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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Common Stock | Retained Earnings Reclassify upon adoption of ASU | Retained Earnings | Accumulated Other Comprehensive Income (Loss) Reclassify upon adoption of ASU | Accumulated Other Comprehensive Income (Loss) | Reclassify upon adoption of ASU | Total
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2017 | $ 353,392 |  | $ 321,408 |  | $ 1,534 |  | $ 676,334
Beginning balance (in shares) at Dec. 31, 2017 | 50,248 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) |  |  | 42,017 |  |  |  | 42,017
Other comprehensive income (loss) |  |  |  |  | (3,567) |  | (3,567)
Stock-based compensation expense | $ 6,117 |  |  |  |  |  | 6,117
Options exercised | $ 10,634 |  |  |  |  |  | 10,634
Options exercised (in shares) | 690 |  |  |  |  |  |
Issuance of common stock under Employee Stock Purchase Plan | $ 1,087 |  |  |  |  |  | 1,087
Issuance of common stock under Employee Stock Purchase Plans (in shares) | 22 |  |  |  |  |  |
Issuance of common stock, net of offering costs | $ 205,030 |  |  |  |  |  | 205,030
Issuance of common stock, net of offering costs (in shares) | 4,025 |  |  |  |  |  |
Shares surrendered in exchange for payment of payroll tax liabilities | $ (2,616) |  |  |  |  |  | (2,616)
Shares surrendered in exchange for payment of payroll tax liabilities (in shares) | (49) |  |  |  |  |  |
Shares surrendered in exchange for exercise of stock options | $ (2,261) |  |  |  |  |  | $ (2,261)
Shares surrendered in exchange for exercise of stock options (in shares) | (43) |  |  |  |  |  | (43)
Ending balance (ASU 2016-02) at Dec. 31, 2018 |  | $ 93 |  |  |  | $ 93 |
Ending balance (ASU 2018-02) at Dec. 31, 2018 |  | (748) |  | $ 748 |  |  |
Ending balance at Dec. 31, 2018 | $ 571,383 |  | 363,425 |  | (2,033) |  | $ 932,775
Ending balance (in shares) at Dec. 31, 2018 | 54,893 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) |  |  | 5,451 |  |  |  | 5,451
Other comprehensive income (loss) |  |  |  |  | (4,009) |  | (4,009)
Stock-based compensation expense | $ 9,382 |  |  |  |  |  | 9,382
Options exercised | $ 4,930 |  |  |  |  |  | 4,930
Options exercised (in shares) | 288 |  |  |  |  |  |
Issuance of common stock under Employee Stock Purchase Plan | $ 1,415 |  |  |  |  |  | 1,415
Issuance of common stock under Employee Stock Purchase Plans (in shares) | 35 |  |  |  |  |  |
Shares surrendered in exchange for exercise of stock options | $ (93) |  |  |  |  |  | $ (93)
Shares surrendered in exchange for exercise of stock options (in shares) | (3) |  |  |  |  |  | (3)
Ending balance (ASU 2016-13) at Dec. 31, 2019 |  | $ (575) |  |  |  | $ (575) |
Ending balance at Dec. 31, 2019 | $ 587,017 |  | 368,221 |  | (5,294) |  | $ 949,944
Ending balance (in shares) at Dec. 31, 2019 | 55,213 |  |  |  |  |  | 55,213
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) |  |  | (9,843) |  |  |  | $ (9,843)
Other comprehensive income (loss) |  |  |  |  | (158) |  | (158)
Stock-based compensation expense | $ 13,433 |  |  |  |  |  | 13,433
Options exercised | $ 6,948 |  |  |  |  |  | $ 6,948
Options exercised (in shares) | 442 |  |  |  |  |  | 442
Issuance of common stock under Employee Stock Purchase Plan | $ 1,159 |  |  |  |  |  | $ 1,159
Issuance of common stock under Employee Stock Purchase Plans (in shares) | 30 |  |  |  |  |  |
Shares surrendered in exchange for payment of payroll tax liabilities | $ (866) |  |  |  |  |  | (866)
Shares surrendered in exchange for payment of payroll tax liabilities (in shares) | (23) |  |  |  |  |  |
Shares surrendered in exchange for exercise of stock options | $ (1,467) |  |  |  |  |  | $ (1,467)
Shares surrendered in exchange for exercise of stock options (in shares) | (39) |  |  |  |  |  | (39)
Ending balance at Dec. 31, 2020 | $ 606,224 |  | $ 357,803 |  | $ (5,452) |  | $ 958,575
Ending balance (in shares) at Dec. 31, 2020 | 55,623 |  |  |  |  |  | 55,623

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