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Business Combinations (Pro Forma Adjusted Summary) (Details) (Nexius, Nedstat, And Adxpose [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Nexius, Nedstat, And Adxpose [Member]
   
Business Acquisition [Line Items]    
Revenues $ 234,095 $ 189,704
Net loss $ (17,468) $ (12,504)
Basic loss per share to common stockholders $ (0.53) $ (0.39)
Diluted loss per share to common stockholders $ (0.53) $ (0.39)