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CONDENSED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues:
License fees and royalties	$ 341	$ 112	$ 815	$ 877
Operating expenses:
Research and development	5,151	4,807	10,362	12,728
Restructuring charges		838		916
General and administrative	3,853	3,432	7,847	8,183
Total operating expenses	9,004	9,077	18,209	21,827
Loss from operations	(8,663)	(8,965)	(17,394)	(20,950)
Unrealized (loss) gain on derivatives	(147)	(24)	77	1
Interest and other income	99	56	182	137
Interest and other expense	(23)	(14)	(39)	(32)
Net loss	$ (8,734)	$ (8,947)	$ (17,174)	$ (20,844)
Basic and diluted net loss per share (in dollars per share)	$ (0.06)	$ (0.07)	$ (0.11)	$ (0.16)
Shares used in computing basic and diluted net loss per share (in shares)	156,706,196	128,162,993	150,086,007	128,072,962

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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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