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Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 20, 2021 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
ESPP employee payroll contributions |  | $ 100 |  | $ 100 |  | $ 200
ESPP compensation expense |  | 23 | $ 30 | 68 | $ 63 |
Stock Options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share based compensation expenses |  | 200 | (100) | 500 | (100) |
Stock-based compensation not yet recognized related to unvested options |  | 1,100 |  | $ 1,100 |  | $ 1,700
Unvested award, cost not yet recognized, period for recognition |  |  |  | 2 years |  | 2 years 9 months 18 days
Restricted stock units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share based compensation expenses |  | 900 | 300 | $ 2,500 | 1,400 |
Unvested award, cost not yet recognized, period for recognition |  |  |  | 2 years 6 months |  | 2 years 10 months 24 days
Unrecognized compensation expense |  | 5,900 |  | $ 5,900 |  | $ 8,100
Performance stock units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share based compensation expenses |  | 100 | $ 300 | $ 100 | $ 400 |
Unvested award, cost not yet recognized, period for recognition |  |  |  | 2 years 6 months |  | 3 years 4 months 24 days
Unrecognized compensation expense |  | $ 200 |  | $ 200 |  | $ 700
Employee Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Maximum eligible employee compensation contribution percentage | 10.00% |  |  |  |  |
Offering period | 6 months |  |  |  |  |
Fair market value share purchase percentage | 85.00% |  |  |  |  |
Class A Common Stock | Employee Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares authorized for issuance (in shares) |  | 1,483,919 |  | 1,483,919 |  |
Percentage of outstanding stock maximum |  |  |  | 1.00% |  |
Outstanding stock maximum (in shares) |  |  |  | 2,400,000 |  |
Shares purchased under the ESPP (in shares) |  |  |  | 234,249 |  | 44,627
Class A Common Stock | Equity Incentive Plan 2021 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares authorized for issuance (in shares) |  | 17,257,521 |  | 17,257,521 |  |

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