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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Revenue:    
Product revenue $ 7,866 $ 9,733
Cost of product revenue 4,157 5,090
Gross profit on product revenue 3,709 4,643
Operating expenses:    
Research and development 4,642 2,700
Selling, general and administrative 8,236 6,853
Amortization of intangible assets 50 50
Total operating expenses 12,928 9,603
Loss from operations (9,219) (4,960)
Non-operating gain (expense), net:    
Gain (loss) from revaluation of warrant liability 9,034 (5,073)
Foreign exchange gain (loss) 21 (54)
Interest expense (193) (131)
Other income, net 170 17
Total non-operating gain (expense), net 9,032 (5,241)
Loss before income taxes (187) (10,201)
Provision for income taxes 38 51
Net loss $ (225) $ (10,252)
Net loss per share:    
Basic $ 0.00 $ (0.17)
Diluted $ (0.12) $ (0.17)
Weighted average shares outstanding used for calculating net loss per share:    
Basic 72,088 59,730
Diluted 75,158 59,730