Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
U.S. pre-tax income (loss)	$ (17,744)	$ (20,183)
Foreign pre-tax income (loss)	(16,743)	1,653
Loss before income tax provision	(34,487)	(18,530)
Current income tax:
U.S.	0	0
State	0	0
Foreign	820	212
Deferred income tax:
U.S.	(272)	105
State	0	0
Foreign	(101)	32
Total income tax	$ 447	$ 349