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Significant accounting policies (Details)
9 Months Ended
Sep. 30, 2022
subsidiary
shares
Sep. 30, 2021
shares
Oct. 18, 2021
shares
Accounting Policies [Abstract]      
Number of wholly-owed subsidiaries | subsidiary 1    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Anti-dilutive common shares excluded from calculation of loss per common share (in shares)   34,300,000  
Number of common shares issued upon conversion of preferred shares     22,833,922
Number of wholly-owed subsidiaries | subsidiary 1    
Employee Stock Option      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Anti-dilutive common shares excluded from calculation of loss per common share (in shares) 15,900,000