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Fair Value Measurement (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Warrant liability December 31, 2014 $ 1,910  
Decrease in fair value of warrant liability (1,081) $ (1,127)
Warrant liability December 31, 2014 1,649 1,910
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Warrant liability December 31, 2014 1,910  
New warrant liabilities 820  
Decrease in fair value of warrant liability (1,081)  
Warrant liability December 31, 2014 $ 1,649 $ 1,910