Annual report pursuant to Section 13 and 15(d)

Summary of Disaggregation of Revenues Related to Geographic Areas (Detail)

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Summary of Disaggregation of Revenues Related to Geographic Areas (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation Of Revenue [Line Items]      
Net revenue $ 22,780 $ 37,799 $ 46,155
United States      
Disaggregation Of Revenue [Line Items]      
Net revenue 16,195 22,814 28,661
International      
Disaggregation Of Revenue [Line Items]      
Net revenue $ 6,585 $ 14,985 $ 17,494