Summary of Sales by End Market (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation Of Revenue [Line Items]
Net revenue	$ 8,116	$ 4,783
End-customer
Disaggregation Of Revenue [Line Items]
Net revenue	5,221	2,340
Distributors
Disaggregation Of Revenue [Line Items]
Net revenue	$ 2,895	$ 2,443