Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Product revenue	$ 2,015	$ 1,525	$ 4,294	$ 3,315
Contract revenue	515	314	1,261	798
Royalty revenue	83	0	83	0
Total revenue	2,613	1,839	5,638	4,113
Cost of product revenue	887	2,483	4,781	7,708
Cost of contract revenue	251	237	654	931
Total cost of revenue	1,138	2,720	5,435	8,639
Gross margin	1,475	(881)	203	(4,526)
Research and development expense	3,097	3,641	10,264	11,446
Sales, marketing, general and administrative expense	2,425	3,306	8,777	10,182
Gain on disposal of fixed assets	(46)	(4)	(47)	(11)
Total operating expenses	5,476	6,943	18,994	21,617
Loss from operations	(4,001)	(7,824)	(18,791)	(26,143)
Other income (expense)	156	34	172	141
Net loss	$ (3,845)	$ (7,790)	$ (18,619)	$ (26,002)
Net loss per share - basic and diluted	$ (0.15)	$ (0.57)	$ (0.91)	$ (1.96)
Weighted-average shares outstanding - basic and diluted	24,974	13,655	20,406	13,258