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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
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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 |  |

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