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Summary of Capitalized Software Development Costs, Exclusive of those Recorded within Property and Equipment (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Capitalized Computer Software Net [Abstract]    
Gross capitalized software development costs $ 36,305 $ 33,360
Accumulated amortization (26,420) (24,600)
Capitalized software development costs, net $ 9,885 $ 8,760