CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues from strategic alliances and research contracts	$ 748	$ 2,540	$ 1,955	$ 5,704
Operating expenses:
Research and development	1,377	3,581	3,731	7,904
General and administrative	2,502	2,632	4,409	4,676
Total operating expenses	3,879	6,213	8,140	12,580
Operating loss	(3,131)	(3,673)	(6,185)	(6,876)
Other income:
Interest and Other Income, net	5	10	14	19
Net loss	(3,126)	(3,663)	(6,171)	(6,857)
Basic and diluted net loss per share	$ (0.24)	$ (0.28)	$ (0.48)	$ (0.53)
Shares used in computation of basic and diluted net loss per share	12,948	12,938	12,948	12,938
Comprehensive Loss:
Net loss	(3,126)	(3,663)	(6,171)	(6,857)
Unrealized holding gain/(loss) on securities available for sale	7	(24)	19	(19)
Comprehensive loss	$ (3,119)	$ (3,687)	$ (6,152)	$ (6,876)