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Income Taxes - Reconciliation of Provision for Income Taxes to Statutory Federal Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	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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