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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Capitalized Computer Software [Line Items]        
Software development costs capitalized $ 2,380 $ 1,988 $ 6,281 $ 4,588
Stock-based compensation included in capitalized software development costs 414 326 1,237 832
Amortization of software development costs $ 1,545 $ 1,143 $ 4,391 $ 3,822