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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)

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