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Stock-Based Compensation (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Summary of stock-based compensation expense        
Share-based compensation expense $ 753 $ 2,317 $ 1,339 $ 2,351
Remaining unamortized expense of stock-based compensation 2,401   2,401  
Product research and development [Member]
       
Summary of stock-based compensation expense        
Share-based compensation expense 58 178 118 187
Sales and marketing [Member]
       
Summary of stock-based compensation expense        
Share-based compensation expense 194 918 385 943
General and administrative [Member]
       
Summary of stock-based compensation expense        
Share-based compensation expense $ 501 $ 1,221 $ 836 $ 1,221