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
Mar. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]    
Property, plant, and equipment, net $ 3,424 $ 3,674
United States    
Segment Reporting Information [Line Items]    
Property, plant, and equipment, net 3,088 3,347
International    
Segment Reporting Information [Line Items]    
Property, plant, and equipment, net $ 336 $ 327