,793,266
Granted (in shares)	236,799	609,135	407,392
Exercised (in shares)	(759,884)	(773,897)	(603,998)
Canceled/forfeited (in shares)	(361,129)	(299,365)	(134,248)
Outstanding, ending balance (in shares)	3,114,071	3,998,285	4,462,412
Vested and expected to vest, end of period (in shares)	3,114,071
Exercisable, end of period (in shares)	2,737,032
Weighted Average Exercise Price Per Share
Outstanding, beginning balance (in dollars per share)	$ 8.93	$ 7.52	$ 6.29
Granted (in dollars per share)	21.65	14.95	14.63
Exercised (in dollars per share)	7.70	3.95	2.34
Canceled/Forfeited (in dollars per share)	15.41	13.05	8.41
Outstanding, ending balance (in dollars per share)	9.45	$ 8.93	$ 7.52
Vested and expected to vest, ending balance (in dollars per share)	9.45
Exercisable, end of period (in dollars per share)	$ 8.33

STOCKHOLDERS' EQUITY - Stock Purchase Right and Restricted Stock Unit Activity (Details) - $ / shares	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Stock Purchase Right
Number of Shares
Beginning balance (in shares)	4,975	11,370	82,171
Granted (in shares)	0	0	0
Vested and released (in shares)	(4,625)	(6,395)	(69,426)
Forfeited (in shares)	(350)	0	(1,375)
Ending balance (in shares)	0	4,975	11,370	82,171
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share)	$ 8.10	$ 8.10	$ 6.30
Granted (in dollars per share)	0.00	0.00	0.00
Vested and released (in dollars per share)	7.88	8.26	6.00
Forfeited (in dollars per share)	7.88	0.00	6.72
Ending balance (in dollars per share)	$ 0.00	$ 8.10	$ 8.10	$ 6.30
Weighted Average Remaining Contractual Term (in Years)		1 year 1 month 2 days	1 year 1 month 2 days	9 months 3 days
Restricted stock units
Number of Shares
Beginning balance (in shares)	5,935,543	4,939,050	4,544,799
Granted (in shares)	5,726,787	3,481,870	2,491,877
Vested and released (in shares)	(2,399,371)	(1,833,038)	(1,600,831)
Forfeited (in shares)	(1,442,471)	(652,339)	(496,795)
Ending balance (in shares)	7,820,488	5,935,543	4,939,050	4,544,799
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share)	$ 13.51	$ 11.57	$ 8.08
Granted (in dollars per share)	19.77	14.41	15.15
Vested and released (in dollars per share)	12.87	10.27	7.89
Forfeited (in dollars per share)	16.85	12.73	9.56
Ending balance (in dollars per share)	$ 17.68	$ 13.51	$ 11.57	$ 8.08
Weighted Average Remaining Contractual Term (in Years)	1 year 4 months 6 days	1 year 7 months 6 days	1 year 6 months 18 days	1 year 8 months 1 day

STOCKHOLDERS' EQUITY - Assumptions Used In Black-Scholes Model (Details) - $ / shares	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	41.00%	41.00%	44.00%
Expected dividend yield	0.00%	0.00%	0.00%
Risk-free interest rate, minimum	2.50%	1.80%	1.10%
Risk-free interest rate, maximum	3.00%	2.40%	2.20%
Weighted average expected term (in years)	4 years 5 months 18 days	4 years 9 months 18 days	4 years 10 months 24 days
Weighted average fair value of options granted (in dollars per share)	$ 8.19	$ 5.70	$ 5.74
Stock Purchase Right
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	41.00%	40.00%	37.00%
Expected dividend yield	0.00%	0.00%	0.00%
Risk-free interest rate	2.43%	1.33%	0.65%
Weighted average expected term (in years)	9 months 18 days	9 months 18 days	9 months 18 days
Weighted average fair value of options granted (in dollars per share)	$ 5.74	$ 4.10	$ 4.19

INCOME TAXES - Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Current:
Federal	$ 0	$ (395)	$ (7)
State	291	256	588
Foreign	278	185	112
Total current tax provision	569	46	693
Deferred
Federal	0	59,837	1,506
State	0	6,664	(1,095)
Foreign	0	(253)	(1,230)
Total deferred tax provision (benefit)	0	66,248	(819)
Total income tax provision (benefit)	$ 569	$ 66,294	$ (126)

INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Deferred tax assets
Net operating loss carryforwards	$ 61,740	$ 40,465
Net operating loss carryforwards	15,573	11,761
Stock-based compensation	9,006	6,389
Reserves and allowances	5,697	3,181
Fixed assets and intangibles	2,709	378
Gross deferred tax assets	94,725	62,174
Valuation allowance	(65,948)	(62,174)
Total deferred tax assets	28,777	0
Deferred tax liabilities
Deferred sales commissions	(12,221)	0
Convertible debt	(16,556)	0
Net deferred taxes	$ 0	$ 0

INCOME TAXES - Reconciliation of Taxes Provided to Federal Statutory Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Tax benefit at statutory rate	$ (18,441)	$ (11,790)	$ (1,652)
State income taxes before valuation allowance, net of federal effect	(3,612)	(1,042)	108
Foreign tax rate differential	71	(1,188)	885
Research and development credits	(3,744)	(2,189)	(1,484)
Change in valuation allowance	30,558	56,663	(287)
Compensation/option differences	(7,277)	(4,965)	(246)
Non-deductible compensation	1,200	1,132	1,079
Tax Act rate change impact	0	22,630	0
Acquisition costs	0	0	54
Foreign loss not benefited	159	6,847	780
Other	1,655	196	637
Total income tax provision (benefit)	$ 569	$ 66,294	$ (126)

INCOME TAXES - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Balance at beginning of year	$ 3,980	$ 3,331	$ 2,881
Gross increases - tax position in prior period	17	0	0
Gross increases - tax position related to the current year	1,036	649	450
Balance at end of year	$ 5,033	$ 3,980	$ 3,331

INCOME TAXES - Narrative (Details) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
INCOME TAXES - Narrative (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Income Tax Contingency [Line Items]
Deferred tax asset adjustment due to change in enacted tax rate			$ 0	$ 22,630,000	$ 0
Provision (benefit) for income taxes			569,000	66,294,000	(126,000)
Undistributed earnings (losses) of foreign subsidiaries	$ (19,700,000)		200,000	(19,700,000)	$ (8,400,000)
Deferred tax assets, valuation allowance	$ 62,174,000		$ 65,948,000	62,174,000
Federal tax rate	21.00%	34.00%	21.00%		34.00%
Unrecognized tax benefits	$ 3,980,000		$ 5,033,000	3,980,000	$ 3,331,000	$ 2,881,000
Accrued penalties and interest	$ 0		0	$ 0	$ 0
Internal Revenue Service (IRS)
Income Tax Contingency [Line Items]
Research tax credit carryforwards			10,100,000
State and Local Jurisdiction
Income Tax Contingency [Line Items]
Operating loss carryforwards			80,000,000
Research tax credit carryforwards			11,500,000
Tax Year 2019 \| Internal Revenue Service (IRS)
Income Tax Contingency [Line Items]
Operating loss carryforwards			88,600,000
Tax Years Prior To 2019 \| Internal Revenue Service (IRS)
Income Tax Contingency [Line Items]
Operating loss carryforwards			$ 156,400,000

NET INCOME (LOSS) PER SHARE - Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Numerator:
Net loss available to common stockholders	$ (28,131)	$ (23,771)	$ (21,482)	$ (15,355)	$ (13,262)	$ (88,520)	$ (546)	$ (2,169)	$ (88,739)	$ (104,497)	$ (4,751)
Denominator:
Denominator for basic and diluted calculation (in shares)									94,533	92,017	90,340
Net loss per share - basic and diluted (in dollars per share)	$ (0.29)	$ (0.25)	$ (0.23)	$ (0.16)	$ (0.14)	$ (0.96)	$ (0.01)	$ (0.02)	$ (0.94)	$ (1.14)	$ (0.05)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

NET INCOME (LOSS) PER SHARE - Schedule of Antidilutive Awards (Details) - shares shares in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive shares	10,934	9,938	9,412
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive shares	3,114	3,998	4,462
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive shares	7,820	5,940	4,950

GEOGRAPHICAL INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
GEOGRAPHICAL INFORMATION (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Revenue	$ 93,767	$ 89,912	$ 85,682	$ 83,225	$ 79,344	$ 75,575	$ 72,483	$ 69,098	$ 66,489	$ 63,676	$ 63,183	$ 60,041	$ 352,586	$ 296,500	$ 253,388
Property and Equipment	52,835				35,732								52,835	35,732
Americas
Segment Reporting Information [Line Items]
Revenue													316,427	266,034	227,914
Property and Equipment	45,639				27,270								45,639	27,270
Europe
Segment Reporting Information [Line Items]
Revenue													36,159	30,466	$ 25,474
Property and Equipment	$ 7,196				$ 8,462								$ 7,196	$ 8,462

ACQUISITIONS (Details) - Technology-Based Intangible Assets	Oct. 29, 2018	Apr. 12, 2018	Jan. 05, 2017
LeChat
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life			2 years
Finite-lived intangible assets, remaining amortization period			2 years
MarianaIQ
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life		2 years
Finite-lived intangible assets, remaining amortization period		2 years
Jitsi
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	2 years
Finite-lived intangible assets, remaining amortization period	2 years

RECLASSIFICATIONS (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
RECLASSIFICATIONS (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenue	$ 93,767	$ 89,912	$ 85,682	$ 83,225	$ 79,344	$ 75,575	$ 72,483	$ 69,098	$ 66,489	$ 63,676	$ 63,183	$ 60,041	$ 352,586	$ 296,500	$ 253,388
Research and development	18,064	16,886	14,064	13,050	10,427	8,903	8,714	8,361	7,520	7,462	6,835	7,181	62,063	36,405	28,999
Sales and marketing	49,525	46,276	41,680	40,495	40,422	36,382	28,680	28,460	27,351	25,770	24,328	21,444	177,976	133,945	98,893
General and administrative	20,365	18,038	20,326	14,833	12,566	13,489	13,105	12,691	13,037	10,622	9,105	9,111	73,563	51,851	41,875
Impairment of goodwill, intangible assets and equipment					0	9,469	0	0					0	9,469	0
Loss from operations	(28,780)	(24,238)	(21,987)	(15,983)	(13,730)	(18,247)	(4,462)	(5,457)	(3,685)	(1,703)	(379)	(901)	(90,988)	(41,896)	(6,669)
Pre-Reclassification
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenue	93,767	89,912	85,682	83,225	79,344	75,575	72,483	69,098	66,489	63,676	63,183	60,041	352,586	296,500	253,388
Research and development	17,815	16,876	13,933	13,110	10,016	8,527	8,311	7,943	7,142	7,094	6,505	6,710	61,734	34,797	27,452
Sales and marketing	64,610	60,717	55,930	53,305	52,940	48,830	41,163	41,110	38,228	35,667	33,691	31,691	234,562	184,044	139,277
General and administrative	16,666	14,196	16,543	11,433	10,340	10,003	9,616	8,956	9,814	7,852	6,747	6,801	58,838	38,915	31,214
Impairment of goodwill, intangible assets and equipment					0	9,469	0	0						9,469
Loss from operations	(28,780)	(24,238)	(21,987)	(15,983)	(13,730)	(18,247)	(4,462)	(5,457)	(3,685)	(1,703)	(379)	(901)	(90,988)	(41,896)	(6,669)
Reclassifications
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenue	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Research and development	249	10	131	(60)	411	376	403	418	378	368	330	471	330	1,608	1,547
Sales and marketing	(15,085)	(14,441)	(14,250)	(12,810)	(12,518)	(12,448)	(12,483)	(12,650)	(10,877)	(9,897)	(9,363)	(10,247)	(56,586)	(50,099)	(40,384)
General and administrative	3,699	3,842	3,783	3,400	2,226	3,486	3,489	3,735	3,223	2,770	2,358	2,310	14,724	12,936	10,661
Loss from operations	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Service
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenue													334,438	280,430	235,816
Cost of revenue	28,809	27,632	26,202	24,549	23,833	20,904	21,348	20,159	18,079	17,285	17,512	17,701	107,192	86,244	70,576
Service \| Pre-Reclassification
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of revenue	17,672	17,043	15,866	15,079	13,952	12,318	12,757	11,662	10,803	10,526	10,837	10,235	65,660	50,689	42,400
Service \| Reclassifications
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of revenue	11,137	10,589	10,336	9,470	9,881	8,586	8,591	8,497	7,276	6,759	6,675	7,466	41,532	35,555	28,176
Product
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenue													18,148	16,070	17,572
Cost of revenue	5,784	5,318	5,397	6,281	5,826	4,675	5,098	4,884	4,187	4,240	5,782	5,505	22,780	20,482	19,714
Product \| Pre-Reclassification
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of revenue	5,784	5,318	5,397	6,281	5,826	4,675	5,098	4,884	4,187	4,240	5,782	5,505	22,780	20,482	19,714
Product \| Reclassifications
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of revenue	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0

SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Total revenue	$ 93,767	$ 89,912	$ 85,682	$ 83,225	$ 79,344	$ 75,575	$ 72,483	$ 69,098	$ 66,489	$ 63,676	$ 63,183	$ 60,041	$ 352,586	$ 296,500	$ 253,388
Gross profit	59,174	56,962	54,083	52,395	49,685	49,996	46,037	44,055
Loss from operations	(28,780)	(24,238)	(21,987)	(15,983)	(13,730)	(18,247)	(4,462)	(5,457)	$ (3,685)	$ (1,703)	$ (379)	$ (901)	(90,988)	(41,896)	(6,669)
Net loss	$ (28,131)	$ (23,771)	$ (21,482)	$ (15,355)	$ (13,262)	$ (88,520)	$ (546)	$ (2,169)					$ (88,739)	$ (104,497)	$ (4,751)
Net income (loss) per share:
Basic and diluted (in dollars per share)	$ (0.29)	$ (0.25)	$ (0.23)	$ (0.16)	$ (0.14)	$ (0.96)	$ (0.01)	$ (0.02)					$ (0.94)	$ (1.14)	$ (0.05)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

SCHEDULE II (Details) - Total Allowance for Doubtful Accounts - USD ($)
$ in Thousands

12 Months Ended

Mar. 31, 2019

Mar. 31, 2018

Mar. 31, 2017

SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]

Balance at Beginning of Year

$ 904

$ 954

$ 586

Additions Charged to Expenses

1,115

250

941

Deductions

^[1]

(1,155)

(300)

(573)

Balance at End of Year

$ 864

$ 904

$ 954

[1]	The deductions related to allowance for doubtful accounts represent accounts receivable which are written off.

Label	Element	Value
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 17,643,000
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	39,901,000
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	17,643,000
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 39,901,000