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Investments - Narrative (Details) € in Thousands, ¥ in Thousands, £ in Thousands, shares in Thousands |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 13, 2018 | Sep. 26, 2016 | Oct. 31, 2021 USD ($) shares | Oct. 31, 2021 EUR (€) shares | Mar. 31, 2017 USD ($) | Mar. 31, 2017 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 EUR (€) | Dec. 31, 2021 GBP (£) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 EUR (€) | Aug. 31, 2021 USD ($) | Aug. 31, 2021 GBP (£)
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in loss of investment in joint venture and associates |  |  |  |  |  |  |  |  |  | $ 16,140,000 |  | $ 12,557,000 |  |  |  |  |  |  |  |  |
Investments |  |  |  |  |  |  | $ 70,292,000 |  |  | 70,292,000 |  | 27,566,000 |  |  |  |  |  |  |  |  |
Synergy Ballard JVCo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in loss of investment in joint venture and associates |  |  |  |  |  |  |  |  |  | $ 56,000 |  | $ 62,000 |  |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture |  | 10.00% |  |  |  |  |  |  |  | 10.00% | 10.00% | 10.00% | 10.00% |  |  |  |  |  |  |  |
Capital contributions |  |  |  |  | $ 971,000 | ¥ 6,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments |  |  |  |  |  |  | 0 |  |  | $ 0 |  | $ 0 |  | $ 0 |  |  |  |  |  |  |
Weichai Ballard JV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in loss of investment in joint venture and associates |  |  |  |  |  |  |  |  |  | $ 16,084,000 |  | $ 12,495,000 |  |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture | 49.00% |  |  |  |  |  |  |  |  | 49.00% | 49.00% | 49.00% | 49.00% |  |  |  |  |  |  |  |
Capital contributions |  |  |  |  |  |  |  |  |  | $ 12,351,000 | ¥ 79,625 | $ 22,515,000 | ¥ 155,575 | 20,944,000 | ¥ 143,325 | $ 14,286,000 | ¥ 98,000 |  |  |  |
Investments |  |  |  |  |  |  | 28,982,000 |  |  | 28,982,000 |  | 27,561,000 |  | $ 21,642,000 |  |  |  |  |  |  |
Weichai Ballard JV | Less than one year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed capital contributions |  |  |  |  |  |  | 9,834,000,000 |  |  | $ 9,834,000,000 |  |  |  |  |  |  |  | ¥ 62,475 |  |  |
Synergy Ballard JVCo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture |  |  |  |  |  |  |  |  |  | 10.00% | 10.00% |  |  |  |  |  |  |  |  |  |
Capital contributions |  |  |  |  |  |  |  |  |  | $ 0 |  | 0 |  |  |  |  |  |  |  |  |
Forsee Power |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture |  |  | 9.77% | 9.77% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contributions |  |  | $ 43,809,000 | € 37,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares purchased (in shares) | shares |  |  | 5,200 | 5,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments |  |  |  |  |  |  | 33,335,000 |  |  | 33,335,000 |  | 0 |  |  |  |  |  |  |  |  |
Foreign exchange gain (loss) and gains (losses) on financial asset at fair value |  |  |  |  |  |  |  |  |  | (10,474,000) |  |  |  |  |  |  |  |  |  |  |
Hydrogen Funds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign exchange gain (loss) and gains (losses) on financial asset at fair value |  |  |  |  |  |  |  |  |  | 2,000 |  |  |  |  |  |  |  |  |  |  |
HyCap Fund |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments |  |  |  |  |  |  | 7,636,000 |  |  | 7,636,000 |  | 0 |  |  |  |  |  |  |  |  |
Committed capital contributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 33,698,000 | £ 25,000
HyCap Fund | Initial Contribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contributions |  |  |  |  |  |  | 7,610,000 |  | £ 5,665 |  |  |  |  |  |  |  |  |  |  |  |
HyCap Fund | Subsequent Contribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contributions |  |  |  |  |  |  | 26,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
CleanH2 Fund |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments |  |  |  |  |  |  | 339,000 |  |  | 339,000 |  | $ 0 |  |  |  |  |  |  |  |  |
Committed capital contributions |  |  |  |  |  |  | 33,978,000 |  |  | $ 33,978,000 |  |  |  |  |  |  |  |  | € 30,000 |  |
CleanH2 Fund | Initial Contribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contributions |  |  |  |  |  |  | $ 337,000 | € 300 | £ 300 |  |  |  |  |  |  |  |  |  |  |  |

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