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Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2022 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021 | May 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Granted (in shares) |  | 0 | 0 | 700,000 |  |  |
Granted (in usd per share) |  |  |  | $ 50.63 |  |  |
Expected term (in years) |  |  |  | 5 years 3 months 18 days |  | 4 years |
Vested in period, value |  |  |  | $ 0.9 | $ 10.7 |  |
Non-vested restricted stock units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Total unrecognized compensation cost related to unvested restricted stock units |  | $ 68.2 |  | $ 68.2 |  |  |
Weighted average remaining vesting period (in years) |  |  |  | 1 year 8 months 12 days |  |  |
2017 Equity Incentive Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares available to be issued (in shares) |  | 2,851,988 |  | 2,851,988 |  |  |
2017 Equity Incentive Plan | Chief Executive Officer |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Granted (in shares) | 700,000 |  |  |  |  |  |
Granted (in usd per share) | $ 50.63 |  |  |  |  |  |
Compensation cost related to nonvested stock options not yet recognized |  | $ 17.2 |  | $ 17.2 |  |  |
2017 Equity Incentive Plan | Chief Executive Officer | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Expected term (in years) | 3 years 4 months 24 days |  |  |  |  |  |
2017 Equity Incentive Plan | Chief Executive Officer | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Expected term (in years) | 4 years 1 month 6 days |  |  |  |  |  |
2017 Equity Incentive Plan | Chief Executive Officer | Stock options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Value of award at grant date | $ 18.8 |  |  |  |  |  |
Unrecognized compensation cost related to nonvested stock option recognized over weighted average period (in years) |  |  |  | 3 years 4 months 24 days |  |  |
2017 Equity Incentive Plan | Chief Executive Officer | Stock options | Tranche One |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting rights percentage | 25.00% |  |  |  |  |  |
Vesting price threshold (in usd per share) | $ 175 |  |  |  |  |  |
2017 Equity Incentive Plan | Chief Executive Officer | Stock options | Tranche Two |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting rights percentage | 25.00% |  |  |  |  |  |
Vesting price threshold (in usd per share) | $ 200,000,000 |  |  |  |  |  |
2017 Equity Incentive Plan | Chief Executive Officer | Stock options | Tranche Three |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting rights percentage | 25.00% |  |  |  |  |  |
Vesting price threshold (in usd per share) | $ 225,000,000 |  |  |  |  |  |
2017 Equity Incentive Plan | Chief Executive Officer | Stock options | Tranche Four |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting rights percentage | 25.00% |  |  |  |  |  |
Vesting price threshold (in usd per share) | $ 250,000,000 |  |  |  |  |  |
2017 Equity Incentive Plan | Chief Executive Officer | Stock options | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Expected term (in years) |  |  |  | 4 years 1 month 6 days |  |  |
2017 Equity Incentive Plan | Class A Common Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares available to be issued (in shares) |  | 7,195,049 |  | 7,195,049 |  |  | 6,421,442
2007 Stock Option Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares available to be issued (in shares) |  |  |  |  |  |  | 421,442
Number of shares available for grants (in shares) |  |  |  |  |  |  | 0

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