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Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Segment
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Apr. 21, 2014
USD ($)
Summary Of Significant Accounting Policy [Line Items]          
Number of operating segments | Segment   1      
Restricted cash   $ 0 $ 371,000    
Interest cost paid   $ 1,300,000 3,700,000 $ 9,000,000  
Interest cost capitalized     400,000 100,000  
Capitalized and amortized period   3 years 6 months      
Total capitalized payroll costs related to internal use software projects   $ 4,300,000 2,200,000    
Amortization expense related to capitalized software costs   1,800,000 900,000 600,000  
Goodwill impairment amount $ 0 0 0 0  
Impairment of intangible assets with finite lives   0 0 0  
Impairment of long-lived assets   $ 0 0 0  
Conversion fees, deferred revenue recognition period   10 years      
Advertising costs   $ 3,600,000 4,200,000 3,400,000  
Sales taxes   3,700,000 3,000,000 2,200,000  
Deferred tax liability charged on equity     200,000    
Tax benefit charged on equity   $ (1,020,000) 2,275,000 $ 517,000  
Internal use Software [Member]          
Summary Of Significant Accounting Policy [Line Items]          
Capitalized and amortized period   3 years      
Maximum [Member]          
Summary Of Significant Accounting Policy [Line Items]          
Interest cost capitalized   $ 100,000      
IPO [Member]          
Summary Of Significant Accounting Policy [Line Items]          
Deferred offering costs         $ 2,100,000
Tax benefit charged on equity     700,000    
Current Deferred Income Tax Assets [Member]          
Summary Of Significant Accounting Policy [Line Items]          
Change in adoption of recent accounting pronouncements on deferred tax     (1,400,000)    
Non Current Deferred Income Tax Liabilities [Member]          
Summary Of Significant Accounting Policy [Line Items]          
Change in adoption of recent accounting pronouncements on deferred tax     $ (1,400,000)