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Liability Related to Sale of Future Royalties (Tables) | 6 Months Ended
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Jun. 30, 2021
Other Liabilities Disclosure [Abstract] |
Schedule Of Liability Related To Sale Of Potential Future Royalties | The following table presents our estimates of the annual interest rates over the lives of the agreements and the resulting prospective interest rates used to recognize non-cash interest expense for the three and six months ended June 30, 2021 and 2020.
| 2012 Purchase and Sale Agreement |  | 2020 Purchase and Sale Agreement
| Three and six months ended June 30, |  | Three and six months ended June 30,
| 2021 |  | 2020 |  | 2021
Interest rates - end of period presented |  |  |  |  |
Implicit interest rate over the life of the agreement | 20.2 | % |  | 19.5 | % |  | 16.0 | %
Prospective effective interest rate | 48.0 | % |  | 38.0 | % |  | 16.0 | %

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