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Summary of Capitalized Software Development Costs, Exclusive of those Recorded within Property and Equipment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Capitalized Computer Software Net [Abstract]    
Gross capitalized software development costs $ 31,433 $ 25,152
Accumulated amortization (22,867) (18,629)
Capitalized software development costs, net $ 8,566 $ 6,523