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Summary of significant accounting policies - Leases (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Jan. 01, 2022
Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease right-of-use assets $ 40,823   $ 0
Present value of lease liabilities 49,166    
Deferred rent $ 0   $ 2,602
Cumulative Effect, Period of Adoption, Adjustment      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease right-of-use assets   $ 37,216  
Present value of lease liabilities   40,070  
Deferred rent   430  
Deferred credit   $ 2,424