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	$ 227	$ 551	$ 0
State	587	(21)	811
Foreign	322	220	262
Total	1,136	750	1,073
Deferred:
Federal	(4,114)	(1,819)	(1,320)
State	(866)	8	68
Foreign	(342)	267	395
Total	(5,322)	(1,544)	(857)
Total income tax (benefit) expense	$ (4,186)	$ (794)	$ 216