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Summary of significant accounting policies - Deferred Contract Costs (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Accounting Policies [Abstract]        
Total amortization of contract costs $ 4,200,000 $ 3,100,000 $ 12,100,000 $ 9,000,000
Impairment losses $ 0 $ 0 $ 0 $ 0