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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 Dec. 31, 2016 |  | 91,709,000 |  |  |
Beginning balance at Dec. 31, 2016 | $ 221,939 | $ 92 | $ 593,351 | $ (176) | $ (371,328)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock in connection with follow-on offering, net of offering costs, shares |  | 11,500,000 |  |  |
Issuance of common stock in connection with follow-on offering, net of offering costs | 147,609 | $ 12 | 147,597 | 0 | 0
Issuance of common stock upon exercise of stock options and ESPP, shares |  | 3,280,000 |  |  |
Issuance of common stock upon exercise of stock options and ESPP | 23,656 | $ 3 | 23,653 |  |
Net issuance of common stock for settlement of RSUs, shares |  | 3,155,000 |  |  |
Net share settlement of equity awards | (20,112) | $ 3 | (20,115) |  |
Warrant exercises, shares |  | 24,000 |  |  |
Warrant exercises | 0 |  | 0 |  |
Share-based compensation expense | 38,359 |  | 38,359 |  |
Other comprehensive loss | (106) |  |  | (106) |
Net loss | (20,283) |  |  |  | (20,283)
Ending balance at Dec. 31, 2017 | 391,062 | $ 110 | 782,845 | (282) | (391,611)
Ending balance, shares at Dec. 31, 2017 |  | 109,668,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Equity component of convertible senior notes, net of issuance costs | 62,444 |  | 62,444 |  |
Purchase of convertible senior notes capped call | (39,227) |  | (39,227) |  |
Issuance of common stock upon exercise of stock options and ESPP, shares |  | 3,459,000 |  |  |
Issuance of common stock upon exercise of stock options and ESPP | 29,113 | $ 4 | 29,109 |  |
Net issuance of common stock for settlement of RSUs, shares |  | 3,322,000 |  |  |
Net share settlement of equity awards | (49,086) | $ 3 | (49,089) |  |
Warrant exercises, shares |  | 34,000 |  |  |
Warrant exercises | 0 |  | 0 |  |
Repurchase of common stock, shares |  | (983,000) |  |  |
Repurchase of common stock | (20,000) | $ (1) | (19,999) |  |
Share-based compensation expense | 52,030 |  | 52,030 |  |
Other comprehensive loss | (737) |  |  | (737) |
Net loss | (14,888) |  |  |  | (14,888)
Ending balance at Dec. 31, 2018 | $ 410,634 | $ 116 | 818,113 | (1,019) | (406,576)
Ending balance, shares at Dec. 31, 2018 | 115,500,418 | 115,500,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
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) |  |
Issuance of common stock upon exercise of stock options and ESPP, shares |  | 3,276,000 |  |  |
Issuance of common stock upon exercise of stock options and ESPP | 35,097 | $ 4 | 35,093 |  |
Net issuance of common stock for settlement of RSUs, shares |  | 3,248,000 |  |  |
Net share settlement of equity awards | (94,568) | $ 3 | (94,571) |  |
Issuance of common stock in connection with prior acquisition, shares |  | 64,000 |  |  |
Issuance of common stock in connection with prior acquisition | 3,003 |  | 3,003 |  |
Repurchase of common stock, shares |  | (504,000) |  |  |
Repurchase of common stock | (20,000) | $ (1) | (19,999) |  |
Share-based compensation expense | 64,909 |  | 64,909 |  |
Other comprehensive loss | (77) |  |  | (77) |
Net loss | (9,605) |  |  |  | (9,605)
Ending balance at Dec. 31, 2019 | $ 498,829 | $ 122 | $ 916,095 | $ (1,096) | $ (416,292)
Ending balance, shares at Dec. 31, 2019 | 121,583,501 | 121,584,000 |  |  |

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