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Principal Maturities of Debt (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Debt maturing in remainder of 2019	$ 1,705
Debt maturing in 2020	2,500
Debt maturing in 2021	2,500
Debt maturing in 2022	2,500
Debt maturing in 2023	1,250
Debt maturing in 2024	96,893
Total debt	107,348	$ 139,890
US and Euro Denominated Revolving Note
Debt Instrument [Line Items]
Debt maturing in 2024	96,893
Total debt	96,893
DEG China Loan
Debt Instrument [Line Items]
Debt maturing in remainder of 2019	455
Total debt	455	913
DEG Vietnam Loan
Debt Instrument [Line Items]
Debt maturing in remainder of 2019	1,250
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	$ 10,000	$ 11,250

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