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 presents the changes in the liability related to the sale of future royalties under the Royalty Purchase Agreement with HCR (in thousands):

	Three Months Ended
	March 31, 2021
Liability related to sale of future royalties, beginning balance	$	193,298
Zolgensma royalties paid to HCR		(9,471	)
Non-cash interest expense		6,702
Liability related to sale of future royalties, ending balance		190,529
Current portion of liability related to sale of future royalties		(28,807	)
Liability related to sale of future royalties, non-current	$	161,722