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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Difference between income tax provision computed at the statutory Federal income tax rate and financial statement income tax |  |  |
Provision at Federal rate of 21% | $ 12,764 | $ 21,199 | $ 17,925
State income taxes, net of Federal impact | 2,079 | 4,882 | 3,430
Research and experimentation credits | (1,560) | (2,062) | (2,705)
Stock award vesting | (1,355) | (538) | (540)
Tax uncertainties | (227) | 69 | (403)
Section 162(m) compensation limitation | 2,326 | 1,610 | 4,494
Foreign rate differential | 571 | 592 | 462
Valuation allowance for deferred tax assets | 638 | 1,427 | 1,002
Withholding tax | 1,948 | 2,305 | 2,572
Other impact of foreign operations | 422 | (468) | 621
Statutory rate change | 303 | (299) | 71
Convertible debt premium | (1,017) | 0 | 0
Other | (171) | (102) | (284)
Total income tax provision | $ 16,721 | $ 28,615 | $ 26,645

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