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Comprehensive Loss
9 Months Ended
Sep. 30, 2011
Comprehensive Loss [Abstract] 
Comprehensive Loss

9. Comprehensive Loss

Comprehensive loss is defined as the change in equity of a business enterprise during a period from transactions and other events and circumstances from non-owner sources. The Company's comprehensive loss includes net loss and unrealized gains and losses on available-for-sale securities. Total comprehensive loss for the nine months ended September 30, 2011 and 2010 was $19.8 million and $13.0 million, respectively.