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Income Taxes - Statutory Federal Income Tax (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Federal provision at statutory tax rate (34%) $ (182) $ (154) $ 65
Federal tax rate 34.00% 34.00% 34.00%
State and local taxes, net of federal benefit $ (40) $ (30) $ 12
Other (1,695) (1,255) (645)
Benefit (provision) for income taxes $ (1,917) $ (1,439) $ (568)