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Financial instruments - Narrative (Details) |  | 3 Months Ended | 12 Months Ended |  |  |
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Jun. 17, 2021 USD ($) shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) $ / $ | Dec. 31, 2021 USD ($) $ / $ | Dec. 31, 2020 USD ($) $ / $ | Dec. 31, 2021 CAD ($) | Dec. 31, 2021 | Dec. 31, 2021 $ / $ | Dec. 31, 2021 $ / $ | Jun. 16, 2021 USD ($) | Dec. 31, 2020 $ / $
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment income |  |  | $ 4,043,000 |  |  |  | $ 1,436,000 |  |  |  |  |  |
Mark-to-market gain (loss) on financial assets |  |  | (9,024,000) |  |  |  | 0 |  |  |  |  |  |
Impairment loss on trade receivables |  |  | 54,000 |  |  |  | 310,000 |  |  |  |  |  |
Net impairment loss on trade receivables |  |  | 54,000 |  |  |  | 60,000 |  |  |  |  |  |
Impairment loss allowance |  |  | 0 |  |  |  | 250,000 |  |  |  |  |  |
Green Hydrogen |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Mark-to-market gain (loss) on financial assets |  |  | 1,422,000 |  |  |  | $ 0 |  |  |  |  |  |
Forsee Power |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Mark-to-market gain (loss) on financial assets |  |  | (10,474,000) |  |  |  |  |  |  |  |  |  |
Ballard Power Systems Europe A/S |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares received in sale of stock transaction | shares | 259,551 |  |  |  |  |  |  |  |  |  |  |  |
Ballard Power Systems Europe A/S | Green Hydrogen |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold of an investment (in shares) | shares |  | 69,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of investment |  | $ 336,000 |  |  |  |  |  |  |  |  |  |  |
Bottom of range |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Forecasted default rate |  |  |  | 0.008 |  |  |  |  |  |  |  |  |
Top of range |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Forecasted default rate |  |  |  | 0.012 |  |  |  |  |  |  |  |  |
Currency risk |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Exposure to risk holding Canadian denominated cash and cash equivalents, percentage (up to) |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Exposure to risk holding Canadian dollar net expenditures, percentage (up to) |  |  |  | 50.00% |  |  |  |  |  |  |  |  |
Average price of hedging instrument (CDN per USD) |  |  |  |  |  |  |  | 1.26 |  | 1.26 |  |  |
January 1, 2021 Opening rate |  |  |  |  |  |  | 1.274 |  |  |  |  |  | 0.785
December 31, 2021 Closing rate |  |  |  |  |  |  |  |  |  | 1.271 | 0.787 |  |
Fiscal 2021 Average rate |  |  |  |  | 1.254 | 0.798 |  |  |  |  |  |  |
Reasonably possible change in risk variable, percent |  |  |  |  |  |  |  |  | 10.00% |  |  |  |
Increase in the corresponding risk variable on income |  |  | 7,871,000 |  |  |  |  |  |  |  |  |  |
Interest rate risk |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reasonably possible change in risk variable, percent |  |  |  |  |  |  |  |  | 1.00% |  |  |  |
Decrease in the corresponding risk variable on investment income |  | $ 11,239,000 | 11,239,000 | $ 11,239,000 | $ 11,239,000 | $ 11,239,000 |  |  |  |  |  |  |
Equity investments | Ballard Power Systems Europe A/S |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Current investments | $ 1,681,000 |  |  |  |  |  |  |  |  |  |  | $ 5,000 |
Investment income | $ 1,676,000 |  | 1,422,000 |  |  |  |  |  |  |  |  |  |
Mark-to-market gain (loss) on financial assets |  |  | $ (254,000) |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | Currency risk |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Risk exposure associated with instruments sharing characteristic |  |  |  |  |  |  |  | $ 73,524,000 |  |  |  |  |
Foreign exchange contracts | Currency risk |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Risk exposure associated with instruments sharing characteristic |  |  |  |  |  |  |  | $ 26,500,000 |  |  |  |  |

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