Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues:
Contract revenue	$ 4,427	$ 3,004	$ 12,382	$ 9,073
License and royalty revenue	590	438	1,755	1,321
Total revenues	5,017	3,442	14,137	10,394
Operating expenses:
Research and development	2,128	3,180	8,222	7,705
Manufacturing and production	1,306	2,292	6,626	7,457
General and administrative	1,916	2,366	6,271	7,176
Total operating expenses	5,350	7,838	21,119	22,338
Loss from operations	(333)	(4,396)	(6,982)	(11,944)
Other income:
Investment and other income, net	33	32	99	85
Net loss	$ (300)	$ (4,364)	$ (6,883)	$ (11,859)
Basic and diluted net loss per share	$ 0.00	$ (0.05)	$ (0.08)	$ (0.13)
Weighted average shares used in computing basic and diluted net loss per share	91,957	89,976	91,600	88,154