Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Development revenue	$ 230	$ 660	$ 1,691	$ 1,840
Product revenue	16	176	44	2,312
Contract revenue	722	128	1,063	483
Total revenue	968	964	2,798	4,635
Cost of product revenue	5	8	28	1,509
Cost of contract revenue	363	76	507	239
Total cost of revenue	368	84	535	1,748
Gross margin	600	880	2,263	2,887
Research and development expense	2,369	2,893	7,148	7,484
Sales, marketing, general and administrative expense	1,588	2,132	5,416	6,636
Gain on disposal of fixed assets	(1)	(33)	(29)	(35)
Gain on sale of previously reserved inventory		(26)	(455)	(32)
Total operating expenses	3,956	4,966	12,080	14,053
Loss from operations	(3,356)	(4,086)	(9,817)	(11,166)
Change in warrant liability	0	397	0	397
Loss on warrant exchange	0	18	(4,967)	18
Other income (expense)	1	4	10	(6)
Net loss	$ (3,355)	$ (3,667)	$ (14,774)	$ (10,757)
Net loss per share - basic and diluted	$ (0.08)	$ (0.13)	$ (0.36)	$ (0.40)
Weighted-average shares outstanding - basic and diluted	43,858	28,448	40,605	26,739

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