Condensed Consolidated Statements Of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenue:
Product	$ 5,830	$ 4,310
Contract	307	1,131
Total revenue, net	6,137	5,441
Cost of goods sold:
Product	3,302	2,609
Contract	154	586
Total cost of goods sold	3,456	3,195
Gross profit	2,681	2,246
Operating expenses:
Research and development	1,140	532
Selling, general and administrative	2,263	2,141
Total operating expenses	3,403	2,673
Loss from operations	(722)	(427)
Other income (expense):
Interest expense, net	(3)	(29)
Other income, net	7	16
Change in the fair value of warrant liability		(3,057)
Total other income (expense), net	4	(3,070)
Loss before benefit from income taxes	(718)	(3,497)
Benefit from income taxes	(266)	(158)
Net loss	$ (452)	$ (3,339)
Loss per common share, basic	$ (0.02)	$ (0.16)
Loss per common share, diluted	$ (0.02)	$ (0.16)
Weighted average number of shares outstanding:
Basic	23,507,172	21,522,716
Diluted	23,507,172	21,522,716