CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenues:
Royalties	$ 372	$ 410
Collaboration	185	0
License fees	2,100	0
Total revenues	2,657	410
Expenses:
Research and development	1,505	1,759
General and administrative	1,877	2,566
Total operating expenses	3,382	4,325
Operating loss	(725)	(3,915)
(Loss) gain on debt extinguishment (Note 7)	(2,600)	296
Interest expense, net (Note 7)	(449)	(223)
Loss before provision for income taxes	(3,774)	(3,842)
Provision for income taxes	0	0
Net loss	$ (3,774)	$ (3,842)
Net loss per share (Note 13):
Basic	$ (0.14)	$ (0.18)
Diluted	$ (0.14)	$ (0.18)
Weighted average number of shares outstanding:
Basic	26,720	21,146
Diluted	26,720	21,146