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Intangible assets, net - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 18, 2017
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items]            
Write-off of long-lived assets $ 3,626 $ 0 $ 0   $ 0 $ 3,626
Amortization expense   3,228 $ 3,146   9,653 $ 9,404
Software Developed for Internal Use            
Finite-Lived Intangible Assets [Line Items]            
Intangible assets that have not started amortization   $ 2,101     $ 2,101  
Q Interactive Acquisition | Acquired Proprietary Technology and Trade Names            
Finite-Lived Intangible Assets [Line Items]            
Write-off of long-lived assets       $ 3,626