Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Accounts receivable	$ 149	$ 112
Inventory	100	4
Accrued expenses	309	353
NOL carryforwards	28,722	22,569
Interest limitation imposed by the TJCA	9,022	7,235
Stock Compensation	5,003	4,051
Other	2,122	1,229
Sale of Future Revenue	16,595	14,444
Property and equipment	2,566	2,380
Orphan Drug and R&D Tax Credits	5,490	5,851
Accrued debt fees	726	0
Intangible assets	2,547	0
Deferred tax assets	73,351	58,228
Deferred tax liabilities:
Intangible assets	0	(551)
481(a) adjustment	(14)	0
Prepaid expenses	(807)	(908)
Deferred tax liabilities	(821)	(1,459)
Valuation Allowance	(72,530)	(56,769)
Net deferred tax asset/(liability)	$ 0	$ 0