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Financial instruments - Narrative (Details)
 3 Months Ended 12 Months Ended
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