Acquisition of HyPulsion (Details) - USD ($) $ in Thousands |
Aug. 26, 2015 |
Jul. 31, 2015 |
Sep. 30, 2016 |
Dec. 31, 2015 |
|---|---|---|---|---|
| Business Combination, Goodwill [Abstract] | ||||
| Total goodwill recognized | $ 8,838 | $ 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 |