Income Taxes - Income Taxes Provision (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal, current	$ 0	$ 0
Federal, deferred	(5,763)	18,646
Federal, total	(5,763)	18,646
State, current	7	5
State, deferred	(651)	231
State, total	(644)	236
Foreign, current	405	519
Foreign, deferred	(703)	(1,880)
Foreign, total	(298)	(1,361)
Valuation allowance	5,609	(16,962)
Tax provision	$ (1,096)	$ 559