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Share-Based Compensation - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Unrecognized pre-tax noncash compensation | $ 28.1 |  | $ 28.1 |  |
ESPP percentage |  |  | 15.00% |  |
Weighted Average Remaining Contractual Term, Grants Vested |  |  | 1 year 1 month 6 days |  |
Employee stock purchase plan expenses | $ 0.2 | $ 0.2 | $ 0.5 | $ 0.5 |
2021 Equity Plan [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Common stock, reserved for future issuance |  |  |  |  | 17,525,000
Share available for issuance | 22,399,150 |  | 22,399,150 |  |
Weighted Average Remaining Contractual Term, Grants Vested |  |  | 6 years 1 month 6 days |  |
First Advantage Corporations [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Number of units, issued |  |  | 0 |  |
Employee Stock Option |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Unrecognized pre-tax noncash compensation | $ 12.2 |  | $ 12.2 |  |
Restricted Stock Agreements [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Unrecognized pre-tax noncash compensation | 3.0 |  | 3.0 |  |
Restricted Stock Units [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Unrecognized pre-tax noncash compensation | $ 12.9 |  | $ 12.9 |  |

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