CONDENSED STATEMENTS OF OPERATIONS - USD ($)	3 Months Ended	9 Months Ended
Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues:
Collaboration revenue		$ 35,000,000		$ 35,000,000
License fees and royalties	$ 5,108,000	363,000	$ 6,068,000	1,151,000
Total revenues	5,108,000	35,363,000	6,068,000	36,151,000
Operating expenses:
Research and development	4,319,000	4,050,000	13,927,000	13,849,000
Restructuring charges		(41,000)		1,306,000
General and administrative	4,666,000	4,334,000	14,006,000	12,911,000
Total operating expenses	8,985,000	8,343,000	27,933,000	28,066,000
(Loss) income from operations	(3,877,000)	27,020,000	(21,865,000)	8,085,000
Unrealized gain on derivatives				16,000
Interest and other income	322,000	187,000	871,000	481,000
Interest and other expense	(21,000)	(22,000)	(61,000)	(68,000)
Net (loss) income	$ (3,576,000)	$ 27,185,000	$ (21,055,000)	$ 8,514,000
Net (loss) income per share:
Basic (in dollars per share)	$ (0.02)	$ 0.17	$ (0.13)	$ 0.05
Diluted (in dollars per share)	$ (0.02)	$ 0.17	$ (0.13)	$ 0.05
Shares used in computing net (loss) income per share:
Basic (in shares)	159,140,254	158,151,747	159,011,741	157,922,075
Diluted (in shares)	159,140,254	162,669,681	159,011,741	162,448,893

Revenue earned during the period relating to consideration received from another party for the right to use, but not own, certain of the entity's intangible assets. Licensing arrangements include, but are not limited to, rights to use a patent, copyright, technology, manufacturing process, software or trademark. Licensing fees are generally, but not always, fixed as to amount and not dependent upon the revenue generated by the licensing party. An entity may receive licensing fees for licenses that also generate royalty payments to the entity. Royalty revenue is derived from a percentage or stated amount of sales proceeds or revenue generated by the third party using the entity's property. Examples of property from which royalties may be derived include patents and oil and mineral rights.

No definition available.