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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Finite-Lived Intangible Assets [Line Items]        
Amortization expense $ 0.8 $ 0.3 $ 1.9 $ 0.8
Mobilisafe Product [Member]        
Finite-Lived Intangible Assets [Line Items]        
Amortization expense     0.2  
Write-down of intangible assets     $ 2.3