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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Common Stock | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Total
--- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2020 | $ 606,224 | $ 357,803 | $ (5,452) | $ 958,575
Beginning balance (in shares) at Dec. 31, 2020 | 55,623 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income |  | 10,958 |  | 10,958
Other comprehensive income (loss) |  |  | (1,730) | (1,730)
Stock-based compensation expense | $ 3,310 |  |  | 3,310
Options exercised | $ 5,897 |  |  | 5,897
Options exercised (in shares) | 291 |  |  |
Issuance of common stock under Employee Stock Purchase Plan | $ 263 |  |  | 263
Issuance of common stock under Employee Stock Purchase Plans (in shares) | 5 |  |  |
Shares issued from time-vested restricted stock units (in shares) | 25 |  |  |
Shares surrendered in exchange for payment of payroll tax liabilities | $ (488) |  |  | (488)
Shares surrendered in exchange for payment of payroll tax liabilities (in shares) | (9) |  |  |
Shares surrendered in exchange for exercise of stock options | $ (93) |  |  | (93)
Shares surrendered in exchange for exercise of stock options (in shares) | (2) |  |  |
Ending balance at Mar. 31, 2021 | $ 615,113 | 368,761 | (7,182) | 976,692
Ending balance (in shares) at Mar. 31, 2021 | 55,933 |  |  |
Beginning balance at Dec. 31, 2021 | $ 641,533 | 406,257 | (7,991) | $ 1,039,799
Beginning balance (in shares) at Dec. 31, 2021 | 56,570 |  |  | 56,570
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income |  | 10,545 |  | $ 10,545
Other comprehensive income (loss) |  |  | 1,338 | 1,338
Stock-based compensation expense | $ 4,212 |  |  | 4,212
Options exercised | $ 1,320 |  |  | 1,320
Options exercised (in shares) | 52 |  |  |
Issuance of common stock under Employee Stock Purchase Plan | $ 320 |  |  | 320
Issuance of common stock under Employee Stock Purchase Plans (in shares) | 5 |  |  |
Shares issued from time-vested restricted stock units (in shares) | 44 |  |  |
Shares surrendered in exchange for payment of payroll tax liabilities | $ (1,015) |  |  | (1,015)
Shares surrendered in exchange for payment of payroll tax liabilities (in shares) | (16) |  |  |
Ending balance at Mar. 31, 2022 | $ 646,370 | $ 416,802 | $ (6,653) | $ 1,056,519
Ending balance (in shares) at Mar. 31, 2022 | 56,655 |  |  | 56,655

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