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Income and Expenses Items - Summary of Depreciation, Amortization and Lease Expense Included in Consolidated Income Statements (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Other Operating Income Expense [Line Items]      
Depreciation – right-of-use assets $ 507    
Amortization - prepaid land lease payment   $ 38 $ 35
Depreciation - investment property 33 35  
Depreciation, amortization and lease expense 5,498 5,418 5,465
Included in cost of sales [Member]      
Disclosure Of Other Operating Income Expense [Line Items]      
Depreciation – tangible assets 4,089 4,162 4,148
Depreciation – right-of-use assets 135    
Amortization – intangible assets 10 9 9
Operating lease expenses 3 16 15
Included in general and administrative expenses [Member]      
Disclosure Of Other Operating Income Expense [Line Items]      
Depreciation – tangible assets 552 598 657
Depreciation – right-of-use assets 260    
Amortization – intangible assets 39 34 40
Amortization - prepaid land lease payment   38 35
Depreciation - investment property 33 35 35
Operating lease expenses 170 200 201
Included in selling expenses [Member]      
Disclosure Of Other Operating Income Expense [Line Items]      
Depreciation – tangible assets 93 141 132
Depreciation – right-of-use assets 112    
Amortization – intangible assets 1 1  
Operating lease expenses $ 1 $ 184 $ 193