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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2021 | Feb. 29, 2024 | Dec. 31, 2023 | Feb. 28, 2023
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |
Common stock reserved for future issuance (in shares) | 20,967,834 |  | 20,967,834 |  |  |  | 22,927,115 |
Stock-based compensation expense | $ 8,438 | $ 7,958 | $ 19,495 | $ 18,670 |  |  |  |
Stock-based compensation included in capitalized internal-use software |  |  | 3,162 | 3,703 |  |  |  |
Intrinsic value of options exercised |  |  | 12,500 | 6,100 |  |  |  |
Cost not yet recognized for stock options, amount | 4,500 |  | 4,500 |  |  |  |  |
Incremental modification expense | 1,000 |  |  |  |  |  |  |
ESPP withholding | 1,366 |  | 1,366 |  |  |  | $ 426 |
Sales and marketing |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |
Stock-based compensation expense | 2,908 | 2,747 | 6,492 | 6,616 |  |  |  |
Incremental modification expense | 700 |  |  |  |  |  |  |
General and administrative |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |
Stock-based compensation expense | 1,955 | 1,693 | $ 4,330 | $ 3,812 |  |  |  |
Incremental modification expense | 300 |  |  |  |  |  |  |
Restricted stock units outstanding |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 3,205,244 | 4,214,704 |  |  |  |
Granted (in dollars per share) |  |  | $ 7.02 | $ 5.04 |  |  |  |
Fair value |  |  | $ 22,200 | $ 9,300 |  |  |  |
Cost not yet recognized for restricted stock units, amount | $ 29,900 |  | $ 29,900 |  |  |  |  |
Cost not yet recognized, period for recognition (in years) |  |  | 1 year 9 months 18 days |  |  |  |  |
Options outstanding |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |
Cost not yet recognized, period for recognition (in years) |  |  | 9 months 18 days |  |  |  |  |
2021 Equity Incentive Plan |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |
Minimum annual additional number of shares authorized (in shares) |  |  |  |  | 4,784,100 |  |  |
Minimum annual additional number of shares authorized, common stock outstanding (in percent) |  |  |  |  | 5.00% |  |  |
2021 Equity Incentive Plan | Restricted stock units outstanding | Share-Based Payment Arrangement, Nonemployee |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |
Award vesting period (in years) |  |  | 1 year |  |  |  |  |
2021 Equity Incentive Plan | Maximum | Restricted stock units outstanding | Share-Based Payment Arrangement, Employee |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |
Award vesting period (in years) |  |  | 4 years |  |  |  |  |
2021 Plan |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |
Common stock reserved for future issuance (in shares) | 6,871,300 |  | 6,871,300 |  |  |  | 7,400,180 |
2021 Plan | Restricted stock units outstanding |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |
Common stock reserved for future issuance (in shares) | 5,438,352 |  | 5,438,352 |  |  |  | 5,256,833 |
2021 Plan | Options outstanding |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |
Common stock reserved for future issuance (in shares) | 1,171,252 |  | 1,171,252 |  |  |  | 1,318,485 |
2021 Plan | Employee Stock |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |
Cost not yet recognized, period for recognition (in years) |  |  | 7 months 6 days |  |  |  |  |
Stock-based compensation expense | $ 400 | 900 | $ 1,200 | 2,800 |  |  |  |
Stock-based compensation included in capitalized internal-use software | 100 | 200 | 400 | 700 |  |  |  |
Cost not yet recognized for stock options, amount | $ 700 |  | 700 |  |  |  |  |
Incremental modification expense |  |  | $ 300 |  |  |  |  |
2021 Employee Stock Purchase Plan |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |
Minimum annual additional number of shares authorized (in shares) |  |  |  |  | 1,913,630 |  |  |
Minimum annual additional number of shares authorized, common stock outstanding (in percent) |  |  |  |  | 2.00% |  |  |
Common stock reserved for future issuance (in shares) | 1,359,455 |  | 1,359,455 |  |  |  | 962,960 |
2022 Employee Bonus Plan | Restricted stock units outstanding |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized (in shares) |  |  |  |  |  | 296,000 |  | 288,000
Stock-based compensation expense | $ 500 | 1,700 | $ 1,800 | 2,600 |  |  |  |
Stock-based compensation included in capitalized internal-use software | 100 | $ 200 | 200 | $ 400 |  |  |  |
2024 Employee Bonus Plan | Restricted stock units outstanding |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |
Accrued bonus balance | $ 1,300 |  | $ 1,300 |  |  |  |  |

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