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Segment Reporting - Long-Lived Assets Consisting of Property and Equipment, Net by Geographic Regions (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]    
Long-lived assets $ 3,022 $ 2,075
United States [Member]    
Segment Reporting Information [Line Items]    
Long-lived assets 2,168 1,206
Europe [Member]    
Segment Reporting Information [Line Items]    
Long-lived assets 690 776
Rest of The World [Member]    
Segment Reporting Information [Line Items]    
Long-lived assets $ 164 $ 93