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Note 5 - Stock-Based Compensation (Details) - Stock-based Compensation Expense (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
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 2,403 $ 1,015 $ 4,238 $ 1,793
Impact on basic and diluted net loss per common share (in Dollars per share) $ 0.01 $ 0.01 $ 0.01 $ 0.01
Research and Development Expense [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 402 360 544 664
General and Administrative Expense [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 2,001 $ 655 $ 3,694 $ 1,129