Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets, Net - Summary of Intangible Assets, Net (Detail)

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Goodwill and Intangible Assets, Net - Summary of Intangible Assets, Net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Intangible assets $ 4,889 $ 3,505
Less: accumulated amortization (1,916) (351)
Intangible assets, net 2,973 3,154
Acquired Software and Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets 4,208 3,004
Capitalized Software [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets 402 471
Other [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets $ 279 $ 30