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Summary of significant accounting policies - Deferred Contract Costs (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Accounting Policies [Abstract]        
Total amortization of contract costs $ 6,600,000 $ 5,200,000 $ 12,900,000 $ 10,000,000.0
Impairment losses $ 0 $ 0 $ 0 $ 0