Liability Related to Sale of Future Royalties (Tables)

3 Months Ended

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	%