Quarterly report pursuant to Section 13 or 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
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Disaggregation Of Revenue [Line Items]        
Net revenue $ 6,539 $ 8,646 $ 14,260 $ 27,617
United States        
Disaggregation Of Revenue [Line Items]        
Net revenue 4,755 4,949 10,079 16,962
International        
Disaggregation Of Revenue [Line Items]        
Net revenue $ 1,784 $ 3,697 $ 4,181 $ 10,655