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Income Taxes - Reconciliation of the Company's Effective Income Tax Rate to the Federal Statutory Rate (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Federal income tax at the statutory rate | $ 435 | $ 5,902 | $ 5,518
State income taxes, net of federal benefit | 526 | (215) | 339
Difference between statutory and foreign tax rates | 43 | 7 | (560)
Permanent differences | 1,139 | 725 | 300
Executive compensation limitation | 7,596 | 1,167 | 0
Research and development | (4,911) | (6,908) | (2,380)
Return to provision adjustment | (9) | 1,780 | 23
Change in liability for unrecognized tax benefits | 1,191 | 1,768 | 7
Excess stock-based compensation benefit | (4,999) | (8,907) | (1,819)
Change in valuation allowance | 368 | 1,984 | 1,949
Tax effects of intercompany transactions | 16 | 1,004 | (277)
Adjustments to deferred tax assets, net resulting from enactment of new tax law | 0 | 0 | 7,601
Other | (207) | 592 | (147)
Provision for income taxes | $ 1,188 | $ (1,101) | $ 10,554
Effective tax rate | 57.40% | (3.90%) | 66.90%

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