Quarterly report pursuant to Section 13 or 15(d)

Summary of Sales by End Market (Detail)

v3.20.2
Summary of Sales by End Market (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
End-customer        
Disaggregation Of Revenue [Line Items]        
Net revenue 5,087 3,727 9,845 11,068
Distributors        
Disaggregation Of Revenue [Line Items]        
Net revenue $ 1,452 $ 4,919 $ 4,415 $ 16,549