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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 |  |  | 49,982 |  | 49,982
Foreign currency translation adjustments |  |  |  | 3,427 | 3,427
Change in pension obligation, net of tax |  |  |  | 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 common shares on restricted stock units, net of shares withheld |  | (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, net of tax |  |  |  | 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 common shares on restricted stock units, net of shares withheld |  | (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
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income |  |  | 183,079 |  | 183,079
Foreign currency translation adjustments |  |  |  | (4,058) | (4,058)
Change in pension obligation, net of tax |  |  |  | 325 | 325
Exercise of stock options (in shares) | 103 |  |  |  |
Exercise of stock options |  | 1,247 |  |  | 1,247
Issuance of shares under Employee Stock Purchase Plan (in shares) | 29 |  |  |  |
Issuance of shares under Employee Stock Purchase Plan |  | 1,662 |  |  | 1,662
Issuance of common shares on restricted stock units, net of shares withheld (in shares) | 291 |  |  |  |
Issuance of common shares on restricted stock units, net of shares withheld |  | (9,907) |  |  | (9,907)
Stock-based compensation expense |  | 13,444 |  |  | 13,444
Repurchase of common stock (in shares) | (888) |  |  |  |
Repurchase of common stock |  | (16,030) | (41,465) |  | (57,495)
Balance (in shares) at Dec. 31, 2022 | 32,775 |  |  |  |
Balance at Dec. 31, 2022 | $ 33 | $ 550,299 | $ 118,892 | $ (1,968) | $ 667,256

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