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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (unaudited) - USD ($) $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment | Common Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Income (Loss) | Accumulated Deficit | Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment
--- | --- | --- | --- | --- | --- | --- | ---
Common stock, beginning balance (in shares) at Dec. 31, 2018 |  |  | 115,500,000 |  |  |  |
Beginning balance at Dec. 31, 2018 | $ 410,634 | $ (111) | $ 116 | $ 818,113 | $ (1,019) | $ (406,576) | $ (111)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201602Member |  |  |  |  |  |
Equity component of convertible senior notes, net of issuance costs | $ 206,747 |  |  | 206,747 |  |  |
Purchase of convertible senior notes capped call | (97,200) |  |  | (97,200) |  |  |
Repurchase of common stock (in shares) |  |  | (504,000) |  |  |  |
Repurchase of common stock | (20,000) |  | $ (1) | (19,999) |  |  |
Issuance of common stock upon exercise of stock options and ESPP (in shares) |  |  | 2,545,000 |  |  |  |
Issuance of common stock upon exercise of stock options and ESPP | 27,720 |  | $ 3 | 27,717 |  |  |
Net issuance of common stock for settlement of RSUs (in shares) |  |  | 3,064,000 |  |  |  |
Net issuance of common stock for settlement of equity awards | (91,073) |  | $ 3 | (91,076) |  |  |
Issuance of common stock in connection with prior acquisition (in shares) |  |  | 64,000 |  |  |  |
Issuance of common stock in connection with prior acquisition | 3,003 |  |  | 3,003 |  |  |
Share-based compensation expense | 47,355 |  |  | 47,355 |  |  |
Other comprehensive income (loss) | (739) |  |  |  | (739) |  |
Net loss | (17,824) |  |  |  |  | (17,824) |
Common stock, ending balance (in shares) at Sep. 30, 2019 |  |  | 120,669,000 |  |  |  |
Beginning balance at Sep. 30, 2019 | 468,512 |  | $ 121 | 894,660 | (1,758) | (424,511) |
Common stock, beginning balance (in shares) at Jun. 30, 2019 |  |  | 119,336,000 |  |  |  |
Beginning balance at Jun. 30, 2019 | 459,571 |  | $ 119 | 873,104 | (618) | (413,034) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of common stock upon exercise of stock options and ESPP (in shares) |  |  | 991,000 |  |  |  |
Issuance of common stock upon exercise of stock options and ESPP | 11,674 |  | $ 1 | 11,673 |  |  |
Net issuance of common stock for settlement of RSUs (in shares) |  |  | 319,000 |  |  |  |
Net issuance of common stock for settlement of equity awards | (8,824) |  | $ 1 | (8,825) |  |  |
Issuance of common stock in connection with prior acquisition (in shares) |  |  | 23,000 |  |  |  |
Issuance of common stock in connection with prior acquisition | 1,843 |  |  | 1,843 |  |  |
Share-based compensation expense | 16,865 |  |  | 16,865 |  |  |
Other comprehensive income (loss) | (1,140) |  |  |  | (1,140) |  |
Net loss | (11,477) |  |  |  |  | (11,477) |
Common stock, ending balance (in shares) at Sep. 30, 2019 |  |  | 120,669,000 |  |  |  |
Beginning balance at Sep. 30, 2019 | $ 468,512 |  | $ 121 | 894,660 | (1,758) | (424,511) |
Common stock, beginning balance (in shares) at Dec. 31, 2019 | 121,583,501 |  | 121,584,000 |  |  |  |
Beginning balance at Dec. 31, 2019 | $ 498,829 | $ (88) | $ 122 | 916,095 | (1,096) | (416,292) | $ (88)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |
Equity component of convertible senior notes, net of issuance costs | $ 237,462 |  |  | 237,462 |  |  |
Purchase of convertible senior notes capped call | (103,400) |  |  | (103,400) |  |  |
Equity component related to conversions of 2023 convertible senior notes | (345,552) |  |  | (345,552) |  |  |
Issuance of common stock upon conversion of 2023 convertible senior notes (in shares) |  |  | 4,182,000 |  |  |  |
Issuance of common stock upon conversion of 2023 convertible senior notes | 327,141 |  | $ 4 | 327,137 |  |  |
Proceeds from capped call related to conversions of 2023 convertible senior notes | 57,414 |  |  | 57,414 |  |  |
Issuance of common stock upon exercise of stock options and ESPP (in shares) |  |  | 778,000 |  |  |  |
Issuance of common stock upon exercise of stock options and ESPP | 9,234 |  | $ 1 | 9,233 |  |  |
Net issuance of common stock for settlement of RSUs (in shares) |  |  | 2,110,000 |  |  |  |
Net issuance of common stock for settlement of equity awards | (65,222) |  | $ 2 | (65,224) |  |  |
Share-based compensation expense | 59,409 |  |  | 59,409 |  |  |
Other comprehensive income (loss) | 2,429 |  |  |  | 2,429 |  |
Net loss | $ (32,264) |  |  |  |  | (32,264) |
Common stock, ending balance (in shares) at Sep. 30, 2020 | 128,654,401 |  | 128,654,000 |  |  |  |
Beginning balance at Sep. 30, 2020 | $ 645,392 |  | $ 129 | 1,092,574 | 1,333 | (448,644) |
Common stock, beginning balance (in shares) at Jun. 30, 2020 |  |  | 124,123,000 |  |  |  |
Beginning balance at Jun. 30, 2020 | 498,378 |  | $ 124 | 907,908 | 1,850 | (411,504) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Equity component of convertible senior notes, net of issuance costs | 237,462 |  |  | 237,462 |  |  |
Purchase of convertible senior notes capped call | (103,400) |  |  | (103,400) |  |  |
Equity component related to conversions of 2023 convertible senior notes | (345,552) |  |  | (345,552) |  |  |
Issuance of common stock upon conversion of 2023 convertible senior notes (in shares) |  |  | 4,182,000 |  |  |  |
Issuance of common stock upon conversion of 2023 convertible senior notes | 327,141 |  | $ 4 | 327,137 |  |  |
Proceeds from capped call related to conversions of 2023 convertible senior notes | 57,414 |  |  | 57,414 |  |  |
Issuance of common stock upon exercise of stock options and ESPP (in shares) |  |  | 106,000 |  |  |  |
Issuance of common stock upon exercise of stock options and ESPP | 1,197 |  | $ 1 | 1,196 |  |  |
Net issuance of common stock for settlement of RSUs (in shares) |  |  | 243,000 |  |  |  |
Net issuance of common stock for settlement of equity awards | (11,120) |  | $ 0 | (11,120) |  |  |
Share-based compensation expense | 21,529 |  |  | 21,529 |  |  |
Other comprehensive income (loss) | (517) |  |  |  | (517) |  |
Net loss | $ (37,140) |  |  |  |  | (37,140) |
Common stock, ending balance (in shares) at Sep. 30, 2020 | 128,654,401 |  | 128,654,000 |  |  |  |
Beginning balance at Sep. 30, 2020 | $ 645,392 |  | $ 129 | $ 1,092,574 | $ 1,333 | $ (448,644) |

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