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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Deficit | Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2018 | $ 479,079 | $ 14 | $ 1,948,300 | $ (1,468,863) | $ (372)
Issuance of common stock from exercise of stock options |  |  | 4,176 |  |
Stock-based compensation |  |  | 19,826 |  |
Net loss | (85,304) |  |  | (85,304) |
Ending balance at Mar. 31, 2019 | 418,356 | 14 | 1,972,302 | (1,554,167) | 207
Other comprehensive (loss) income | 579 |  |  |  |
Beginning balance at Dec. 31, 2019 | 699,135 | 15 | 2,402,945 | (1,704,122) | 297
Issuance of common stock from exercise of stock options |  |  | 3,754 |  |
Stock-based compensation |  |  | 22,288 |  |
Net loss | (88,023) |  |  | (88,023) |
Ending balance at Mar. 31, 2020 | 638,382 | $ 15 | $ 2,428,987 | $ (1,792,145) | $ 1,525
Other comprehensive (loss) income | $ 1,228 |  |  |  |

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