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Income Taxes - Reconciliation of Provision for Income Taxes to Statutory Federal Rate (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Expected federal income tax at statutory rate | $ 5,951 | $ 3,635 | $ 2,662
State income taxes, net of federal tax effect | 1,293 | 417 | 284
Tax impact of foreign activity | 57 | (105) | (115)
Nondeductible executive compensation | 902 | 530 | 159
Nondeductible expenses | 351 | 268 | 213
Change in valuation allowance | (4) | 16 | (35)
Change in state deferred rate | 38 | (134) | (67)
Research and development credit | (1,843) | (227) | (261)
Tax impact of Tax Cuts and Jobs Act |  | 6,796 |
Tax impact of stock activity | (2,438) | (925) |
Other | 161 | 71 | (85)
Total provision for income taxes | $ 4,468 | $ 10,342 | $ 2,755

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