Income Taxes - Reconciliation of Income Taxes Computed at Statutory Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Federal provision at statutory rate	$ 2,392	$ 5,887	$ 4,466
U.S./foreign tax rate differential	(1,842)	1	(991)
Foreign non-deductible expenses	743	(479)	1,556
Foreign tax provision	336	296	361
State taxes, net of federal benefit	(171)	556	1,958
State tax rate change, net of federal benefit	541	32	(159)
Change in uncertain tax positions	114	236	(150)
Change in valuation allowance	(1,858)	3,283	(2,538)
Tax credits	(104)	(283)	(91)
Share-based compensation	(108)	459	377
Other	6	(230)	342
Provision for income taxes	$ 49	$ 9,758	$ 5,131