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Capitalized Software Development Costs - Summary of Capitalized Software Development Costs Including Stock-Based Compensation and Amortization (Detail) - Software Development [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Capitalized Computer Software [Line Items]    
Software development costs capitalized $ 2,945 $ 1,902
Stock-based compensation included in capitalized software development costs 550 338
Amortization of capitalized software development costs $ 1,975 $ 1,369