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Summary of significant accounting policies - Cash and restricted cash (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
item
Dec. 31, 2022
USD ($)
item
Dec. 31, 2021
USD ($)
Accounting Policies [Abstract]      
Cash investment term 90 days    
Cash classified as restricted | $ $ 300 $ 300 $ 300
Number of standby letters of credit | item 2 2