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Liability Related to Sale of Future Royalties (Tables) | 3 Months Ended
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Mar. 31, 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 months ended March 31, 2021 and 2020.
| 2012 Purchase and Sale Agreement |  | 2020 Purchase and Sale Agreement
| Three months ended March 31, |  | Three months ended March 31,
| 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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