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Summary of Long-Lived Assets by Geographic Location (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]    
Property, plant, and equipment, net $ 3,856 $ 3,727
UNITED STATES    
Segment Reporting Information [Line Items]    
Property, plant, and equipment, net 3,531 3,401
International    
Segment Reporting Information [Line Items]    
Property, plant, and equipment, net $ 325 $ 326