Income Taxes - Statutory Federal Income Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal provision at statutory tax rate (21% for 2019 and 2018 and 34% for 2017)	$ (73)	$ (65)	$ (182)
State and local taxes, net of federal benefit	(10)	(11)	(40)
Other	(1,296)	(1,652)	(1,695)
Benefit (provision) for income taxes	$ (1,379)	$ (1,728)	$ (1,917)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	34.00%