Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Product revenue	$ 1,529	$ 886
Contract revenue	201	233
Total revenue	1,730	1,119
Cost of product revenue	4,175	2,240
Cost of contract revenue	155	299
Total cost of revenue	4,330	2,539
Gross margin	(2,600)	(1,420)
Research and development expense	3,940	4,327
Sales, marketing, general and administrative expense	3,288	3,299
Gain on disposal of fixed assets	0	(7)
Total operating expenses	7,228	7,619
Loss from operations	(9,828)	(9,039)
Interest income	10	15
Interest expense	(9)	(13)
Other income (expense)	24	0
Net loss	$ (9,803)	$ (9,037)
Net loss per share - basic and diluted	$ (0.58)	$ (0.70)
Weighted-average shares outstanding - basic and diluted	17,027	12,837