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Stock-Based Compensation - Narrative (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jan. 31, 2023 shares | Jan. 31, 2022 shares | Aug. 31, 2021 shares | Jun. 30, 2021 performanceCondition shares | Sep. 30, 2023 USD ($) shares | Sep. 30, 2022 USD ($) shares | Sep. 30, 2023 USD ($) shares | Sep. 30, 2022 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total stock-based compensation expense | $ |  |  |  |  | $ 16,291,000 | $ 24,301,000 | $ 54,083,000 | $ 78,209,000
Direct Listing |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total stock-based compensation expense | $ |  |  |  |  |  | 3,800,000 |  | 14,600,000
Series A common stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares available for future issuance |  |  |  |  | 153,257,260 |  | 153,257,260 |
Series B common stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares available for future issuance |  |  |  |  | 27,454,426 |  | 27,454,426 |
2021 Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Annual increase in shares authorized, percent |  |  | 5.00% |  |  |  |  |
Number of additional shares authorized | 5,766,938 | 5,735,463 |  |  |  |  |  |
2021 Plan | Series A common stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized |  |  | 11,076,515 |  |  |  |  |
The Plans | Series A common stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Options approved for grant (in shares) |  |  |  |  | 20,705,913 |  | 20,705,913 |
The Founders Grant |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total stock-based compensation expense | $ |  |  |  |  | $ 10,400,000 | $ 18,700,000 | $ 35,400,000 | $ 58,100,000
Stock options or restricted stock units (RSUs) | 2021 Incentive Award Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting period |  |  | 4 years |  |  |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized |  |  | 2,215,303 |  |  |  |  |
Number of additional shares authorized | 1,153,387 | 1,147,092 | 16,614,772 |  |  |  |  |
Shares available for future issuance |  |  |  |  | 4,210,184 |  | 4,210,184 |
Shares purchased under ESPP (in shares) |  |  |  |  | 0 | 0 | 116,936 | 118,329
Total stock-based compensation expense | $ |  |  |  |  | $ 608,000 | $ 638,000 | $ 2,020,000 | $ 2,095,000
Contributions withheld from employees | $ |  |  |  |  | 459,000 | $ 539,000 | 1,455,000 | $ 2,126,000
Cost not yet recognized, outstanding awards | $ |  |  |  |  | $ 1,900,000 |  | $ 1,900,000 |
Non-vested award, cost not yet recognized, period for recognition |  |  |  |  |  |  | 8 months 12 days |
Granted (in shares) |  |  |  |  | 475,916 |  | 528,238 |
Stock options | The Plans |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Cost not yet recognized, outstanding awards | $ |  |  |  |  | $ 3,100,000 |  | $ 3,100,000 |
Non-vested award, cost not yet recognized, period for recognition |  |  |  |  |  |  | 7 months 6 days |
Restricted stock units (RSUs) |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Units vested (in shares) |  |  |  |  |  |  | 839,551 |
Granted (in shares) |  |  |  |  |  |  | 1,677,009 |
Restricted stock units (RSUs) | 2021 Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total stock-based compensation expense | $ |  |  |  |  | 4,400,000 |  | $ 14,200,000 |
Restricted stock units (RSUs) | The Plans |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Non-vested award, cost not yet recognized, period for recognition |  |  |  |  |  |  | 1 year 2 months 12 days |
Cost not yet recognized, outstanding awards | $ |  |  |  |  | 48,000,000 |  | $ 48,000,000 |
Restricted stock units (RSUs) | The Founders Grant |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting period |  |  |  | 5 years |  |  |  |
Granted (in shares) |  |  |  | 1,884,724 |  |  |  |
Grant date fair value | $ |  |  |  |  |  |  | 66,900,000 |
Performance stock units (PSUs) |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award expiration period |  |  |  | 10 years |  |  |  |
Number of performance conditions | performanceCondition |  |  |  | 2 |  |  |  |
Terms of award, stock price hurdle period |  |  |  | 10 years |  |  |  |
Performance stock units (PSUs) | Monte Carlo simulation |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Grant date fair value | $ |  |  |  |  |  |  | $ 128,800,000 |
Performance stock units (PSUs) | Series B common stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares receivable per share based payments award (in shares) |  |  |  | 1 |  |  |  |
Performance stock units (PSUs) | The Plans |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Non-vested award, cost not yet recognized, period for recognition |  |  |  |  |  |  | 7 months 6 days |
Cost not yet recognized, outstanding awards | $ |  |  |  |  | $ 22,300,000 |  | $ 22,300,000 |
Performance stock units (PSUs) | The Founders Grant |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 4,397,688 |  |  |  |

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