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Deferred revenue (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Deferred revenue    
Beginning Balance $ 4,588 $ 8,030
Additions to deferred revenue 17,291 21,790
Revenue recognized during the year (10,247) (25,232)
Ending Balance $ 11,632 $ 4,588