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Composition of Certain Financial Statement Captions - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Items Included in Consolidated Statement of Financial Condition [Abstract] |  |  |  |  |
Depreciation | $ 8,341,000 | $ 9,197,000 | $ 25,097,000 | $ 26,509,000 |
Deferred contract costs | 42,527,000 |  | 42,527,000 |  | $ 40,221,000
Capitalized contract cost, amount capitalized during period | $ 5,326,000 | $ 2,243,000 | 10,237,000 | 7,212,000 |
Amortization of deferred contract costs |  |  | 7,931,000 | $ 6,622,000 |
Capitalized contract cost impairment |  |  | $ 0 |  |

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