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CONDENSED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenues:
License fees and royalties	$ 251	$ 341	$ 788	$ 815
Operating expenses:
Research and development	4,812	5,151	9,799	10,362
Restructuring charges	941		1,347
General and administrative	3,977	3,853	8,577	7,847
Total operating expenses	9,730	9,004	19,723	18,209
Loss from Operations	(9,479)	(8,663)	(18,935)	(17,394)
Unrealized gain (loss) on derivatives		(147)	16	77
Interest and other income	145	99	294	182
Interest and other expense	(22)	(23)	(46)	(39)
Net loss	$ (9,356)	$ (8,734)	$ (18,671)	$ (17,174)
Basic and diluted net loss per share (in dollars per share)	$ (0.06)	$ (0.06)	$ (0.12)	$ (0.11)
Shares used in computing basic and diluted net loss per share (in shares)	158,066,910	156,706,196	157,807,239	150,086,007

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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.

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