CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
REVENUES:
Total Revenues	$ 236	$ 715	$ 2,965	$ 2,140
OPERATING EXPENSES:
Research and Development	9,705	10,081	21,400	21,232
General and Administrative	3,528	3,908	7,194	8,804
Intangible Asset Impairment	3,500		3,500
Other Asset Impairment				1,800
(Gain) Loss on Fair Value Remeasurement of Contingent Consideration	(5,132)	(1,017)	(4,898)	502
Total Operating Expenses	11,601	12,972	27,196	32,338
Operating Loss	(11,365)	(12,257)	(24,231)	(30,198)
Investment and Other Income, Net	106	478	347	1,180
Net Loss Before Income Tax Benefit	(11,259)	(11,779)	(23,884)	(29,018)
Income Tax Benefit	228		228
Net Loss	$ (11,031)	$ (11,779)	$ (23,656)	$ (29,018)
Basic and Diluted Net Loss Per Common Share	$ (0.50)	$ (0.84)	$ (1.20)	$ (2.21)
Shares Used in Calculating Basic and Diluted Net Loss Per Share	22,082	13,952	19,744	13,129
COMPREHENSIVE LOSS:
Net Loss	$ (11,031)	$ (11,779)	$ (23,656)	$ (29,018)
Other Comprehensive Income (Loss):
Unrealized (Loss) Gain on Marketable Securities	(3)	36	(25)	55
Comprehensive Loss	(11,034)	(11,743)	(23,681)	(28,963)
Product Development and Licensing Agreements
REVENUES:
Total Revenues		195	2,285	325
Contracts and Grants
REVENUES:
Total Revenues	$ 236	$ 520	$ 680	$ 1,815