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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Revenue:        
Product revenue $ 9,224 $ 6,753 $ 17,915 $ 12,936
Government grants and cooperative agreements 0 0 91 436
Total revenue 9,224 6,753 18,006 13,372
Cost of product revenue 5,574 4,074 11,088 7,603
Gross profit 3,650 2,679 6,918 5,769
Operating expenses:        
Research and development 1,712 1,994 3,536 3,802
Selling, general and administrative 6,686 6,207 12,652 11,735
Amortization of intangible assets 51 51 101 101
Total operating expenses 8,449 8,252 16,289 15,638
Loss from operations (4,799) (5,573) (9,371) (9,869)
Non-operating income (expense), net:        
Revaluation of warrant liability 3,674 (339) (787) (1,617)
Foreign exchange gain (loss) (748) (258) (418) 435
Interest expense (135) (220) (274) (453)
Other income (expense), net 101 (19) 109 (3)
Total non-operating income (expense), net 2,892 (836) (1,370) (1,638)
Net loss $ (1,907) $ (6,409) $ (10,741) $ (11,507)
Net loss per common share:        
Basic $ (0.04) $ (0.13) $ (0.20) $ (0.24)
Diluted $ (0.10) $ (0.13) $ (0.20) $ (0.24)
Weighted average common shares outstanding used for calculating net loss per common share:        
Basic 54,418 47,620 53,753 47,530
Diluted 55,236 47,620 53,753 47,530