Sale of Future Revenue (Tables)

6 Months Ended

Jun. 30, 2021

Revenue from Contract with Customer [Abstract]

Royalty Obligation Activity

The following table shows the activity of the liability related to the sale of future for the six months ended June 30, 2021:

Liability related to the sale of future revenue, net at December 31, 2020	$	48,974
Royalties related to the sale of future revenue	(1,034)
Amortization of issuance costs	71
Interest expense related to the sale of future revenue	6,729
Liability related to the sale of future revenue, net (includes current portion of $1,737)	$	54,740