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Stock-Based Compensation (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Recognition of stock-based compensation expense        
Stock-based compensation expense $ 674 $ 451 $ 1,216 $ 923
Research and development [Member]
       
Recognition of stock-based compensation expense        
Stock-based compensation expense 146 111 277 220
Selling, general and administrative [Member]
       
Recognition of stock-based compensation expense        
Stock-based compensation expense $ 528 $ 340 $ 939 $ 703