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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, 2018 | Dec. 31, 2017
Synergy Ballard JVCo |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Percentage ownership interest |  | 10.00% | 10.00% |
Synergy Ballard JVCo | Joint venture |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Trade and other receivables |  |  | $ 481 | $ 1,415
Investments |  |  | 0 | 676
Deferred revenue |  |  | 2,021 | 2,973
Revenues |  |  | $ 17,547 | 30,916
Weichai Ballard JV |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Percentage ownership interest | 49.00% |  | 49.00% |
Weichai Ballard JV | Associates |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Trade and other receivables |  |  | $ 1,123 | 0
Investments |  |  | 13,989 | 0
Deferred revenue |  |  | 8,875 | 0
Revenues |  |  | $ 1,248 | $ 0

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