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COMPREHENSIVE LOSS
6 Months Ended
Jun. 30, 2011
Comprehensive Loss [Abstract]  
COMPREHENSIVE LOSS
4.    COMPREHENSIVE LOSS
 
Comprehensive loss is comprised of net loss and other comprehensive gain (loss). Other comprehensive income (loss) includes unrealized losses on our available-for-sale securities that are excluded from net loss. Total comprehensive loss for the three and six months ended June 30, 2011 and 2010 was as follows:
 
   
Three Months Ended
June 30,
   
Six Months Ended
June 30,
 
   
2011
   
2010
   
2011
   
2010
 
Net loss
  $ (10,804 )   $ (8,227 )   $ (12,270 )   $ (17,979 )
Unrealized gain (loss) on marketable securities
    101       (7 )     64       (36 )
Comprehensive loss
  $ (10,703 )   $ (8,234 )   $ (12,206 )   $ (18,015 )