Liabilities Related to the Sales of Future Royalties (Tables)

12 Months Ended

Dec. 31, 2023

Liability Related To Sale Of Potential Future Royalties [Abstract]

Schedule of Liability Related to Potential Future Royalties

The following table shows the activity within the liability account of each arrangement (in thousands):

	Year-Ended December 31, 2023									Period from inception to December 31, 2023
	2012 Purchase and Sale Agreement			2020 Purchase and Sale Agreement			Total			2012 Purchase and Sale Agreement			2020 Purchase and Sale Agreement			Total
Liabilities related to the sales of future royalties—beginning balance	$	55,167		$	102,294		$	157,461		$	—		$	—		$	—
Royalty monetization proceeds		—			—			—			124,000			150,000			274,000
Non-cash royalty revenue		(37,323	)		(31,598	)		(68,921	)		(353,847	)		(118,319	)		(472,166	)
Non-cash interest expense		6,373			18,961			25,334			240,542			57,976			298,518
Payments to RPI		—			—			—			(10,000	)		—			(10,000	)
Loss on revaluation of liability related to the sale of future royalties		—			—			—			23,522			—			23,522
Liabilities related to the sales of future royalties – ending balance		24,217			89,657			113,874			24,217			89,657			113,874
Less: unamortized transaction costs		—			(1,249	)		(1,249	)		—			(1,249	)		(1,249	)
Liabilities related to the sales of future royalties, net	$	24,217		$	88,408		$	112,625		$	24,217		$	88,408		$	112,625