Income Taxes - Schedule of Income Tax (Benefit) Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current tax expense (benefit):
Federal	$ 0	$ (86)	$ 26
State and local	30	20	35
Foreign	(157)	42	272
Total current tax (benefit) expense	(127)	(24)	333
Deferred tax expense:
Federal	0	0	0
State and local	0	0	0
Foreign	65	(61)	(46)
Total deferred tax expense (benefit)	65	(61)	(46)
Total income tax (benefit) expense	$ (62)	$ (85)	$ 287