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Goodwill and intangible assets - Summary of Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Dec. 31, 2022
Goodwill And Intangible Assets [Line Items]      
Gross carrying amount $ 53,087 $ 52,687  
Accumulated amortization (31,499) (26,672)  
Net carrying amount 21,588 26,015 $ 32,932
Goodwill 47,739 47,739 $ 47,739
Customer relationships      
Goodwill And Intangible Assets [Line Items]      
Gross carrying amount 43,500 43,500  
Accumulated amortization (28,113) (23,947)  
Net carrying amount $ 15,387 19,553  
Customer relationships | Minimum      
Goodwill And Intangible Assets [Line Items]      
Useful life (months) 84 months    
Customer relationships | Maximum      
Goodwill And Intangible Assets [Line Items]      
Useful life (months) 120 months    
Non-compete agreements      
Goodwill And Intangible Assets [Line Items]      
Useful life (months) 60 months    
Gross carrying amount $ 303 303  
Accumulated amortization (303) (303)  
Net carrying amount 0 0  
Trademarks, trade names, and domain names      
Goodwill And Intangible Assets [Line Items]      
Gross carrying amount 9,284 8,884  
Accumulated amortization (3,083) (2,422)  
Net carrying amount $ 6,201 $ 6,462  
Trademarks, trade names, and domain names | Minimum      
Goodwill And Intangible Assets [Line Items]      
Useful life (months) 60 months    
Trademarks, trade names, and domain names | Maximum      
Goodwill And Intangible Assets [Line Items]      
Useful life (months) 120 months