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Stock-Based Compensation - Additional Information (Details) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 19, 2020 USD ($) employee | Feb. 29, 2020 USD ($) shares | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Expected dividend yield |  |  |  | 0.00% |  |
Unamortized compensation costs |  |  |  | $ 3,900,000 |  |
Expected recognition period (in years) |  |  |  | 1 year 1 month 6 days |  |
Stock-based compensation expense |  |  |  | $ 41,515,000 | $ 26,241,000 | $ 16,329,000
Number of shares granted (in shares) | shares |  |  |  | 0 |  |
Consulting and Professional Services Agreement (“CPSA”) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense |  |  |  | $ 1,800,000 | $ 0 | $ 0
RSUs issued and unvested |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Expected dividend yield |  |  |  | 0.00% |  |
Expected recognition period (in years) |  |  |  | 2 years 2 months 12 days |  |
Unrecognized RSU expense |  |  |  | $ 61,400,000 |  |
Number of shares eligible to vest (in shares) | shares |  |  |  | 1,114,159 | 886,030 | 547,891
Number of shares granted (in shares) | shares |  |  |  | 595,915 | 629,901 |
ESPP |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unamortized compensation costs |  |  |  | $ 1,900,000 |  |
Expected recognition period (in years) |  |  |  | 10 months 24 days |  |
Performance shares | 2019 Awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Reversal of share-based compensation expense |  |  | $ 4,800,000 |  |  |
Number of employees impacted by modification | employee | 10 |  |  |  |  |
Incremental compensation cost resulting from modification | $ 13,600,000 |  |  |  |  |
Stock-based compensation expense | $ 10,200,000 |  |  |  |  |
Performance shares | 2020 Awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense |  |  |  | $ 1,400,000 |  |
Number of shares granted (in shares) | shares |  | 133,834 |  |  |  |
Fair value at grant date |  | $ 11,000,000.0 |  |  |  |
Performance shares | Minimum | 2020 Awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Performance threshold (as a percent) |  | 19.70% |  |  |  |
Performance target to be earned at performance threshold (as a percent) |  | 50.00% |  |  |  |
Performance shares | Maximum | 2020 Awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Performance threshold (as a percent) |  | 29.00% |  |  |  |
Performance target to be earned at performance threshold (as a percent) |  | 200.00% |  |  |  |

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