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Subsequent event (Details) - USD ($)
3 Months Ended
Mar. 01, 2023
Feb. 28, 2023
RSUs    
Subsequent Event [Line Items]    
Granted   3,699,297
Subsequent Event    
Subsequent Event [Line Items]    
Accrued salaries and director fees $ 247,000  
Subsequent Event | RSUs | Director    
Subsequent Event [Line Items]    
Granted (in shares) 213,463  
Subsequent Event | DSUs. | Employee    
Subsequent Event [Line Items]    
Granted (in shares) 162,469