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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment | Common Stock | Additional Paid-In Capital | Additional Paid-In Capital Cumulative Effect, Period of Adoption, Adjustment | Accumulated Other Comprehensive (Loss) Income | Accumulated Deficit | Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2019 |  |  | 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 | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |  |
Issuance of common stock upon exercise of stock options and ESPP (in shares) |  |  | 672,000 |  |  |  |  |
Issuance of common stock upon exercise of stock options and ESPP | $ 8,037 |  |  | 8,037 |  |  |  |
Net share settlement of equity awards (in shares) |  |  | 1,867,000 |  |  |  |  |
Net share settlement of equity awards | (54,102) |  | $ 2 | (54,104) |  |  |  |
Share-based compensation expense | 37,880 |  |  | 37,880 |  |  |  |
Other comprehensive income | 2,946 |  |  |  |  | 2,946 |  |
Net income | 4,876 |  |  |  |  |  | 4,876 |
Ending 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) |
Beginning balance (in shares) at Mar. 31, 2020 |  |  | 123,543,000 |  |  |  |  |
Beginning balance at Mar. 31, 2020 | 462,927 |  | $ 124 | 890,258 |  | (5,362) | (422,093) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Issuance of common stock upon exercise of stock options and ESPP (in shares) |  |  | 312,000 |  |  |  |  |
Issuance of common stock upon exercise of stock options and ESPP | 5,372 |  |  | 5,372 |  |  |  |
Net share settlement of equity awards (in shares) |  |  | 268,000 |  |  |  |  |
Net share settlement of equity awards | (7,268) |  |  | (7,268) |  |  |  |
Share-based compensation expense | 19,546 |  |  | 19,546 |  |  |  |
Other comprehensive income | 7,212 |  |  |  |  | 7,212 |  |
Net income | 10,589 |  |  |  |  |  | 10,589 |
Ending 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) |
Beginning balance (in shares) at Dec. 31, 2020 | 129,343,524 |  | 129,344,000 |  |  |  |  |
Beginning balance at Dec. 31, 2020 | $ 609,635 | $ (378,138) | $ 129 | 1,030,577 | $ (465,006) | 1,530 | (422,601) | 86,868
Beginning balance (Accounting Standards Update 2020-06) at Dec. 31, 2020 |  |  |  |  | $ (465,000) |  |  | $ 86,900
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Issuance of common stock in connection with equity offering, net of offering costs | 1,091,466 |  | $ 11 | 1,091,455 |  |  |  |
Issuance of common stock in connection with equity offering, net of offering costs (in shares) |  |  | 10,975,000 |  |  |  |  |
Equity component of convertible senior notes, net of issuance costs | (236,920) |  |  | (236,920) |  |  |  |
Issuance of common stock upon conversion of 2023 convertible senior notes (in shares) |  |  | 2,983,000 |  |  |  |  |
Issuance of common stock upon conversions of 2023 notes | 235,521 |  | $ 3 | 235,518 |  |  |  |
Net proceeds from capped call related to conversions of 2023 notes and 2025 notes | 67,769 |  |  | 67,769 |  |  |  |
Issuance of common stock upon exercise of stock options and ESPP (in shares) |  |  | 164,000 |  |  |  |  |
Issuance of common stock upon exercise of stock options and ESPP | 5,265 |  |  | 5,265 |  |  |  |
Net share settlement of equity awards (in shares) |  |  | 1,155,000 |  |  |  |  |
Net share settlement of equity awards | (74,640) |  | $ 2 | (74,642) |  |  |  |
Share-based compensation expense | 52,839 |  |  | 52,839 |  |  |  |
Other comprehensive income | (2,500) |  |  |  |  | (2,500) |  |
Net income | $ (32,415) |  |  |  |  |  | (32,415) |
Ending balance (in shares) at Jun. 30, 2021 | 144,621,425 |  | 144,621,000 |  |  |  |  |
Beginning balance at Jun. 30, 2021 | $ 1,337,882 |  | $ 145 | 1,706,855 |  | (970) | (368,148) |
Beginning balance (in shares) at Mar. 31, 2021 |  |  | 141,317,000 |  |  |  |  |
Beginning balance at Mar. 31, 2021 | 1,243,343 |  | $ 141 | 1,645,352 |  | (1,238) | (400,912) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Equity component of convertible senior notes, net of issuance costs | (225,615) |  |  | (225,615) |  |  |  |
Issuance of common stock upon conversion of 2023 convertible senior notes (in shares) |  |  | 2,857,000 |  |  |  |  |
Issuance of common stock upon conversions of 2023 notes | 224,284 |  | $ 3 | 224,281 |  |  |  |
Net proceeds from capped call related to conversions of 2023 notes and 2025 notes | 44,192 |  |  | 44,192 |  |  |  |
Issuance of common stock upon exercise of stock options and ESPP (in shares) |  |  | 120,000 |  |  |  |  |
Issuance of common stock upon exercise of stock options and ESPP | 4,919 |  |  | 4,919 |  |  |  |
Net share settlement of equity awards (in shares) |  |  | 327,000 |  |  |  |  |
Net share settlement of equity awards | (15,465) |  | $ 1 | (15,466) |  |  |  |
Share-based compensation expense | 29,192 |  |  | 29,192 |  |  |  |
Other comprehensive income | 268 |  |  |  |  | 268 |  |
Net income | $ 32,764 |  |  |  |  |  | 32,764 |
Ending balance (in shares) at Jun. 30, 2021 | 144,621,425 |  | 144,621,000 |  |  |  |  |
Beginning balance at Jun. 30, 2021 | $ 1,337,882 |  | $ 145 | $ 1,706,855 |  | $ (970) | $ (368,148) |

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