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Subsequent Event (Details) - Weichai Ballard JV ¥ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2019 CNY (¥) | Feb. 28, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |
Capital contribution |  |  | $ 14,286 | $ 0
Capital Contribution |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |
Capital contribution | ¥ 98,000 | $ 14,500 |  |

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