Royalty Linked Notes - Summary of Royalty-Linked Notes (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Royalty Linked Notes [Abstract]
Total liability related to the sale of future royalties, on inception	$ 10,990
Liability related to the sale of future royalties, arising from the Rights Offering	51
Amortization of discount and debt issuance costs	3,666
Adjustments to fair value	3,696
Total liability related to the sale of future royalties at September 30, 2021	18,403
Current portion of royalty-linked notes		$ 114
Long-term Portion	$ 18,403