Sale of Future Revenue - Royalty Obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Sale of Future Revenue [Roll Forward]
Liability related to the sale of future revenue, net at December 31, 2020	$ 48,974
Revenues	50,832	$ 45,849
Amortization of issuance costs	159
Interest expense related to the sale of future revenue	12,253	1,938
Liability related to the sale of future revenue, net (includes current portion of $1,225)	60,284	$ 48,974
Current portion of liability related to sale of future revenue	1,225
Royalty
Sale of Future Revenue [Roll Forward]
Revenues	$ (1,102)