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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, 2018 | 32,558 |  |  |  |
Balance at Dec. 31, 2018 | $ 33 | $ 565,116 | $ (157,260) | $ 448 | $ 408,337
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income |  |  | 17,034 |  | 17,034
Foreign currency translation adjustments |  |  |  | (444) | (444)
Change in pension obligation |  |  |  | (262) | (262)
Exercise of stock options (in shares) | 775 |  |  |  |
Exercise of stock options | $ 1 | 5,104 |  |  | 5,105
Issuance of shares under Employee Stock Purchase Plan (in shares) | 54 |  |  |  |
Issuance of shares under Employee Stock Purchase Plan |  | 1,016 |  |  | 1,016
Issuance of common shares on restricted stock units, net of shares withheld (in shares) | 250 |  |  |  |
Issuance of restricted common shares |  | (1,633) |  |  | (1,633)
Stock-based compensation expense |  | 8,018 |  |  | 8,018
Repurchase of common stock (in shares) | (1,052) |  |  |  |
Repurchase of common stock | $ (1) | (17,743) |  |  | (17,744)
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 |  |  | 49,982 |  | 49,982
Foreign currency translation adjustments |  |  |  | 3,427 | 3,427
Change in pension obligation |  |  |  | 266 | 266
Exercise of stock options (in shares) | 1,001 |  |  |  |
Exercise of stock options | $ 1 | 8,418 |  |  | 8,419
Issuance of shares under Employee Stock Purchase Plan (in shares) | 41 |  |  |  |
Issuance of shares under Employee Stock Purchase Plan |  | 1,011 |  |  | 1,011
Issuance of common shares on restricted stock units, net of shares withheld (in shares) | 364 |  |  |  |
Issuance of restricted common shares |  | (3,915) |  |  | (3,915)
Stock-based compensation expense |  | 10,485 |  |  | 10,485
Repurchase of common stock (in shares) | (358) |  |  |  |
Repurchase of common stock |  | (5,775) | (1,725) |  | (7,500)
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 |  |  | 98,650 |  | 98,650
Foreign currency translation adjustments |  |  |  | (1,881) | (1,881)
Change in pension obligation |  |  |  | 211 | 211
Exercise of stock options (in shares) | 396 |  |  |  |
Exercise of stock options |  | 3,687 |  |  | 3,687
Issuance of shares under Employee Stock Purchase Plan (in shares) | 26 |  |  |  |
Issuance of shares under Employee Stock Purchase Plan |  | 1,179 |  |  | 1,179
Issuance of common shares on restricted stock units, net of shares withheld (in shares) | 326 |  |  |  |
Issuance of restricted common shares |  | (6,564) |  |  | (6,564)
Stock-based compensation expense |  | 12,067 |  |  | 12,067
Repurchase of common stock (in shares) | (1,141) |  |  |  |
Repurchase of common stock | $ (1) | (20,588) | (29,403) |  | (49,992)
Balance (in shares) at Dec. 31, 2021 | 33,240 |  |  |  |
Balance at Dec. 31, 2021 | $ 33 | $ 559,883 | $ (22,722) | $ 1,765 | $ 538,959

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