Income Taxes - Reconciliation of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Benefit from for income taxes at U.S. Federal statutory rate	$ (1,384)	$ (3,559)	$ (29,648)
Differential in rates on foreign earnings	2,422	4,299	15,920
Tax Reform tax rate reduction	0	0	14,527
Change in valuation allowance	(923)	1,449	(2,834)
Change in liabilities for uncertain tax positions	(411)	(250)	(2,009)
Non-deductible stock-based compensation	553	1,363	1,934
Permanent Differences	(698)	1,096	380
Adjustments related to tax positions taken during prior years	(403)	184	(473)
Tax refund	0	(305)	(834)
Other	172	(190)	1,285
Total provision for (benefit from) income taxes	$ (672)	$ 4,087	$ (1,752)