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Commitments and Contingencies - Additional Information (Detail) - USD ($)
 12 Months Ended
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]        
Rental expenses   $ 1,378,000 $ 365,000 $ 11,000
Data and media costs incurred   3,200,000 $ 924,000 $ 0
Capital commitment under non-cancellable data licensing agreements, Total   16,728,000    
Purchased IP and Capitalized Litigation Costs [Member]        
Finite-Lived Intangible Assets [Line Items]        
Intangible assets written off $ 4,055,000      
Minimum [Member]        
Finite-Lived Intangible Assets [Line Items]        
Estimated possible loss from pending litigation   3,000,000    
Maximum [Member]        
Finite-Lived Intangible Assets [Line Items]        
Estimated possible loss from pending litigation   $ 6,000,000