Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v2.4.0.8
Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2013
Entity
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Customer
Entity
Dec. 31, 2012
Customer
Dec. 31, 2011
Customer
Schedule Of Significant Accounting Policies [Line Items]                      
Operating income (loss)                 $ 21,559,000 $ 11,448,000 $ 1,810,000
Net income (loss) 2,178,000 12,886,000 4,610,000 1,018,000 3,722,000 2,113,000 (2,372,000) 1,720,000 20,692,000 5,183,000 (1,231,000)
Increase in basic and diluted earnings per share                 $ 0.03    
Impact of change in estimate of customer lives on on demand revenue                 2,800,000    
Impact of change in estimate of customer lives on net income                 1,500,000    
Impact of change in estimate of customer lives on earnings per share                 0.02    
Customers contribution to revenue                 4.00% 4.00% 4.00%
Number of customer accounted for 4% or more of revenue                 0 0 0
Primary sources of revenue 3               3    
Revenue recognition access period 3 years               3 years    
Renewal of additional term license                 1 year    
Capitalized product development costs                 7,600,000 3,400,000  
Amortization expense of development costs                 1,000,000 1,200,000 1,800,000
Advertising costs                 11,400,000 10,200,000 8,600,000
Software and Software Development Costs
                     
Schedule Of Significant Accounting Policies [Line Items]                      
Property plant and equipment, useful life                 3 years    
Unamortized Software Development Costs
                     
Schedule Of Significant Accounting Policies [Line Items]                      
Unamortized software development costs 12,600,000       5,900,000       12,600,000 5,900,000  
Minimum
                     
Schedule Of Significant Accounting Policies [Line Items]                      
Likelihood of tax benefits being realized                 50.00%    
North America
                     
Schedule Of Significant Accounting Policies [Line Items]                      
Net long-lived assets 51,500,000       29,900,000       51,500,000 29,900,000  
International Subsidiaries
                     
Schedule Of Significant Accounting Policies [Line Items]                      
Net long-lived assets 3,300,000       2,600,000       3,300,000 2,600,000  
Length of Expected Customer Benefit of License Fees Billed at Initial Order Date
                     
Schedule Of Significant Accounting Policies [Line Items]                      
Operating income (loss)                 3,500,000    
Net income (loss)                 $ 1,900,000