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, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]      
Property, plant, and equipment, net $ 1,193 $ 1,975 $ 3,674
United States      
Segment Reporting Information [Line Items]      
Property, plant, and equipment, net 908 1,673 3,347
International      
Segment Reporting Information [Line Items]      
Property, plant, and equipment, net $ 285 $ 302 $ 327