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Total Income Tax Expense Applying U.S. Federal Income Tax Rate (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |
Computed tax expense at statutory federal rates | $ 5,619 | $ 3,874 | $ 3,993
Increase (decrease) in taxes resulting from: |  |  |
State taxes, net of federal income tax benefit | 1,485 | 559 | 1,131
Unrecognized tax benefits | (1,783) | (2,092) | 263
Bargain purchase gain on business acquisition | (35) | (978) |
Income tax credits | (1,206) | (812) | (819)
Foreign tax rate differential | 262 | 2,145 | 341
Stock based compensation | 208 | 377 | 366
Global intangible low-taxed income | 162 |  | 249
Change in valuation allowance | 3,304 |  |
Other | 150 | 7 | (322)
Total | $ 8,166 | $ 3,080 | $ 5,202

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