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Stockholders' Equity and Stock-Based Compensation (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Stock-based compensation expense        
Stock-based compensation expense $ 1,414,000 $ 1,388,000 $ 2,799,000 $ 2,479,000
Cost of revenue [Member]
       
Stock-based compensation expense        
Stock-based compensation expense 38,000 28,000 66,000 52,000
Sales and marketing [Member]
       
Stock-based compensation expense        
Stock-based compensation expense 276,000 247,000 550,000 444,000
General and administrative [Member]
       
Stock-based compensation expense        
Stock-based compensation expense 1,088,000 1,097,000 2,157,000 1,949,000
Research and development [Member]
       
Stock-based compensation expense        
Stock-based compensation expense $ 12,000 $ 16,000 $ 26,000 $ 34,000