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Income Taxes - Difference between Benefit from Income Taxes and Amount Computed by Applying Statutory Income Tax Rate to Income Before Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |
Benefits from taxes at statutory rate | $ 2,823 | $ (4,314) | $ (5,620)
Rate differential | (4,416) | 128 | 3,009
Change in valuation reserves | (546) | 22,865 | (2,141)
Nondeductible employee compensation | 5,249 | 6,122 | 5,472
Stock option/RSU windfall (shortfall) | 81 | (3,262) | (14,342)
ISO disqualifying disposition windfall | (219) | (253) | (2,849)
Research and development credits | (1,170) | (6,225) | (1,607)
Tax return to provision adjustments | (8,372) | (138) | (3,222)
Net Operating Loss Carryback |  | (2,465) |
Cumulative translation adjustment | 4,109 | (10,852) | 2,025
Permanent and other | 863 | (4,283) | (443)
Tax reserves | 5,160 | 3,422 | 18,799
Corscianto liquidation |  |  | 1,727
Long-term debt from royalty-bearing instrument |  |  | (644)
Provision for income taxes | $ 3,562 | $ 745 | $ 164

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