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Stock-Based Compensation - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total common stock reserved for future issuance (in shares) | 7,458,766 |  | 7,458,766 |  | 6,549,080 |
Share-based compensation expense | $ 540 | $ 4,543 | $ 8,910 | $ 15,829 |  |
Internally developed software |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation expense | $ 800 | 800 | $ 2,000 | 1,400 |  |
Vested restricted stock units not yet settled |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total common stock reserved for future issuance (in shares) | 67,479 |  | 67,479 |  | 11,761 |
Restricted stock units (RSUs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Fair value of options vested | $ 200 | $ 100 | $ 1,800 | $ 3,200 |  |
Performance Stock Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Service period (in years) |  |  |  |  | 3 years 9 months 18 days | 1 year 10 months 17 days
Unrecognized compensation expense | 9,400 |  | $ 9,400 |  |  |
Unrecognized compensation expense, period for recognition, years |  |  | 1 year 11 months 12 days |  |  |
Employee stock option |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation expense | $ 700 |  | $ 700 |  |  |
Unrecognized compensation expense, period for recognition, years |  |  | 6 months 14 days |  |  |
2021 Equity and incentive compensation plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares authorized for issuance (in shares) | 7,835,715 |  | 7,835,715 |  |  |
2018 Equity incentive plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares authorized for issuance (in shares) | 6,287,687 |  | 6,287,687 |  |  |

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