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Statements of Stockholders' Equity - USD ($) $ in Thousands | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Accumulated Deficit | Total
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2018 | $ 563 | $ 845,366 | $ (971) | $ (323,277) | $ 521,681
Balance (in shares) at Dec. 31, 2018 | 56,279,542 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Issuance of common stock upon exercise of stock awards | $ 5 | 9,264 |  |  | 9,269
Issuance of common stock upon exercise of stock awards (in shares) | 543,887 |  |  |  |
Issuance of restricted stock units (in shares) | 11,311 |  |  |  |
Issuance of common stock under the Employee Stock Purchase Plan | $ 1 | 1,392 |  |  | 1,393
Issuance of common stock under the Employee Stock Purchase Plan (in shares) | 67,561 |  |  |  |
Comprehensive income (loss) |  |  | 2,132 | 26,875 | 29,007
Stock-based compensation |  | 31,851 |  |  | 31,851
Balance at Dec. 31, 2019 | $ 569 | 887,873 | 1,161 | (296,402) | 593,201
Balance (in shares) at Dec. 31, 2019 | 56,902,301 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Issuance of common stock upon exercise of stock awards | $ 9 | 16,608 |  |  | 16,617
Issuance of common stock upon exercise of stock awards (in shares) | 858,470 |  |  |  |
Issuance of restricted stock units | $ 1 | (1) |  |  |
Issuance of restricted stock units (in shares) | 62,355 |  |  |  |
Issuance of common stock under the Employee Stock Purchase Plan | $ 1 | 1,426 |  |  | 1,427
Issuance of common stock under the Employee Stock Purchase Plan (in shares) | 50,318 |  |  |  |
Comprehensive income (loss) |  |  | (1,087) | (69,333) | (70,420)
Stock-based compensation |  | 31,619 |  |  | 31,619
Balance at Dec. 31, 2020 | $ 580 | 937,525 | 74 | (365,735) | 572,444
Balance (in shares) at Dec. 31, 2020 | 57,873,444 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Sale of common stock | $ 7 | 28,913 |  |  | 28,920
Sale of common stock (in shares) | 748,062 |  |  |  |
Issuance of common stock upon exercise of stock awards | $ 5 | 12,276 |  |  | 12,281
Issuance of common stock upon exercise of stock awards (in shares) | 520,240 |  |  |  |
Issuance of restricted stock units | $ 2 | (2) |  |  |
Issuance of restricted stock units (in shares) | 151,555 |  |  |  |
Issuance of common stock under the Employee Stock Purchase Plan | $ 1 | 1,836 |  |  | 1,837
Issuance of common stock under the Employee Stock Purchase Plan (in shares) | 62,257 |  |  |  |
Comprehensive income (loss) |  |  | (1,584) | 82,631 | 81,047
Stock-based compensation |  | 36,975 |  |  | 36,975
Balance at Dec. 31, 2021 | $ 595 | $ 1,017,523 | $ (1,510) | $ (283,104) | $ 733,504
Balance (in shares) at Dec. 31, 2021 | 59,355,558 |  |  |  |

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