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Summary of Significant Accounting Policies - Summary of Capitalized Software Development Costs Exclusive of Costs Recorded within Property and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Capitalized Computer Software Net [Abstract]    
Gross capitalized software development costs $ 46,169 $ 33,360
Accumulated amortization (33,423) (24,600)
Capitalized software development costs, net $ 12,746 $ 8,760