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Segment Reporting - Long-Lived Assets Consisting of Property and Equipment, Net by Geographic Regions (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]    
Long-lived assets $ 2,055 $ 2,075
North America [Member]    
Segment Reporting Information [Line Items]    
Long-lived assets 1,256 1,206
Europe [Member]    
Segment Reporting Information [Line Items]    
Long-lived assets 713 776
Australia [Member]    
Segment Reporting Information [Line Items]    
Long-lived assets $ 86 $ 93