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Fair value of financial instruments and investments - Marketable Securities, Balance Sheet Disclosures (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Marketable securities, Less Than 12 Months $ 1,625 $ 12,424
Marketable securities, More Than 12 Months   10,186
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Marketable securities, Less Than 12 Months   12,424
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Marketable securities, Less Than 12 Months $ 1,625  
Marketable securities, More Than 12 Months   $ 10,186