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Commitments and contingencies (Details)
€ in Thousands, £ in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2021
EUR (€)
Dec. 31, 2021
GBP (£)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2021
EUR (€)
Dec. 31, 2021
GBP (£)
Dec. 31, 2021
CAD ($)
Disclosure of other provisions [line items]                
Capital commitments $ 22,800,000     $ 22,800,000        
Royalty related to UTC, revenue obligations                
Disclosure of other provisions [line items]                
Expiration period (years)       15 years        
Royalty payments       $ 0 $ 0      
Royalty obligation, percentage       2.00%        
Maximum royalty expense 4,613,000     $ 4,613,000       $ 5,351
Royalty expense       $ 0        
Royalty of other revenue obligations                
Disclosure of other provisions [line items]                
Royalty obligation, percentage       2.00%        
Maximum royalty expense 1,896,000     $ 1,896,000       $ 2,200
Royalty expense       $ 0        
HyCap Fund | Initial Contribution                
Disclosure of other provisions [line items]                
Capital commitments | £             £ 25,000  
Capital contributions 7,610,000   £ 5,665          
CleanH2 Fund | Initial Contribution                
Disclosure of other provisions [line items]                
Capital commitments | €           € 30,000    
Capital contributions $ 337,000 € 300 £ 300