Income Taxes - Components of Income Tax Expense (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ 0	$ 0
State and local	20,000	16,000
Current Federal, State and Local Tax Expense (Benefit)	20,000	16,000
Deferred:
Federal	(566,000)	8,000
State and local	(99,000)	1,000
Deferred Federal, State and Local, Tax Expense (Benefit)	(665,000)	9,000
Total income tax (benefit) expense	$ (645,000)	$ 25,000