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Stock-based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 31, 2021 | Feb. 28, 2021 | Jan. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |
Capital shares reserved for future issuance |  |  |  |  |  |  |  | 203,235,599 |  |
Stock-based compensation expense |  |  |  | $ 34,725 | $ 10,868 | $ 91,828 | $ 19,362 | $ 62,387 | $ 10,222 | $ 5,465
Number of shares stock option |  |  |  |  |  |  |  | 13,158,430 | 12,199,200 |
Employee promissory note settled in shares |  | $ 17,200 |  |  |  |  |  |  |  |
Employee promissory note settled in cash |  | 3,700 |  |  |  |  |  |  |  |
Liabilities related to exercised options subject to repurchase |  |  |  |  |  | $ 2,400 |  | $ 100 | $ 100 |
Tranche One |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |
Exercised options, right to repurchase, term |  |  |  |  |  | 1 year |  | 1 year |  |
Tranche Two |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |
Exercised options, right to repurchase, term |  |  |  |  |  | 36 months |  | 36 months |  |
Promissory Notes |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |
Employee promissory note outstanding |  |  |  | $ 15,100 |  | $ 15,100 |  | $ 40,400 | $ 20,000 |
Employee promissory note settled |  | $ 20,900 |  |  |  |  |  |  |  |
Stock Options |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares stock option |  |  |  |  |  |  |  | 13,158,430 | 12,199,200 | 8,764,428
Intrinsic value of options outstanding |  |  |  |  |  |  |  | $ 1,800,000 | $ 23,400 |
Unrecognized compensation costs |  |  |  |  |  |  |  | $ 132,200 | $ 26,800 |
Weighted average vesting period |  |  |  |  |  |  |  | 2 years 10 months 24 days |  |
Weighted average grant date stock fair value |  |  |  |  |  |  |  | $ 15.94 | $ 1.97 | $ 1.49
Restricted stock units |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares stock option |  |  |  | 870,410 |  | 6,908,924 |  |  |  |
Restricted stock units granted |  |  |  | $ 58.92 |  | $ 58.60 |  |  |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |
Unrecognized compensation costs |  |  |  |  |  |  |  | $ 1,800 | $ 6,700 |
Weighted average vesting period |  |  |  |  |  |  |  | 1 year 1 month 6 days |  |
Restricted stock units granted |  |  |  |  |  |  |  | $ 0 | $ 1.97 |
Maximum | Restricted stock units |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | 5 years |  |  |  |
Minimum | Restricted stock units |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | 4 years |  |  |  |
Class A Common Stock |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |
Capital shares reserved for future issuance |  |  |  |  |  |  |  | 202,599,749 |  |
Number of shares recognized cost |  | 60,968 |  |  |  |  |  |  |  |
Number of share options exercised (in shares) |  |  |  | 2,884,999 |  | 2,884,999 |  | 8,022,499 | 5,760,000 |
Class A Common Stock | Equity Option |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |
Exercised options subject to repurchase |  |  |  |  |  | 879,600 |  | 19,800 | 11,337 |
Class A Common Stock | Promissory Notes |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |
Early exercised options with promissory note (in shares) |  |  |  |  |  | 841,563 |  | 4,136,677 | 4,601,877 |
2011 equity incentive plan |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  | 4 years |  |
Stock-based compensation expense |  |  |  | $ 300 |  | $ 900 |  | $ 900 |  |
Share based compensation by share based payment arrangement number of shares available for issuance |  |  |  |  |  |  |  | 3,486,785 |  |
Stock option contractual term |  |  |  |  |  |  |  | 10 years |  |
2011 equity incentive plan | Class A Common Stock |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |
Capital shares reserved for future issuance |  |  |  |  |  |  |  | 125,316,000 |  |
2011 equity incentive plan | Common Stock |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares stock option |  |  | 206,000 |  |  |  |  |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  |  |  |  |  | 24 months |  |  |  |
Employee Stock Purchase Plan | Class A Common Stock |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement increase in the number of shares available for future issuance as a percentage of outstanding stock |  |  |  |  |  | 1.00% |  |  |  |
Percentage of eligible compensation eligible for participation in the stock purchase plan |  |  |  | 15.00% |  | 15.00% |  |  |  |
Share based compensation by share based payment arrangement purchase price of the stock as a percentage of fair value |  |  |  |  |  | 85.00% |  |  |  |
Share based compensation by share based payment arrangement maximum number of shares per employee |  |  |  |  |  | 590 |  |  |  |
Share based compensation by share based payment arrangement number of shares available for issuance |  |  |  | 7,800,000 |  | 7,800,000 |  |  |  |
Share based compensation by share based payment arrangement number of additional shares available for issuance |  |  |  |  |  | 7,800,000 |  |  |  |
2021 Partner Studio Incentive Plan |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |
Capital shares reserved for future issuance |  |  |  | 390,000 |  | 390,000 |  |  |  |
2021 Partner Studio Incentive Plan | Restricted stock units |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares stock option | 359,623 |  |  |  |  |  |  |  |  |
Restricted stock units granted | $ 57.19 |  |  |  |  |  |  |  |  |
2021 Partner Studio Incentive Plan | Maximum | Restricted stock units |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period | 5 years |  |  |  |  |  |  |  |  |
2021 Partner Studio Incentive Plan | Minimum | Restricted stock units |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period | 4 years |  |  |  |  |  |  |  |  |
2021 equity incentive plan |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |
Capital shares reserved for future issuance |  |  |  | 39,000,000 |  | 39,000,000 |  |  |  |
Share based compensation by share based payment arrangement increase in the number of shares available for future issuance |  |  |  |  |  | 39,000,000 |  |  |  |
Share based compensation by share based payment arrangement increase in the number of shares available for future issuance as a percentage of outstanding stock |  |  |  |  |  | (5.00%) |  |  |  |

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