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Subsequent events (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 09, 2021
Nov. 30, 2021
Nov. 30, 2020
Subsequent Event [Line Items]      
Proceeds from Contributions from Affiliates     $ 31.0
RSUs      
Subsequent Event [Line Items]      
Granted   0  
Subsequent Event | Stock option | Director      
Subsequent Event [Line Items]      
Granted (in shares) 350,000    
Subsequent Event | Stock option | Employee      
Subsequent Event [Line Items]      
Granted (in shares) 1,734,500    
Vested immediately (in shares) 578,166    
Subsequent Event | RSUs | Employee      
Subsequent Event [Line Items]      
Vested immediately (in shares) 391,332    
Granted 648,600    
Outstanding grants 257,268    
Subsequent Event | DSUs. | Director      
Subsequent Event [Line Items]      
Granted 144,200