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Stock based compensation - Common stock available under 2021 Incentive Plan (Details) - shares
3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Stock Options      
Stock based compensation      
Options granted (3,770,399)    
Restricted stock units      
Stock based compensation      
RSU's granted (546,795)    
2021 Incentive Plan      
Stock based compensation      
Beginning balance 5,786,358    
Shares reserved for issuance 2,954,788 2,750,276 2,750,276
Options and RSUs forfeited / cancelled 439,718    
Ending balance 4,863,670 5,786,358  
2021 Incentive Plan | Stock Options      
Stock based compensation      
Options granted (3,770,399)    
2021 Incentive Plan | Restricted stock units      
Stock based compensation      
RSU's granted (546,795)