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, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Property, plant, and equipment, net $ 782 $ 1,193 $ 1,975
United States      
Segment Reporting Information [Line Items]      
Property, plant, and equipment, net 486 908 1,673
International      
Segment Reporting Information [Line Items]      
Property, plant, and equipment, net $ 296 $ 285 $ 302