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Intangible Assets (Detail)
3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
domain_name
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
domain_name
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Finite-Lived Intangible Assets [Line Items]                      
Intangible assets, net $ 0       $ 700,000       $ 0 $ 700,000  
Amortization of intangibles assets $ 700,000 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 700,000 $ 0 $ 0
Internet domain names                      
Finite-Lived Intangible Assets [Line Items]                      
Number of intangible asset domain names | domain_name 2               2    
Intangible assets, net $ 0 $ 700,000             $ 0    
Finite intangible assets, useful life (in years)                 3 months