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Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2023 | Sep. 30, 2024 USD ($) Customer | Sep. 30, 2023 | Dec. 31, 2023 USD ($)
Schedule Of Accounting Policies [Line Items] |  |  |  |  |
Number of service providers accounted for more than 10% of revenue | Customer |  |  | 2 |  |
Number of service providers accounted for more than 10% of accounts receivable | Customer |  |  | 2 |  |
Restructuring charges | $ 0 |  | $ 1,157 |  |
One-time severance charges |  |  | 3,037 |  |
Customer funds held in trust accounts | 21,925 |  | 21,925 |  | $ 6,269
Deferred compensation plan assets | 2,823 |  | 2,823 |  | 1,866
Deferred compensation plan liabilities | $ 2,429 |  | $ 2,429 |  | $ 2,398
ASU No.2023-01 |  |  |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |  |  |
Change in accounting principle, ASU, Adoption date | Jan. 01, 2024 |  | Jan. 01, 2024 |  |
Change in accounting principle, ASU, adopted [true false] | true |  | true |  |
Change in accounting principle, ASU, Immaterial effect [true false] | true |  | true |  |
Total Revenues | Customer Concentration Risk | One Service Provider |  |  |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |  |  |
Concentration risk percentage | 25.00% | 14.00% | 22.00% | 18.00% |
Total Revenues | Customer Concentration Risk | Second Service Provider |  |  |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |  |  |
Concentration risk percentage | 21.00% | 31.00% | 24.00% | 29.00% |
Accounts Receivable | Customer Concentration Risk | One Service Provider |  |  |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |  |  |
Concentration risk percentage |  |  | 41.00% |  | 12.00%
Accounts Receivable | Customer Concentration Risk | Second Service Provider |  |  |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |  |  |
Concentration risk percentage |  |  | 7.00% |  | 38.00%

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