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Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]    
Accumulated amortization $ (2,333) $ (940)
Intangible assets, net 4,919 6,312
Acquired Technology [Member]    
Finite Lived Intangible Assets [Line Items]    
Acquired intangible assets $ 7,252 $ 7,252
Acquired intangible assets, Weighted average remaining useful life 20 months