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Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Current:      
State $ 574 $ 576 $ 600
Total 574 576 600
Income tax provision $ 574 $ 576 $ 600
Reconciliation of effective tax rate and the U.S. federal statutory income tax rate      
Taxes at statutory U.S. federal income tax rate (as a percent) 35.00% 35.00% 35.00%
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent (35.00%) (35.00%) (35.00%)
State and local income taxes, net of federal tax benefit (as a percent) 0.40% 0.30% 0.40%
Change in valuation allowance (as a percent) 8.82% 6.39% 3.49%
Other differences, net (as a percent) (8.82%) (6.39%) (3.49%)
Effective tax rate (as a percent) 0.40% 0.30% 0.40%
Deferred Tax Assets, Gross [Abstract]      
Deferred income $ 2,862 $ 2,724  
Other 115 206  
Tax loss carry forwards 27,941 17,266  
Deferred tax assets, gross 30,918 20,196  
Valuation allowance $ (30,918) $ (20,196)  
Percentage of valuation allowance provided 100.00% 100.00%  
Tax Credit Carryforward, Amount $ 71,283