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Other Assets - Summary of Other Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Categories of current financial assets [abstract]    
Patronage stock $ 386 $ 437
Note receivable (note 13) 64 70
Security deposits 540 538
Cash surrender value-insurance 929 924
Other 288 35
Total $ 2,207 $ 2,004