Income Taxes - Components of Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ (60)	$ (107)	$ (140)
State and local	(1,668)	(1,810)	(1,299)
NOL utilized	0	0	59
Deferred:
Federal	0	0	(44)
State and local	0	0	(15)
Benefit (provision) for income taxes	$ (1,728)	$ (1,917)	$ (1,439)