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Summary of Operations and Significant Accounting Policies (Details 5) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
item
Dec. 31, 2013
Revenue recognition    
Number of subscription or usage based plans 3  
Chargeback and sales refund allowances $ 595 $ 425
Period of revenue recognition for undelivered elements 1 year  
Estimated customer relationship period 3 years  
Subscription plans | Minimum
    
Revenue recognition    
Plan term 30 days  
Subscription plans | Maximum
    
Revenue recognition    
Plan term 1 year  
On Demand plans
    
Revenue recognition    
Plan term 1 year  
Credit-pack plans
    
Revenue recognition    
Plan term 1 year