Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Details)

v3.10.0.1
Summary of Significant Accounting Policies - Additional Information (Details)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
primary_source
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Jun. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
primary_source
Sep. 30, 2017
USD ($)
Jan. 01, 2018
USD ($)
Schedule Of Significant Accounting Policies [Line Items]                      
Property, equipment, and software, net $ 151,213     $ 148,428         $ 151,213    
Sales and marketing (43,179)       $ (36,802)       (121,523) $ (102,548)  
Bad debt expense $ 900       900       $ 3,000 $ 2,200  
Primary sources of revenue | primary_source 2               2    
Deferred tax assets, net $ 42,397     44,887         $ 42,397   $ 44,107
Deferred commissions period of benefit 3 years               3 years    
Length of Expected Customer Benefit of License Fees Billed at Initial Order Date                      
Schedule Of Significant Accounting Policies [Line Items]                      
Expected length of time of benefit from license fees                 3 years    
United States                      
Schedule Of Significant Accounting Policies [Line Items]                      
Property, equipment, and software, net $ 141,200     140,000         $ 141,200    
International Subsidiaries                      
Schedule Of Significant Accounting Policies [Line Items]                      
Property, equipment, and software, net $ 10,000     8,400         $ 10,000    
Minimum                      
Schedule Of Significant Accounting Policies [Line Items]                      
Contract duration                 1 year    
Correction Of Amortization Of Intangibles                      
Schedule Of Significant Accounting Policies [Line Items]                      
Cost of revenue   $ 5,300 $ 4,500 3,000 1,900 $ 1,100 $ 800 $ 9,800      
Sales and marketing   $ 5,300 $ 4,500 $ 3,000 $ 1,900 $ 1,100 $ 800 $ 9,800 $ 9,800