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Capitalized Software Development Costs - Additional Information (Detail) - Capitalized Software Development Costs [Member]
3 Months Ended
Mar. 31, 2018
Minimum [Member]  
Capitalized Computer Software [Line Items]  
Property and equipment, estimated useful life 2 years
Maximum [Member]  
Capitalized Computer Software [Line Items]  
Property and equipment, estimated useful life 3 years