Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Accounts receivable	$ 4	$ 177
Inventory	345	449
Accrued expenses	73	1,063
NOL carryforwards	27,120	32,197
Interest limitation imposed by the TJCA	9,880	10,667
Stock Compensation	6,529	5,813
Deferred Revenue	7,662	2,326
Royalty Monetization	16,750	17,139
Property and equipment	2,756	2,576
Orphan Drug and R&D Tax Credits	4,805	5,625
Accrued debt fees	0	697
Intangible Assets	154	1,731
Section 174 R&D Capitalization	5,039	3,770
Royalty Obligations	3,520	0
Other	58	82
Deferred tax assets	84,695	84,312
Deferred tax liabilities:
481(a) adjustment	(193)	0
Prepaid expenses	(449)	(524)
Deferred tax liabilities	(642)	(524)
Valuation Allowance	(84,053)	(83,788)
Net deferred tax asset/(liability)	$ 0	$ 0