CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
REVENUES:
Total Revenues	$ 2,763	$ 3,829	$ 6,834	$ 5,363
OPERATING EXPENSES:
Research and Development	21,448	24,999	43,323	50,792
General and Administrative	5,621	6,534	11,215	13,763
Goodwill Impairment			90,976
Intangible Asset Impairment			18,677
(Gain)/Loss on Fair Value Remeasurement of Contingent Consideration	(7,433)	1,000	(21,033)	4,400
Amortization of Acquired Intangible Assets	0	224	224	448
Total Operating Expenses	19,636	32,757	143,382	69,403
Operating Loss	(16,873)	(28,928)	(136,548)	(64,040)
Investment and Other Income, Net	466	362	1,245	1,213
Net Loss Before Income Tax Benefit	(16,407)	(28,566)	(135,303)	(62,827)
Income Tax Benefit			765
Net Loss	$ (16,407)	$ (28,566)	$ (134,538)	$ (62,827)
Basic and Diluted Net Loss Per Common Share (in dollars per share)	$ (0.11)	$ (0.23)	$ (0.93)	$ (0.51)
Shares Used in Calculating Basic and Diluted Net Loss Per Share (in shares)	147,428	125,202	144,007	123,932
COMPREHENSIVE LOSS:
Net Loss	$ (16,407)	$ (28,566)	$ (134,538)	$ (62,827)
Other Comprehensive Income (Loss):
Unrealized Gain (Loss) on Marketable Securities	31	15	26	36
Comprehensive Loss	(16,376)	(28,551)	(134,512)	(62,791)
Product Development and Licensing Agreements
REVENUES:
Total Revenues	1,667	694	2,662	1,250
Contracts and Grants
REVENUES:
Total Revenues	$ 1,096	$ 3,135	$ 4,172	$ 4,113