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Intangible assets, net - Additional Information (Detail) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]        
Write-off of Purchased IP and capitalized litigation costs $ 4,055 $ 4,055    
Amortization expenses   12,084 $ 698 $ 6
Purchased intellectual property litigation costs and internally developed software ,capitalized   11,318 3,428  
Software Developed for Internal Use [Member]        
Finite-Lived Intangible Assets [Line Items]        
Intangible assets that have not started amortization   4,576    
Purchased intellectual property litigation costs and internally developed software ,capitalized   8,867 2,230  
Purchased IP and Capitalized Litigation Costs [Member]        
Finite-Lived Intangible Assets [Line Items]        
Purchased intellectual property litigation costs and internally developed software ,capitalized   $ 2,451 $ 1,198