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Acquisition of HyPulsion (Details) - USD ($)
$ in Thousands
Aug. 26, 2015
Jul. 31, 2015
Mar. 31, 2016
Dec. 31, 2015
Business Combination, Goodwill [Abstract]        
Total goodwill recognized     $ 8,827 $ 8,478
Axane, S.A. | HyPulsion        
Business Acquisition [Line Items]        
Percentage of voting interest acquired   80.00%    
Value of shares of common stock issued   $ 11,500    
Number of shares of common stock issued 1,613,289 4,781,250