Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Details)

v2.4.0.8
Summary of Significant Accounting Policies - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Entity
Jun. 30, 2013
Jun. 30, 2014
Entity
Jun. 30, 2013
Jun. 30, 2014
Length of Expected Customer Benefit of License Fees Billed at Initial Order Date
Jun. 30, 2014
North America
Dec. 31, 2013
North America
Jun. 30, 2014
International Subsidiaries
Dec. 31, 2013
International Subsidiaries
Jun. 30, 2014
Customer Concentration Risk
Revenue
Customer
Jun. 30, 2013
Customer Concentration Risk
Revenue
Customer
Jun. 30, 2014
Customer Concentration Risk
Revenue
Customer
Jun. 30, 2013
Customer Concentration Risk
Revenue
Customer
Jun. 30, 2014
Customer Concentration Risk
Accounts receivable
Customer
Jun. 30, 2013
Customer Concentration Risk
Accounts receivable
Customer
Jun. 30, 2014
Customer Concentration Risk
Accounts receivable
Customer
Jun. 30, 2013
Customer Concentration Risk
Accounts receivable
Customer
Schedule Of Significant Accounting Policies [Line Items]                                  
Net long-lived assets           $ 62.5 $ 51.5 $ 4.0 $ 3.3                
Primary sources of revenue 3   3                            
Expected length of time of benefit from license fees         3 years                        
Renewal of additional term license     1 year                            
Concentration risk threshold, percentage 5.00% 5.00% 5.00% 5.00%                          
Number of customers accounted for 5% or more of revenue                   0 0 0 0        
Number of customers accounted for 5% or more of account receivable                           0 0 0 0