Condensed Consolidated Statements Of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenue:
Product	$ 6,309	$ 6,306	$ 19,263	$ 16,564
Contract	1,201	1,957	2,971	4,589
Total revenue, net	7,510	8,263	22,234	21,153
Cost of goods sold:
Product	3,132	2,902	9,914	8,554
Contract	729	1,002	1,477	2,368
Total cost of goods sold	3,861	3,904	11,391	10,922
Gross profit	3,649	4,359	10,843	10,231
Operating expenses:
Research and development	1,173	765	3,571	2,071
Selling, general and administrative	1,918	1,992	6,525	6,361
Total operating expenses	3,091	2,757	10,096	8,432
Income from operations	558	1,602	747	1,799
Other income (expense):
Interest expense	(10)	(26)	(18)	(85)
Other income, net	13	3	32	32
Change in the fair value of warrant liability		3,028		2,548
Total other income (expense), net	3	3,005	14	2,495
Income before provision for income taxes	561	4,607	761	4,294
Provision for income taxes	221	488	295	542
Net income	340	4,119	466	3,752
Less net income allocated to participating securities	83	1,015	113	954
Net income allocated to common shares	$ 257	$ 3,104	$ 353	$ 2,798
Income per share, basic	$ 0.01	$ 0.13	$ 0.02	$ 0.13
Income per share, diluted	$ 0.01	$ 0.03	$ 0.01	$ 0.02
Weighted average number of shares outstanding:
Basic	23,444,361	23,084,229	23,473,770	22,153,525
Diluted	25,393,035	25,322,920	25,360,864	25,642,105