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Significant accounting policies (Details) ¥ in Thousands, $ in Thousands |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 13, 2018 CNY (¥) board_seat | Nov. 13, 2018 USD ($) board_seat | Mar. 31, 2017 CNY (¥) | Mar. 31, 2017 USD ($) | Jan. 10, 2017 | Jan. 05, 2017 USD ($) | Jan. 04, 2017 | Sep. 26, 2016 CNY (¥) | Sep. 26, 2016 USD ($) | Jul. 19, 2016 | Jan. 18, 2010 | Feb. 28, 2019 CNY (¥) | Feb. 28, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments from changes in ownership interests in subsidiaries that do not result in loss of control |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 47
Internally generated fuel cell intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles, useful life (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |
Patents, know-how and in-process research & development | Bottom of range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles, useful life (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |
Patents, know-how and in-process research & development | Top of range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles, useful life (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 years |
ERP management reporting software system |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles, useful life (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 years |
Trademarks and service marks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles, useful life (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |
Domain names |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles, useful life (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |
Customer base and relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles, useful life (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |
Acquired non-compete agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles, useful life (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |
Building under finance lease |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment useful lives |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |
Computer equipment | Bottom of range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment useful lives |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |
Computer equipment | Top of range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment useful lives |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 years |
Furniture and fixtures | Bottom of range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment useful lives |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |
Furniture and fixtures | Top of range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment useful lives |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 years |
Furniture and fixtures under finance lease |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment useful lives |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |
Production and test equipment | Bottom of range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment useful lives |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years |
Production and test equipment | Top of range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment useful lives |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |
Production and test equipment under finance lease |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment useful lives |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |
Synergy Ballard JVCo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture |  |  |  |  |  |  |  | 10.00% | 10.00% |  |  |  |  | 10.00% |
Other cash payments to acquire interests in joint ventures, classified as investing activities |  |  | ¥ 6,700 | $ 971 |  |  |  |  |  |  |  |  |  |  |
Capital contribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 972
Synergy Ballard JVCo | Synergy Ballard JVCo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture |  |  |  |  |  |  |  | 90.00% | 90.00% |  |  |  |  |  |
Other cash payments to acquire interests in joint ventures, classified as investing activities |  |  |  |  |  |  |  | ¥ 60,300 | $ 9,000 |  |  |  |  |  |
Guangzhou Ballard Power Systems Co., Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  | 100.00% | 100.00%
Ballard Hong Kong Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  | 100.00% | 100.00%
Protonex Technology Corporation (renamed Ballard Unmanned Systems Inc. as of January 1, 2019) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00%
Ballard Services Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00%
Ballard Fuel Cell Systems Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00%
Ballard Power Systems Europe A/S |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  | 100.00% | 57.00% |  |  |  |  |  |  | 100.00% | 100.00%
Payments from changes in ownership interests in subsidiaries that do not result in loss of control |  |  |  |  |  | $ 47 |  |  |  |  |  |  |  | $ 47 |
Ballard Power Systems Europe A/S | Dansk Industri Invest A/S |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  |  |  |  |  |  | 43.00% |  |  |  |
Ballard Power Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00%
Weichai Ballard JV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture | 49.00% | 49.00% |  |  |  |  |  |  |  |  |  |  |  | 49.00% |
Expected contributions to acquire interests in joint venture | ¥ 539,000 | $ 78,400 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash contribution term | 4 years | 4 years |  |  |  |  |  |  |  |  |  |  |  | 4 years |
Other cash payments to acquire interests in joint ventures, classified as investing activities | ¥ 98,000 | $ 14,286 |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contribution |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,286 | $ 0
Number of board seats held | board_seat | 2 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of board seats | board_seat | 5 | 5 |  |  |  |  |  |  |  |  |  |  |  |  |
Weichai Ballard JV | Weichai Power |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture | 51.00% | 51.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Expected contributions to acquire interests in joint venture | ¥ 561,000 | $ 81,600 |  |  |  |  |  |  |  |  |  |  |  |  |
Other cash payments to acquire interests in joint ventures, classified as investing activities | ¥ | ¥ 102,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of board seats held | board_seat | 3 | 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Weichai Ballard JV | Capital Contribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contribution |  |  |  |  |  |  |  |  |  |  |  | ¥ 98,000 | $ 14,500 |  |

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