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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per 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 revenue $ 10,150 $ 9,224 $ 19,883 $ 17,915
Cost of product revenue 5,747 5,574 10,837 11,088
Gross profit on product revenue 4,403 3,650 9,046 6,827
Government grants and cooperative agreements revenue 0 0 0 91
Operating expenses:        
Research and development 3,506 1,712 6,206 3,536
Selling, general and administrative 7,954 6,686 14,807 12,652
Amortization of intangible assets 51 51 101 101
Total operating expenses 11,511 8,449 21,114 16,289
Loss from operations (7,108) (4,799) (12,068) (9,371)
Non-operating income (expense), net:        
Revaluation of warrant liability 686 3,674 (4,387) (787)
Foreign exchange loss (157) (611) (211) (240)
Interest expense (107) (135) (238) (274)
Other income (expense), net 16 5 33 7
Total non-operating income (expense), net 438 2,933 (4,803) (1,294)
Loss before income taxes (6,670) (1,866) (16,871) (10,665)
Provision for income taxes 54 41 105 76
Net loss $ (6,724) $ (1,907) $ (16,976) $ (10,741)
Net loss per common share:        
Basic $ (0.10) $ (0.04) $ (0.26) $ (0.20)
Diluted $ (0.10) $ (0.10) $ (0.26) $ (0.20)
Weighted average common shares outstanding used for calculating net loss per common share:        
Basic 69,727 54,418 64,756 53,753
Diluted 71,928 55,236 64,756 53,753