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Convertible Bridge Note with Related Party (Details) - USD ($)
$ in Thousands
1 Months Ended 2 Months Ended 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2015
Related party transactions      
Gain on extinguishment     $ 91
6.0% Convertible promissory notes      
Related party transactions      
Gain on extinguishment $ 91    
Bridge Notes Purchase Agreement | Investors | 6.0% Convertible promissory notes      
Related party transactions      
Amount issued   $ 5,000  
Stated interest rate   6.00%