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Intangible assets, net - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Finite-Lived Intangible Assets [Line Items]        
Amortization expenses $ 2,867 $ 16 $ 5,393 $ 28
Purchased IP and Capitalized Litigation Costs [Member]        
Finite-Lived Intangible Assets [Line Items]        
Intangible assets that have not started amortization 3,562   3,562  
Software Developed for Internal Use [Member]        
Finite-Lived Intangible Assets [Line Items]        
Intangible assets that have not started amortization $ 1,502   $ 1,502