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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Revenue:    
Product revenue $ 9,733 $ 8,691
Cost of product revenue 5,090 5,514
Gross profit on product revenue 4,643 3,177
Government grants and cooperative agreements revenue 0 91
Operating expenses:    
Research and development 2,700 1,824
Selling, general and administrative 6,853 5,966
Amortization of intangible assets 50 50
Total operating expenses 9,603 7,840
Loss from operations (4,960) (4,572)
Non-operating expense, net:    
Loss from revaluation of warrant liability (5,073) (4,461)
Foreign exchange gain (loss) (54) 371
Interest expense (131) (139)
Other income, net 17 2
Total non-operating expense, net (5,241) (4,227)
Loss before income taxes (10,201) (8,799)
Provision for income taxes 51 35
Net loss $ (10,252) $ (8,834)
Net loss per common share:    
Basic $ (0.17) $ (0.17)
Diluted $ (0.17) $ (0.17)
Weighted average common shares outstanding used for calculating net loss per common share:    
Basic 59,730 53,088
Diluted 59,730 53,088