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Stock-Based Compensation - Summary of Recognized Stock-based Compensation Expense Related to Restricted Stock Award Activity (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Total stock-based compensation | $ 16,130 | $ 17,699 | $ 83,061 | $ 46,313
A&R 2019 Plan and 2019 Inducement Plan | Other RSAs |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Total stock-based compensation | 1,486 |  | 4,754 |
A&R 2019 Plan and 2019 Inducement Plan | Restricted Stock Awards |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Total stock-based compensation | $ 1,486 |  | 28,181 |
A&R 2019 Plan and 2019 Inducement Plan | 2020 Stock and Equity Award Exchange Program |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Total stock-based compensation |  |  | $ 23,427 |

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