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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ (DEFICIT) EQUITY (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Income | Accumulated Deficit
--- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2018 |  | 22,466 |  |  |
Beginning balance at Dec. 31, 2018 | $ 51,975 | $ 7 | $ 371,463 | $ 1,992 | $ (321,487)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of common stock options (in shares) |  | 111 |  |  |
Exercise of common stock options | 1,348 |  | 1,348 |  |
Stock-based compensation |  |  | 4,797 |  |
Settlement of restricted stock (in shares) |  | 0 |  |  |
Vesting of common stock warrants | 4,797 |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures |  | 157 |  |  |
Stock Issued During Period, Value, Restricted Stock Award, Gross |  | $ 0 | 0 |  |
Other comprehensive income | 77 |  |  | 77 |
Ending balance (in shares) at Jun. 30, 2019 |  | 22,828 |  |  |
Ending balance at Jun. 30, 2019 | 46,538 | $ 7 | 378,773 | 2,069 | (334,311)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Stock Issued During Period, Value, Employee Stock Purchase Plan | 1,165 | $ 94 | 1,165 |  |
Net Income (Loss) Attributable to Parent | (12,824) |  |  |  | (12,824)
Beginning balance (in shares) at Mar. 31, 2019 |  | 22,570 |  |  |
Beginning balance at Mar. 31, 2019 | 47,177 | $ 7 | 373,351 | 1,620 | (327,801)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of common stock options (in shares) |  | 80 |  |  |
Exercise of common stock options | 1,175 |  | 1,175 |  |
Stock-based compensation |  |  | 3,082 |  |
Settlement of restricted stock (in shares) |  | 0 |  |  |
Vesting of common stock warrants | 3,082 |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures |  | 84 |  |  |
Stock Issued During Period, Value, Restricted Stock Award, Gross |  | $ 0 | 0 |  |
Other comprehensive income | 449 |  |  | 449 |
Ending balance (in shares) at Jun. 30, 2019 |  | 22,828 |  |  |
Ending balance at Jun. 30, 2019 | 46,538 | $ 7 | 378,773 | 2,069 | (334,311)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Stock Issued During Period, Value, Employee Stock Purchase Plan | 1,165 | $ 94 | 1,165 |  |
Net Income (Loss) Attributable to Parent | (6,510) |  |  |  | (6,510)
Beginning balance (in shares) at Dec. 31, 2019 |  | 26,547 |  |  |
Beginning balance at Dec. 31, 2019 | $ 143,267 | $ 8 | 480,578 | 1,312 | (338,631)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of common stock options (in shares) | 275 | 275 |  |  |
Exercise of common stock options | $ 5,426 |  | $ 5,426 |  |
Stock Issued During Period, Shares, Warrants Exercised In Period | 0 | 9 | 0 |  |
Stock-based compensation | $ 12,347 |  | $ 12,347 |  |
Settlement of restricted stock (in shares) |  | 416 |  |  |
Other comprehensive income | 1,402 |  |  | 1,402 |
Ending balance (in shares) at Jun. 30, 2020 |  | 27,275 |  |  |
Ending balance at Jun. 30, 2020 | 130,465 | $ 8 | 499,663 | 2,714 | (371,920)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net Income (Loss) Attributable to Parent | (33,289) |  |  |  | (33,289)
Beginning balance (in shares) at Mar. 31, 2020 |  | 26,824 |  |  |
Beginning balance at Mar. 31, 2020 | 138,358 | $ 8 | 487,903 | 2,609 | (352,162)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of common stock options (in shares) |  | 114 |  |  |
Exercise of common stock options | 2,281 |  | 2,281 |  |
Stock-based compensation | 8,167 |  | 8,167 |  |
Settlement of restricted stock (in shares) |  | 309 |  |  |
Other comprehensive income | 105 |  |  | 105 |
Ending balance (in shares) at Jun. 30, 2020 |  | 27,275 |  |  |
Ending balance at Jun. 30, 2020 | 130,465 | $ 8 | 499,663 | $ 2,714 | (371,920)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Stock Issued During Period, Value, Employee Stock Purchase Plan | 1,312 | $ 28 | $ 1,312 |  |
Net Income (Loss) Attributable to Parent | $ (19,758) |  |  |  | $ (19,758)

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