Income Taxes - Components of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
Federal	$ 0	$ (30)	$ 0
State	(14)	(14)	(20)
Foreign	286	(1,319)	(254)
Total current tax benefit (expense)	272	(1,363)	(274)
Deferred:
State	0	0	2,042
Foreign	3,920	2,838	3,107
Total deferred benefit	3,920	2,838	5,149
Total benefit for income taxes	$ 4,192	$ 1,475	$ 4,875