Income Taxes - Reconciliation of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Benefit from for income taxes at U.S. Federal statutory rate	$ (28,150)	$ (5,624)	$ (7,628)
State taxes	150	120	5,368
Differential in rates on foreign earnings	11,741	1,584	4,311
Non-deductible amortization expense	617	947	3,138
Change in valuation allowance	4,465	2,230	26,053
Change in liabilities for uncertain tax positions	(960)	(1,083)	(8,126)
Non-deductible stock-based compensation	1,480	1,398	1,665
Research and development tax credits	(129)	(178)	(841)
Non-deductible meals and entertainment	441	395	361
Non-deductible acquisition cost	0	457	0
Adjustments related to tax positions taken during prior years	(163)	(781)	0
Adjustments made under intercompany transactions	1,779
Withholding tax	457
Other	156	128	152
Total provision for (benefit from) income taxes	$ (8,116)	$ (407)	$ 24,453