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Equity, Narrative (Details) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2011 USD ($) shares | Dec. 31, 2021 USD ($) plan shares | Dec. 31, 2020 shares | Dec. 31, 2019 | Jun. 28, 2019 shares | Jun. 21, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of primary stock incentive plans | plan |  | 1 |  |  |  |
Shares reserved for future issuances (in shares) |  | 17,700,000 |  |  |  |
Dividend rate |  | 0.00% |  |  |  |
Stock options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Compensation cost not yet recognized | $ |  | $ 43,600,000 |  |  |  |
Compensation cost not yet recognized period of recognition |  | 2 years 8 months 12 days |  |  |  |
Dividend rate |  | 0.00% | 0.00% | 0.00% |  |
ESPP |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Maximum employee contribution rate (percent) | 15.00% |  |  |  |  |
Purchase price of common stock as percentage of lower of fair market value of common stock on first day of offering period or last day of purchase period | 85.00% |  |  |  |  |
Periodic purchase limit (shares) | 4,000 |  |  |  |  |
Annual purchase limit | $ | $ 25,000 |  |  |  |  |
Granted (shares) |  | 0 | 0 |  |  |
2009 Equity Incentive Plan (Amended Plan) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares deregistered (in shares) |  |  |  |  | 46,200,000 |
2009 Equity Incentive Plan (Amended Plan) | Stock options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares authorized (in shares) |  |  |  |  |  | 47,873,531
Shares reserved for future issuances (in shares) |  |  |  |  |  | 13,500,000
2009 Equity Incentive Plan (Amended Plan) | Restricted Stock Units and Options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Remaining shares available for grant under the plans (in shares) |  | 11,800,000 |  |  |  |
2009 Equity Incentive Plan (Amended Plan) | Individual Owning 10 Percent or More of Stock | Stock options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Minimum stock ownership percent triggering early award expiration |  | 10.00% |  |  |  |
Percent of market price for non-statutory options |  | 110.00% |  |  |  |
Award expiration period |  | 5 years |  |  |  |
2009 Equity Incentive Plan (Amended Plan) | Employee | Stock options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percent of market price for non-statutory options |  | 100.00% |  |  |  |
2009 Equity Incentive Plan (Amended Plan) | Directors and Other Service Providers | Stock Options, Nonqualifying |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percent of market price for non-statutory options |  | 100.00% |  |  |  |
2009 Equity Incentive Plan (Amended Plan) | Individual Owning Less Than 10 Percent of Stock | Stock options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Maximum stock ownership percent triggering early award expiration |  | 10.00% |  |  |  |
Option contractual term |  | 10 years |  |  |  |
Award vesting period |  | 4 years |  |  |  |

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