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Condensed Consolidated Statements of Operations (Unaudited) (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
Revenue:        
Product revenue $ 8,252 $ 7,770 $ 26,167 $ 20,706
Government grants and cooperative agreements 0 1,479 91 1,915
Total revenue 8,252 9,249 26,258 22,621
Cost of product revenue 4,411 4,726 15,499 12,329
Gross profit 3,841 4,523 10,759 10,292
Operating expenses:        
Research and development 1,903 1,814 5,439 5,616
Selling, general and administrative 6,219 5,380 18,871 17,115
Amortization of intangible assets 50 51 151 152
Total operating expenses 8,172 7,245 24,461 22,883
Loss from operations (4,331) (2,722) (13,702) (12,591)
Non-operating income (expense), net:        
Revaluation of warrant liability 873 5,439 86 3,822
Foreign exchange gain (loss) 206 (41) (212) 394
Interest expense (136) (394) (410) (847)
Other income (expense), net (72) (22) 37 (25)
Total non-operating income (expense), net 871 4,982 (499) 3,344
Net income (loss) $ (3,460) $ 2,260 $ (14,201) $ (9,247)
Net income (loss) per common share:        
Basic $ (0.06) $ 0.05 $ (0.26) $ (0.19)
Diluted $ (0.08) $ 0.05 $ (0.26) $ (0.19)
Weighted average common shares outstanding used for calculating net income (loss) per common share:        
Basic 54,875 47,710 54,130 47,600
Diluted 55,377 48,820 54,130 47,600