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Product Revenue (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Concentration Risk [Line Items]        
Net product sales $ 199,519 $ 5,039 $ 327,450 $ 9,466
Concentration risk, percentage (in hundredths) 79.00%   79.00%  
Activity of sales related deductions [Roll Forward]        
Balance     2,218  
Provision related to current period sales     26,476  
Credits/payments     (11,364)  
Balance 17,330   17,330  
Rebates and Chargebacks [Member]
       
Activity of sales related deductions [Roll Forward]        
Balance     585  
Provision related to current period sales     6,152  
Credits/payments     (1,957)  
Balance 4,780   4,780  
Distribution Related Fees [Member]
       
Activity of sales related deductions [Roll Forward]        
Balance     1,451  
Provision related to current period sales     17,917  
Credits/payments     (8,314)  
Balance 11,054   11,054  
Other Sales-Related Deductions [Member]
       
Activity of sales related deductions [Roll Forward]        
Balance     182  
Provision related to current period sales     2,407  
Credits/payments     (1,093)  
Balance 1,496   1,496  
EYLEA Net Product Sales [Member] | Product Concentration Risk [Member]
       
Concentration Risk [Line Items]        
Net product sales 194,000   317,500  
ARCALYST Net Product Sales [Member] | Product Concentration Risk [Member]
       
Concentration Risk [Line Items]        
Net product sales $ 5,500 $ 5,000 $ 9,900 $ 9,500