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Principal Maturities of Debt (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Debt maturing in remainder of 2019 $ 2,949  
Debt maturing in 2020 2,500  
Debt maturing in 2021 91,354  
Debt maturing in 2022 2,500  
Debt maturing in 2023 1,250  
Total debt 100,553 $ 139,890
US and Euro Denominated Revolving Note    
Debt Instrument [Line Items]    
Debt maturing in 2021 88,854  
Total debt 88,854  
DEG China Loan    
Debt Instrument [Line Items]    
Debt maturing in remainder of 2019 449  
Total debt 449 913
DEG Vietnam Loan    
Debt Instrument [Line Items]    
Debt maturing in remainder of 2019 2,500  
Debt maturing in 2020 2,500  
Debt maturing in 2021 2,500  
Debt maturing in 2022 2,500  
Debt maturing in 2023 1,250  
Total debt $ 11,250 $ 11,250