Sale of Future Revenue - Royalty Obligation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Sale of Future Revenue [Roll Forward]
Liability related to the sale of future revenue, net at December 31, 2021	$ 60,284
Royalties related to the sale of future revenue	12,270	$ 11,122
Amortization of issuance costs	50
Interest expense related to the sale of future revenue	1,836	$ 3,302
Liability related to the sale of future revenue, net (includes current portion of $1,732)	62,078
Current portion	1,732
Royalty
Sale of Future Revenue [Roll Forward]
Royalties related to the sale of future revenue	$ (92)