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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disaggregation Of Revenue [Line Items]        
Net revenue $ 2,938 $ 8,645 $ 7,721 $ 18,971
End-customer        
Disaggregation Of Revenue [Line Items]        
Net revenue 2,402 5,553 5,741 11,254
Distributors        
Disaggregation Of Revenue [Line Items]        
Net revenue $ 536 $ 3,092 $ 1,980 $ 7,717