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Investments - Financial Information of Weichai Ballard (Details) - USD ($)
$ in Thousands
 12 Months Ended
Nov. 13, 2018
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of joint ventures [line items]        
Current assets   $ 1,229,186 $ 854,315  
Current liabilities   (83,159) (52,091)  
Carrying amount of investment   70,292 27,566  
Net loss   114,233 51,377  
Corporate share of net loss   $ 16,140 $ 12,557  
Weichai Ballard JV        
Disclosure of joint ventures [line items]        
Proportion of ownership interest in joint venture 49.00% 49.00% 49.00%  
Net assets   $ 33,320 $ 35,746  
Carrying amount of investment   28,982 27,561 $ 21,642
Corporate share of net loss   16,084 12,495  
Weichai Ballard JV | Weichai Ballard JV        
Disclosure of joint ventures [line items]        
Current assets   104,907 102,083  
Non-current assets   2,339 178  
Current liabilities   (36,385) (26,701)  
Non-current liabilities   (2,861) (2,610)  
Net assets   68,000 72,950  
Incorporation costs   324 324  
Elimination of unrealized profit on downstream sales, net of sale to third party   (4,662) (8,509)  
Carrying amount of investment   28,982 27,561  
Revenue   38,260 15,765  
Net loss   32,825 25,499  
Corporate share of net loss   $ 16,084 $ 12,495