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Stock-Based Compensation - Narrative (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) period shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Apr. 23, 2020 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Capitalized stock-based compensation expense | $ 27.7 | $ 20.3 | $ 9.1 |
Share-based compensation expense not yet recognized | $ 629.4 |  |  |
Expected recognized period (in years) | 2 years 1 month 6 days |  |  |
2000 Equity Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period (in years) | 4 years |  |  |
2001 Supplemental Stock Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period (in years) | 4 years |  |  |
Minimum percentage of fair value of grant | 85.00% |  |  |
2004 Purchase Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of purchase price reductions | 15.00% |  |  |
Number of offering periods | period | 2 |  |  |
Offering period (in months) | 24 months |  |  |
Offering interval (in months) | 6 months |  |  |
Purchase discount from market price (percent) | 85.00% |  |  |
Number of shares available for grant (in shares) | shares | 2,640,649 |  |  |
2020 Equity Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period (in years) | 4 years |  |  |
Number of shares available for grant (in shares) | shares | 3,969,920 |  |  | 4,000,000
Nonstatutory stock options, RSAs, RSUs and stock appreciation rights | 2000 Equity Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of fair market value of common stock on the grant date | 85.00% |  |  |
Incentive stock options | 2000 Equity Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of fair market value of common stock on the grant date | 100.00% |  |  |
RSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted stock units vested and released, net | $ 472.9 | $ 417.0 | $ 269.1 |

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