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Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Common Stock | Additional Paid-in Capital | Accumulated Deficit | Accumulated Other Comprehensive Income (Loss) | Total
--- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2019 | 32,585 |  |  |  |
Balance at Dec. 31, 2019 | $ 33 | $ 559,878 | $ (140,226) | $ (258) | $ 419,427
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income |  |  | 11,221 |  | 11,221
Foreign currency translation adjustments |  |  |  | (1,112) | (1,112)
Change in pension obligation, net of tax |  |  |  | 57 | 57
Exercise of stock options (in shares) | 540 |  |  |  |
Exercise of stock options | $ 1 | 4,498 |  |  | 4,499
Issuance of shares under Employee Stock Purchase Plan (in shares) | 1 |  |  |  |
Issuance of shares under Employee Stock Purchase Plan |  | 19 |  |  | 19
Issuance of restricted common shares (in shares) | 69 |  |  |  |
Issuance of restricted common shares |  | (1,162) |  |  | (1,162)
Stock-based compensation expense |  | 1,724 |  |  | 1,724
Repurchase of common stock (in shares) | (358) |  |  |  |
Repurchase of common stock | $ (1) | (5,775) | (1,725) |  | (7,501)
Balance (in shares) at Mar. 31, 2020 | 32,837 |  |  |  |
Balance at Mar. 31, 2020 | $ 33 | 559,182 | (130,730) | (1,313) | 427,172
Balance (in shares) at Dec. 31, 2020 | 33,633 |  |  |  |
Balance at Dec. 31, 2020 | $ 34 | 570,102 | (91,969) | 3,435 | 481,602
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income |  |  | 16,480 |  | 16,480
Foreign currency translation adjustments |  |  |  | (1,372) | (1,372)
Change in pension obligation, net of tax |  |  |  | 20 | 20
Exercise of stock options (in shares) | 268 |  |  |  |
Exercise of stock options |  | 2,512 |  |  | 2,512
Issuance of restricted common shares (in shares) | 81 |  |  |  |
Issuance of restricted common shares |  | (2,354) |  |  | (2,354)
Stock-based compensation expense |  | 2,407 |  |  | 2,407
Repurchase of common stock (in shares) | (303) |  |  |  |
Repurchase of common stock |  | (5,468) | (6,167) |  | (11,635)
Balance (in shares) at Mar. 31, 2021 | 33,679 |  |  |  |
Balance at Mar. 31, 2021 | $ 34 | $ 567,199 | $ (81,656) | $ 2,083 | $ 487,660

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