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CONDENSED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues:
License fees and royalties	$ 174	$ 211	$ 711	$ 960
Operating expenses:
Research and development	2,499	4,575	5,873	9,608
General and administrative	4,406	4,547	9,063	9,340
Total operating expenses	6,905	9,122	14,936	18,948
Loss from operations	(6,731)	(8,911)	(14,225)	(17,988)
Interest and other income	346	293	678	549
Interest and other expense	(20)	(19)	(41)	(40)
Net loss	$ (6,405)	$ (8,637)	$ (13,588)	$ (17,479)
Basic and diluted net loss per share (in dollars per share)	$ (0.04)	$ (0.05)	$ (0.09)	$ (0.11)
Shares used in computing basic and diluted net loss per share (in shares)	159,182,367	158,998,931	159,171,959	158,947,485

X

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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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