Liability Related to the Revenue Interest Purchase Agreement - Summary of Revenue Interest Liability (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2021 |
Mar. 31, 2020 |
|
| Liability From Sale Of Future Revenues [Roll Forward] | ||
| Revenue interest liability at December 31, 2020 | $ 176,604 | |
| Revenue Interests payments | (573) | $ 0 |
| Revenue interest liability at March 31, 2021 | 180,956 | |
| Revenue Interest Purchase Agreement (RIPA) | ||
| Liability From Sale Of Future Revenues [Roll Forward] | ||
| Interest expense recognized | 4,925 | |
| Revenue interest liability at March 31, 2021 | $ 181,000 | |