Deferred Engineering Costs - Additional Information (Detail) - USD ($) $ in Thousands |
Sep. 30, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Deferred Costs [Abstract] | ||
| Deferred engineering costs | $ 9,000 | $ 0 |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition The carrying amount of deferred costs. No definition available.
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