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Net Income (Loss) Per Share (Details Textual)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Net Income (Loss) Per Share (Textual) [Abstract]        
Options and unvested restricted stock to purchase 2,463,000 5,316,000 2,819,000 7,924,000