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Comprehensive Income
6 Months Ended
Jun. 30, 2011
Comprehensive Income [Abstract]  
Comprehensive Income
13. Comprehensive Income
          Comprehensive income includes unrealized gains and losses on short-term investments of U.S. government agency and government sponsored enterprise debt and equity securities. The following table sets forth the calculation of comprehensive income (in thousands):
                                 
    Three Months Ended June 30,     Six Months Ended June 30,  
    2011     2010     2011     2010  
    (unaudited)     (unaudited)  
Net income (loss)
  $ (7,847 )   $ 1,885     $ (15,600 )   $ 3,477  
Change in unrealized gain (loss) on investments, net
    (5 )     7       (1 )     (12 )
 
                       
Total comprehensive income (loss)
  $ (7,852 )   $ 1,892     $ (15,601 )   $ 3,465