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Summary of significant accounting policies - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Significant Accounting Policies [Line Items]          
Accounts receivable, allowance for credit losses $ 314,000   $ 314,000   $ 575,000
Payments pursuant to tax receivable agreement     2,822,000 $ 216,000  
Revolving Credit Facility          
Significant Accounting Policies [Line Items]          
Outstanding amount drawn under revolving credit facility 178,400,000   178,400,000    
Available credit under agreement 45,000,000   $ 45,000,000    
Tax Receivables Agreement | Related Party          
Significant Accounting Policies [Line Items]          
Percentage of cash savings required to pay     85.00%    
Payments pursuant to tax receivable agreement $ 0 $ 0 $ 2,800,000 $ 200,000