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CONDENSED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues:
License fees and royalties	$ 160	$ 181	$ 975	$ 1,058
Operating expenses:
Research and development	5,994	5,338	16,356	18,066
Restructuring charges		116		1,032
General and administrative	4,073	3,460	11,920	11,643
Total operating expenses	10,067	8,914	28,276	30,741
Loss from operations	(9,907)	(8,733)	(27,301)	(29,683)
Unrealized gain (loss) on derivatives	289	(208)	366	(207)
Interest and other income	91	699	273	836
Interest and other expense	(22)	(12)	(61)	(44)
Net loss	$ (9,549)	$ (8,254)	$ (26,723)	$ (29,098)
Basic and diluted net loss per share (in dollars per share)	$ (0.06)	$ (0.06)	$ (0.18)	$ (0.23)
Shares used in computing basic and diluted net loss per share (in shares)	156,843,989	128,293,074	152,338,668	128,146,333

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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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