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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Income Taxes [Abstract]      
Income tax expense $ 7 $ 2  
Net change in valuation allowance 3,342 $ 2,214  
Valuation allowance carried against net deferred tax assets 33,000   $ 30,000
Federal [Member]      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards $ 59,000    
Operating loss carryforwards, expiration dates Dec. 31, 2027    
State [Member]      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards $ 37,000    
Operating loss carryforwards, expiration dates Dec. 31, 2016