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Research and Development Costs - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Research and Development [Abstract]        
Research and development costs related to software development $ 2.0 $ 3.3 $ 7.9 $ 11.8