CONDENSED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues:
Collaboration revenue	$ 35,000		$ 35,000
License fees and royalties	363	$ 160	1,151	$ 975
Total revenues	35,363	160	36,151	975
Operating expenses:
Research and development	4,050	5,994	13,849	16,356
Restructuring charges	(41)		1,306
General and administrative	4,334	4,073	12,911	11,920
Total operating expenses	8,343	10,067	28,066	28,276
Income (loss) from Operations	27,020	(9,907)	8,085	(27,301)
Unrealized gain on derivatives		289	16	366
Interest and other income	187	91	481	273
Interest and other expense	(22)	(22)	(68)	(61)
Net income (loss)	$ 27,185	$ (9,549)	$ 8,514	$ (26,723)
Net income (loss) per share:
Basic (in dollars per share)	$ 0.17	$ (0.06)	$ 0.05	$ (0.18)
Diluted (in dollars per share)	$ 0.17	$ (0.06)	$ 0.05	$ (0.18)
Shares used in computing net income (loss) per share:
Basic (in shares)	158,151,747	156,843,989	157,922,075	152,338,668
Diluted (in shares)	162,669,681	156,843,989	162,448,893	152,338,668