Condensed Consolidated Statements Of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenue:
Product	$ 6,773	$ 7,124	$ 14,901	$ 12,954
Contract	255	1,463	630	1,770
Total revenue, net	7,028	8,587	15,531	14,724
Cost of goods sold:
Product	4,437	3,480	8,974	6,782
Contract	200	594	416	748
Total cost of goods sold	4,637	4,074	9,390	7,530
Gross profit	2,391	4,513	6,141	7,194
Operating expenses:
Research and development	1,454	1,258	2,643	2,398
Selling, general and administrative	2,077	2,344	4,317	4,607
Total operating expenses	3,531	3,602	6,960	7,005
(Loss) Income from operations	(1,140)	911	(819)	189
Other income (expense):
Interest expense, net	(11)	(5)	(21)	(8)
Other income, net	23	12	36	18
Total other income (expense), net	12	7	15	10
(Loss) income before (benefit from) provision for income taxes	(1,128)	918	(804)	199
(Benefit from) provision for income taxes	(120)	341		74
Net (loss) income	(1,008)	577	(804)	125
Less net income allocated to participating securities		140		30
Net (loss) income allocated to common shares	$ (1,008)	$ 437	$ (804)	$ 95
(Loss) income per share, basic	$ (0.04)	$ 0.02	$ (0.03)	$ 0.00
(Loss) income per share, diluted	$ (0.04)	$ 0.02	$ (0.03)	$ 0.00
Weighted average number of shares outstanding:
Basic	23,586,413	23,469,777	23,556,743	23,488,475
Diluted	23,586,413	25,167,605	23,556,743	25,344,779