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Principal Maturities of Debt (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Debt maturing in remainder of 2018 $ 2,992  
Debt maturing in 2019 3,485  
Debt maturing in 2020 2,500  
Debt maturing in 2021 96,500  
Debt maturing in 2022 2,500  
Debt maturing in 2023 1,250  
Total debt 109,227 $ 144,669
Revolving Note (U.S. Dollar)    
Debt Instrument [Line Items]    
Debt maturing in 2021 94,000  
Total debt 94,000 129,000
DEG China Loan    
Debt Instrument [Line Items]    
Debt maturing in remainder of 2018 492  
Debt maturing in 2019 985  
Total debt 1,477 1,919
DEG Vietnam Loan    
Debt Instrument [Line Items]    
Debt maturing in remainder of 2018 2,500  
Debt maturing in 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 $ 13,750 $ 13,750