Summary of Siginificant Accounting Policies (Details) - USD ($) $ in Millions |
9 Months Ended | ||
|---|---|---|---|
Sep. 30, 2015 |
Jul. 31, 2015 |
Dec. 31, 2014 |
|
| Summary of Significant Accounting Policies | |||
| Minimum term of extended warranty contracts sold | 5 years | ||
| Maximum term of extended warranty contracts sold | 10 years | ||
| Unbilled amounts | $ 0.5 | $ 1.0 | |
| Minimum | |||
| Research and Development. | |||
| Cost Sharing Percentages of research and development contracts | 30.00% | ||
| Maximum | |||
| Research and Development. | |||
| Cost Sharing Percentages of research and development contracts | 50.00% | ||
| Axane, S.A. | HyPulsion | |||
| Joint Venture | |||
| Ownership interest percentage | 100.00% |