Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Statement [Abstract]
Development revenue	$ 1,193	$ 300
Product revenue	9	1,219
Contract revenue	17	282
Total revenue	1,219	1,801
Cost of product revenue	(10)	664
Cost of contract revenue	9	137
Total cost of revenue	(1)	801
Gross margin	1,220	1,000
Research and development expense	2,543	2,252
Sales, marketing, general and administrative expense	1,959	2,403
Gain on disposal of fixed assets	0	(2)
Gain on sale of previously reserved inventory	(227)	(5)
Total operating expenses	4,275	4,648
Loss from operations	(3,055)	(3,648)
Loss on warrant exchange	(4,967)	0
Other income (expense)	4	(6)
Net loss	$ (8,018)	$ (3,654)
Net loss per share - basic and diluted	$ (0.23)	$ (0.14)
Weighted-average shares outstanding - basic and diluted	34,842	25,240