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Related party transactions - Transactions with Related Parties (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Nov. 13, 2018 | Sep. 26, 2016 | Dec. 31, 2021 | Dec. 31, 2020
Synergy Ballard JVCo |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in joint venture |  | 10.00% | 10.00% | 10.00%
Synergy Ballard JVCo | Joint venture |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Trade and other receivables |  |  | $ 99 | $ 99
Investments |  |  | 0 | 0
Deferred revenue |  |  | 16 | 304
Revenues |  |  | $ 3,441 | $ 8,232
Weichai Ballard JV |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in joint venture | 49.00% |  | 49.00% | 49.00%
Weichai Ballard JV | Associates |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Trade and other receivables |  |  | $ 10,794 | $ 17,465
Investments |  |  | 28,982 | 27,561
Deferred revenue |  |  | 2,730 | 4,712
Revenues |  |  | $ 35,239 | $ 44,855

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- Definition The amounts receivable resulting from related party transactions. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2021-01-01 -Paragraph 20 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2021-en-r&anchor=para_20&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2021-01-01 -Paragraph 18 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2021-en-r&anchor=para_18_b&doctype=Standard -URIDate 2021-03-24 + Details
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