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Composition of Certain Financial Statement Captions (Deferred Contract Costs) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Items Included in Consolidated Statement of Financial Condition [Abstract] |  |  |  |  |
Deferred contract costs | $ 38,518,000 |  | $ 38,518,000 |  | $ 37,928,000
Capitalized contract cost, amount capitalized during period | $ 2,243,000 | $ 4,648,000 | 7,212,000 | $ 9,710,000 |
Amortization of deferred contract costs |  |  | 6,622,000 | 8,156,000 |
Accelerated amortization of deferred contract costs |  |  |  | $ 1,784,000 |
Capitalized contract cost impairment |  |  | $ 0 |  |

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- Definition Capitalized Contract Cost, Accelerated Amortization + References No definition available. + Details
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- Definition Capitalized Contract Cost, Amount Capitalized During Period + References No definition available. + Details
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- References No definition available. + Details
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- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479483/340-40-50-3 + Details
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- Definition Amount of impairment loss for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479483/340-40-50-3 + Details
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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479483/340-40-50-3 + Details
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