Income Taxes - Summary of Components of the Provision for Income Tax (Benefit) Expense From Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal	$ 212	$ 177
State and local, net of federal income tax benefit	65	68
Foreign	2,299	780
Total	2,576	1,025
Deferred:
Federal	(8,804)	(31,714)
State and local, net of federal income tax benefit	(243)	6,031
Total	(9,047)	(25,683)
Total income tax (benefit) expense, from continuing operations	$ (6,471)	$ (24,658)