Income Taxes - Components of Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal	$ (70)	$ (60)	$ (107)
State and local	(1,309)	(1,668)	(1,810)
Benefit (provision) for income taxes	$ (1,379)	$ (1,728)	$ (1,917)