Quarterly report pursuant to Section 13 or 15(d)

Summary of Property, Plant and Equipment by Geographic Location (Detail)

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Summary of Property, Plant and Equipment by Geographic Location (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]    
Property, plant, and equipment, net $ 4,350 $ 4,478
United States    
Segment Reporting Information [Line Items]    
Property, plant, and equipment, net 4,021 4,176
International    
Segment Reporting Information [Line Items]    
Property, plant, and equipment, net $ 329 $ 302