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Stock-Based Compensation (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Recognition of stock-based compensation expense        
Stock-based compensation expense $ 695 $ 463 $ 1,911 $ 1,386
Research and development [Member]
       
Recognition of stock-based compensation expense        
Stock-based compensation expense 146 112 423 332
Selling, general and administrative [Member]
       
Recognition of stock-based compensation expense        
Stock-based compensation expense $ 549 $ 351 $ 1,488 $ 1,054