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Stock-based compensation - Employee Stock Purchase Plan (Details) - Employee Stock Purchase Plan 2021 - shares
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Jun. 30, 2024
Stock based compensation      
Shares authorized for issuance 564,071    
Percentage of common stock outstanding 1.00%    
Increase in common stock reserved   550,055  
Shares available for grant     954,522