Fair Value Measurement - Additional Information (Detail) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Financial assets, fair value	$ 0	$ 0
Financial liabilities, fair value	0	0
Carrying value	97,741,000	90,775,000
DEG Vietnam Loan
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying value	15,000,000
Fair value	15,056,000
DEG China Loan
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying value	3,497,000	4,805,000
Fair value	$ 3,588,000	$ 4,937,000