Note C - Debt Obligations - Convertible Notes Outstanding (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Convertible notes	$ 67,088	$ 80,199
Less: debt issuance costs and discounts	(1,168)	(2,856)
Convertible notes, net	65,920	77,343
Deerfield Convertible Notes [Member]
Convertible notes	7,340	6,981
2021 Notes [Member]
Convertible notes		3,000
The 2019 Notes [Member]
Convertible notes	56,615	70,218
January 2020 Note [Member]
Convertible notes	$ 3,133

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant