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Accounting for Stock-based Compensation (Details Textual) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Accounting for Stock Based Compensation (Textual) [Abstract]    
Share based payment award , vesting period 4 years  
Fair value of restricted stock units   $ 1,190,600,000
Number of restricted stock options   1,798,000
Weighted average vesting period for unrecognized compensation cost   2 years 2 months 12 days
Stock Options [Member]
   
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Unrecognized compensation cost related to non vested stock options 14,500,000 14,500,000
Amount from restricted stock options   2,700,000
Restricted Stock Units (RSUs) [Member]
   
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Unrecognized compensation cost related to non vested stock options 12,700,000 12,700,000
Unrecognized expenses milestones not considered probable of achievement 3,700,000 3,700,000
Fair value per share of stock options   $ 2.32
Amount from restricted stock options   2,800,000
Performance Options [Member]
   
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Unrecognized expenses milestones not considered probable of achievement 107,000 $ 107,000
Fair value per share of stock options   $ 1.54