CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Revenues from strategic alliances and research contracts	$ 193	$ 252	$ 725	$ 2,512
Operating expenses:
General and administrative	999	1,334	3,619	5,056
Research and development	705	523	2,028	1,701
Total operating expenses	1,704	1,857	5,647	6,757
Operating loss	(1,511)	(1,605)	(4,922)	(4,245)
Other income:
Interest and other income, net	6	9	19	14
Net loss	$ (1,505)	$ (1,596)	$ (4,903)	$ (4,231)
Basic and diluted net loss per share (in dollars per share)	$ (0.09)	$ (0.10)	$ (0.30)	$ (0.27)
Shares used in computation of basic and diluted net loss per share (in shares)	16,760	16,540	16,614	15,587
Comprehensive Loss:
Net loss	$ (1,505)	$ (1,596)	$ (4,903)	$ (4,231)
Unrealized holding gain/(loss) on securities available for sale	(7)	3	(5)	(1)
Comprehensive loss	$ (1,512)	$ (1,593)	$ (4,908)	$ (4,232)