Quarterly report pursuant to Section 13 or 15(d)

Summary of Sales by End Market (Detail)

v3.8.0.1
Summary of Sales by End Market (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disaggregation Of Revenue [Line Items]    
Revenue $ 10,020 $ 10,874
End-customer    
Disaggregation Of Revenue [Line Items]    
Revenue 6,107 7,145
Distributors    
Disaggregation Of Revenue [Line Items]    
Revenue $ 3,913 $ 3,729