Note O - Net Loss Per Share - Anti-dilutive Securities (Details) - shares		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Antidilutive securities (in shares)		38,630,026	12,993,641
Convertible Debt Securities [Member]
Antidilutive securities (in shares)		1,213,606	1,167,607
2021 Notes [Member]
Antidilutive securities (in shares)		175,336	4,481,182
The 2019 Notes [Member]
Antidilutive securities (in shares)	[1]	29,625,785
Share-based Payment Arrangement [Member]
Antidilutive securities (in shares)		5,192,222	3,704,755
Warrants to Purchase Common Stock [Member]
Antidilutive securities (in shares)		2,423,077	2,527,763
Series A Convertible Preferred Stock [Member]
Antidilutive securities (in shares)			1,112,334

[1] Inclusive of 26,439,015 of shares of Common Stock issuable (i) in exchange of the Deerfield Optional Conversion Feature, or (ii) upon conversion of the Series B-2 Preferred Stock issuable in exchange of the Deerfield Optional Conversion Feature.