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Investments - Financial Information of Weichai Ballard (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Nov. 13, 2018 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of joint ventures [line items] |  |  |  |
Current assets |  | $ 1,229,186 | $ 854,315 |
Current liabilities |  | (83,159) | (52,091) |
Carrying amount of investment |  | 70,292 | 27,566 |
Net loss |  | 114,233 | 51,377 |
Corporate share of net loss |  | $ 16,140 | $ 12,557 |
Weichai Ballard JV |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Proportion of ownership interest in joint venture | 49.00% | 49.00% | 49.00% |
Net assets |  | $ 33,320 | $ 35,746 |
Carrying amount of investment |  | 28,982 | 27,561 | $ 21,642
Corporate share of net loss |  | 16,084 | 12,495 |
Weichai Ballard JV | Weichai Ballard JV |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Current assets |  | 104,907 | 102,083 |
Non-current assets |  | 2,339 | 178 |
Current liabilities |  | (36,385) | (26,701) |
Non-current liabilities |  | (2,861) | (2,610) |
Net assets |  | 68,000 | 72,950 |
Incorporation costs |  | 324 | 324 |
Elimination of unrealized profit on downstream sales, net of sale to third party |  | (4,662) | (8,509) |
Carrying amount of investment |  | 28,982 | 27,561 |
Revenue |  | 38,260 | 15,765 |
Net loss |  | 32,825 | 25,499 |
Corporate share of net loss |  | $ 16,084 | $ 12,495 |

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