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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Income Taxes [Abstract]      
Income tax expense $ 5 $ 7  
Net change in valuation allowance 1,786 $ 3,342  
Valuation allowance carried against net deferred tax assets 46,000   $ 44,000
Federal [Member]      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards $ 78,000    
Operating loss carryforwards, expiration dates Dec. 31, 2027    
State [Member]      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards $ 61,000    
Operating loss carryforwards, expiration dates Dec. 31, 2016