Liability Related to Sale of Future Royalties (Tables)

3 Months Ended

Mar. 31, 2021

Liability Related To Sale Of Future Royalties [Abstract]

Schedule of Activity Within Liability Related to Sale of Future Royalties

The following table shows the activity within the liability related to sale of future royalties for the three months ended March 31, 2021:

	Liability Related to Sale of Future Royalties
	(in thousands)
Balance at December 31, 2020	$	316,305
Non-cash interest expense recognized, net of transaction cost amortization		10,909
Balance at March 31, 2021		327,214
Less: Unamortized transaction cost		(835	)
Carrying value at March 31, 2021	$	326,379