Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
State									$ 4	$ 49	$ (89)
Foreign									318	144	68
Total current									322	193	(21)
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Foreign									0	2,678	1,894
Total deferred									0	2,678	1,894
Provision for income taxes	$ 194	$ 31	$ 36	$ 61	$ 2,783	$ (39)	$ 77	$ 50	$ 322	$ 2,871	$ 1,873