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Intangible assets - Acquired (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | $ 8,285 | $ 17,950 | $ 18,083
Internally generated fuel cell intangible assets | Internally generated |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 1,199 | 1,690 |
ERP management reporting software system | Internally generated |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 4,825 | 5,738 |
Intellectual property acquired from UTC |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 1,417 | 1,864 |
Intellectual property acquired from H2 Logic A/S |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 43 | 129 |
Intellectual property acquired from Protonex |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 787 | 8,507 |
Intellectual property acquired by Ballard Power Systems Europe | Patents, know-how and in-process research & development |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | $ 14 | $ 22 |

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