Annual report pursuant to Section 13 and 15(d)

Summary of Long-Lived Assets by Geographic Location (Detail)

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Summary of Long-Lived Assets by Geographic Location (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Property, plant, and equipment, net $ 3,674 $ 4,478 $ 3,727
United States      
Segment Reporting Information [Line Items]      
Property, plant, and equipment, net 3,347 4,175 3,401
International      
Segment Reporting Information [Line Items]      
Property, plant, and equipment, net $ 327 $ 302 $ 326