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Organization and significant accounting policies - Narrative (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 19, 2023
USD ($)
$ / shares
shares
Sep. 30, 2023
USD ($)
Sep. 30, 2023
USD ($)
reporting_unit
reportable_segment
Dec. 31, 2022
USD ($)
Sep. 20, 2022
USD ($)
Short-Term Debt [Line Items]          
Number of reportable segments | reportable_segment     1    
Number of reporting units | reporting_unit     1    
Cash, cash equivalents, and available-for-sale securities   $ 42,200,000 $ 42,200,000 $ 64,100,000  
Subsequent Event | Casdin Securities Purchase Agreement          
Short-Term Debt [Line Items]          
Number of shares sold (in shares) | shares 927,165        
Shares sold, price per share (in dollars per share) | $ / shares $ 11.19        
Consideration received on sale of stock $ 10,374,976.35        
Supplier Concentration Risk | Supply Purchase | One Supplier          
Short-Term Debt [Line Items]          
Concentration risk, percent   14.00% 12.00%    
Supplier Concentration Risk | Accounts Payable | One Supplier          
Short-Term Debt [Line Items]          
Concentration risk, percent     19.00% 23.00%  
2022 term loan 3          
Short-Term Debt [Line Items]          
Maximum borrowing capacity   $ 10,000,000 $ 10,000,000   $ 30,000,000