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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Loss | Accumulated Deficit
--- | --- | --- | --- | --- | ---
Beginning balance (shares) at Mar. 31, 2018 |  | 92,847,354 |  |  |
Beginning balance 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 (shares) |  | 403,377 |  |  |
Issuance of common stock under stock plans, less withholding | 777 |  | 777 |  |
Stock-based compensation expense | 9,304 |  | 9,304 |  |
Unrealized investment gain | 113 |  |  | 113 |
Foreign currency translation adjustment | (1,672) |  |  | (1,672) |
Net loss | (15,355) |  |  |  | (15,355)
Ending balance (shares) at Jun. 30, 2018 |  | 93,250,731 |  |  |
Ending balance at Jun. 30, 2018 | 251,842 | $ 93 | 435,871 | (7,204) | (176,918)
Beginning balance (shares) at Mar. 31, 2018 |  | 92,847,354 |  |  |
Beginning balance at Mar. 31, 2018 | 218,774 | $ 93 | 425,790 | (5,645) | (201,464)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Foreign currency translation adjustment | (2,600) |  |  |  |
Net loss | (60,608) |  |  |  |
Ending balance (shares) at Dec. 31, 2018 |  | 95,509,223 |  |  |
Ending balance at Dec. 31, 2018 | 227,729 | $ 95 | 457,889 | (8,084) | (222,171)
Beginning balance (shares) at Jun. 30, 2018 |  | 93,250,731 |  |  |
Beginning balance at Jun. 30, 2018 | 251,842 | $ 93 | 435,871 | (7,204) | (176,918)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock under stock plans, less withholding (shares) |  | 1,840,387 |  |  |
Issuance of common stock under stock plans, less withholding | (595) | $ 1 | (596) |  |
Stock-based compensation expense | 9,829 |  | 9,829 |  |
Unrealized investment gain | 149 |  |  | 149 |
Foreign currency translation adjustment | (379) |  |  | (379) |
Net loss | (21,482) |  |  |  | (21,482)
Ending balance (shares) at Sep. 30, 2018 |  | 95,091,118 |  |  |
Ending balance at Sep. 30, 2018 | 239,364 | $ 94 | 445,104 | (7,434) | (198,400)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock under stock plans, less withholding (shares) |  | 418,105 |  |  |
Issuance of common stock under stock plans, less withholding | (280) | $ 1 | (281) |  |
Stock-based compensation expense | 13,066 |  | 13,066 |  |
Unrealized investment gain | (101) |  |  | (101) |
Foreign currency translation adjustment | (549) |  |  | (549) |
Net loss | (23,771) |  |  |  | (23,771)
Ending balance (shares) at Dec. 31, 2018 |  | 95,509,223 |  |  |
Ending balance at Dec. 31, 2018 | 227,729 | $ 95 | 457,889 | (8,084) | (222,171)
Beginning balance (shares) at Mar. 31, 2019 |  | 96,119,888 |  |  |
Beginning balance at Mar. 31, 2019 | 249,390 | $ 96 | 506,949 | (7,353) | (250,302)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock under stock plans, less withholding (shares) |  | 451,308 |  |  |
Issuance of common stock under stock plans, less withholding | 1,494 | $ 1 | 1,493 |  |
Stock-based compensation expense | 14,059 |  | 14,059 |  |
Unrealized investment gain | 121 |  |  | 121 |
Foreign currency translation adjustment | (652) |  |  | (652) |
Net loss | (34,265) |  |  |  | (34,265)
Ending balance (shares) at Jun. 30, 2019 |  | 96,571,196 |  |  |
Ending balance at Jun. 30, 2019 | 230,147 | $ 97 | 522,501 | (7,884) | (284,567)
Beginning balance (shares) at Mar. 31, 2019 |  | 96,119,888 |  |  |
Beginning balance at Mar. 31, 2019 | 249,390 | $ 96 | 506,949 | (7,353) | (250,302)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Foreign currency translation adjustment | 682 |  |  |  |
Net loss | (122,268) |  |  |  |
Ending balance (shares) at Dec. 31, 2019 |  | 100,784,960 |  |  |
Ending balance at Dec. 31, 2019 | 219,491 | $ 101 | 598,525 | (6,565) | (372,570)
Beginning balance (shares) at Jun. 30, 2019 |  | 96,571,196 |  |  |
Beginning balance at Jun. 30, 2019 | 230,147 | $ 97 | 522,501 | (7,884) | (284,567)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock under stock plans, less withholding (shares) |  | 1,761,483 |  |  |
Issuance of common stock under stock plans, less withholding | (788) | $ 2 | (790) |  |
Stock-based compensation expense | 17,867 |  | 17,867 |  |
Issuance of common stock related to acquisitions (shares) |  | 1,476,009 |  |  |
Issuance of common stock related to acquisitions | 35,839 | $ 1 | 35,838 |  |
Unrealized investment gain | (3) |  |  | (3) |
Foreign currency translation adjustment | (3,253) |  |  | (3,253) |
Net loss | (40,932) |  |  |  | (40,932)
Ending balance (shares) at Sep. 30, 2019 |  | 99,808,688 |  |  |
Ending balance at Sep. 30, 2019 | 238,877 | $ 100 | 575,416 | (11,140) | (325,499)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock under stock plans, less withholding (shares) |  | 976,272 |  |  |
Issuance of common stock under stock plans, less withholding | 140 | $ 1 | 139 |  |
Stock-based compensation expense | 19,881 |  | 19,881 |  |
Equity component of convertible senior notes, net of issuance costs | 3,089 |  | 3,089 |  |
Unrealized investment gain | (12) |  |  | (12) |
Foreign currency translation adjustment | 4,587 |  |  | 4,587 |
Net loss | (47,071) |  |  |  | (47,071)
Ending balance (shares) at Dec. 31, 2019 |  | 100,784,960 |  |  |
Ending balance at Dec. 31, 2019 | $ 219,491 | $ 101 | $ 598,525 | $ (6,565) | $ (372,570)

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