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Stockholders' equity - Common stock (Details) - shares
Sep. 30, 2022
Dec. 31, 2021
Common stock    
Number of shares reserved for future issuance (in shares) 12,418,052 9,199,512
Share-based payments | Stock options    
Common stock    
Number of shares reserved for future issuance (in shares) 10,524,780 8,342,429
Share-based payments | Restricted stock units    
Common stock    
Number of shares reserved for future issuance (in shares) 1,870,682 817,609
Warrants    
Common stock    
Number of shares reserved for future issuance (in shares) 22,590 39,474