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Summary of Significant Accounting Policies - Additional Information (Details) | 3 Months Ended | 9 Months Ended |  |  |  |
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Sep. 30, 2025 USD ($) institution shares | Jun. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) institution shares | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jul. 16, 2021 $ / shares | Jun. 16, 2021 $ / shares shares
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance of bad debt | $ 2,781,000 | $ 1,638,000 | $ 858,000 | $ 2,756,000 | $ 2,781,000 | $ 858,000 | $ 1,243,000 | $ 8,748,000 |  |
Equity securities without readily determinable fair value | 0 |  |  |  | 0 |  | 0 |  |  |
Amortization of right-of-use lease assets | 0 |  | 0 |  | 0 | 0 |  |  |  |
Capitalized computer software, net | 23,900,000 |  |  |  | 23,900,000 |  | 23,100,000 |  |  |
Capitalized computer software, amortization | 2,900,000 |  | 3,100,000 |  | 9,100,000 | 8,400,000 |  |  |  |
Goodwill, impairment loss | 0 |  | 0 |  | 0 | 0 |  |  |  |
Impairment charges | 0 |  | 0 |  | 0 | 0 |  |  |  |
Operating lease, impairment loss | 0 |  | 0 |  | 0 | 0 |  |  |  |
Lease, cost | 1,500,000 |  | 1,700,000 |  | 4,700,000 | 5,800,000 |  |  |  |
Right-of-use assets | 12,802,000 |  |  |  | 12,802,000 |  | 14,695,000 |  |  |
Payments for lease termination |  |  |  | 100,000 |  |  |  |  |  |
Gain on lease termination |  | $ 100,000 |  |  | 0 | 109,000 |  |  |  |
Derecognizing on right of use asset |  |  |  | 200,000 |  |  |  |  |  |
Derecognition on lease liability |  |  |  | $ 400,000 |  |  |  |  |  |
Contra rent expense | $ 0.0 |  | 200,000 |  | $ 900,000 | 1,300,000 |  |  |  |
Tax receivable agreement liabilities as percent of expected benefit | 85.00% |  |  |  | 85.00% |  |  |  |  |
Tax receivable agreement, percent recorded in additional paid-in capital | 15.00% |  |  |  | 15.00% |  |  |  |  |
Tax receivable agreement, liability | $ 2,500,000 |  |  |  | $ 2,500,000 |  | $ 4,400,000 |  |  |
Change in tax receivable agreement liability | (1,550,000) |  | 548,000 |  | (460,000) | 1,486,000 |  |  |  |
Cost of revenues (exclusive of depreciation and amortization shown separately below) | 2,118,000 |  | 2,182,000 |  | 6,639,000 | 6,729,000 |  |  |  |
Advertising expense | 3,400,000 |  | 2,000,000.0 |  | $ 7,000,000.0 | 8,300,000 |  |  |  |
Requisite service period |  |  |  |  | 2 years |  |  |  |  |
Defined contribution cost | 500,000 |  | 400,000 |  | $ 1,700,000 | 1,400,000 |  |  |  |
Provision for income taxes | $ 13,000 |  | $ 21,000 |  | $ 22,000 | $ 72,000 |  |  |  |
Number of financial institutions with cash balance exceeding FDIC limit | institution | 4 |  |  |  | 4 |  |  |  |  |
Irvine Corporate Headquarters Lease |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Lease renewal term |  |  | 5 years |  |  |  |  |  |  |
Weighted average discount rate |  |  | 11.50% |  |  | 11.50% |  |  |  |
Lease liability |  |  | $ 3,300,000 |  |  | $ 3,300,000 |  |  |  |
Right-of-use assets |  |  | 3,300,000 |  |  | 3,300,000 |  |  |  |
Minimum | PRSUs outstanding |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Target award |  |  |  |  | 0.00% |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Employer matching contribution, percent of match |  |  |  |  | 3.50% |  |  |  |  |
Maximum | PRSUs outstanding |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Target award |  |  |  |  | 200.00% |  |  |  |  |
Sales Discount |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Cost of revenues (exclusive of depreciation and amortization shown separately below) | $ 2,200,000 |  | $ 1,400,000 |  | $ 6,000,000 | $ 4,000,000 |  |  |  |
Class A Common Stock, $0.0001 par value per share |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Right to purchase shares (in shares) | shares |  |  |  |  |  |  |  |  |  | 1
Exercise price of warrant (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 11.50 | $ 11.50
Minimum requirement for cash settlement as percent of stockholders |  |  |  |  |  |  |  |  |  | 50.00%
Payment to continuing members as percent of amount of tax benefit | 85.00% |  |  |  | 85.00% |  |  |  |  |
Public Warrants |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Origination warrants (in shares) | shares | 12,499,993 |  |  |  | 12,499,993 |  |  |  |  |
Warrants outstanding (in shares) | shares | 12,499,973 |  |  |  | 12,499,973 |  |  |  |  |
Private Placement Warrants |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Origination warrants (in shares) | shares | 7,000,000 |  |  |  | 7,000,000 |  |  |  |  |
Warrants outstanding (in shares) | shares | 7,000,000 |  |  |  | 7,000,000 |  |  |  |  |
Computer equipment |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Property and equipment, useful life | 3 years |  |  |  | 3 years |  |  |  |  |
Furniture and fixtures |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Property and equipment, useful life | 7 years |  |  |  | 7 years |  |  |  |  |
Software technology |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Property and equipment, useful life | 3 years |  |  |  | 3 years |  |  |  |  |
Enhancements |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Property and equipment, useful life | 3 years |  |  |  | 3 years |  |  |  |  |

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