Income Taxes - Components of Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
Federal	$ 357	$ (1,155)	$ 158
State	0	14	(34)
Foreign	105	120	1,108
Total current	462	(1,021)	1,232
Deferred:
Federal	0	4,143	(7,260)
State	0	548	(959)
Foreign	1,202	87	(1,091)
Total deferred	1,202	4,778	(9,310)
Income tax (benefit) expense	$ 1,664	$ 3,757	$ (8,078)