Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Product revenue	$ 750	$ 904	$ 2,279	$ 1,790
Contract revenue	545	251	746	484
Total revenue	1,295	1,155	3,025	2,274
Cost of product revenue	(281)	2,985	3,894	5,225
Cost of contract revenue	248	395	403	694
Total cost of revenue	(33)	3,380	4,297	5,919
Gross margin	1,328	(2,225)	(1,272)	(3,645)
Research and development expense	3,227	3,478	7,167	7,805
Sales, marketing, general and administrative expense	3,064	3,577	6,352	6,876
Gain on disposal of fixed assets	(1)	0	(1)	(7)
Total operating expenses	6,290	7,055	13,518	14,674
Loss from operations	(4,962)	(9,280)	(14,790)	(18,319)
Other income (expense)	(9)	105	16	107
Net loss	$ (4,971)	$ (9,175)	$ (14,774)	$ (18,212)
Net loss per share - basic and diluted	$ (0.26)	$ (0.69)	$ (0.82)	$ (1.39)
Weighted-average shares outstanding - basic and diluted	19,167	13,272	18,097	13,056