Royalty Linked Notes - Summary of Royalty-Linked Notes (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 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	798
Total liability related to the sale of future royalties at June 30, 2021	15,505
Current portion of royalty-linked notes	190	$ 114
Long-term Portion	$ 15,315