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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance $ 42,326 $ 39,637  
Impairment of property, plant and equipment (11) (223) $ (2,524)
Ending balance 41,418 42,326 39,637
Gross carrying amount [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 170,470 155,347  
Additions 4,498 4,933  
Disposals (2,121) (5,519)  
Exchange differences (2,143) 15,709  
Ending balance 170,704 170,470 155,347
Accumulated depreciation [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (128,144) (115,710)  
Depreciation charge for the year (4,901) (4,937)  
Impairment of property, plant and equipment (11) (223)  
Disposals 2,114 5,108  
Exchange differences 1,656 (12,382)  
Ending balance (129,286) (128,144) (115,710)
Land [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 6,227 4,449  
Ending balance 6,206 6,227 4,449
Land [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 6,227 4,449  
Additions   1,120  
Exchange differences (21) 658  
Ending balance 6,206 6,227 4,449
Buildings [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 15,339 15,623  
Ending balance 14,160 15,339 15,623
Buildings [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 48,421 44,235  
Additions 229 34  
Disposals (8)    
Exchange differences (752) 4,152  
Ending balance 47,890 48,421 44,235
Buildings [Member] | Accumulated depreciation [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (33,082) (28,612)  
Depreciation charge for the year (1,164) (1,356)  
Disposals 6    
Exchange differences 510 (3,114)  
Ending balance (33,730) (33,082) (28,612)
Building improvement [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 2,368 2,130  
Ending balance 2,148 2,368 2,130
Building improvement [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 5,622 4,861  
Additions 76 19  
Transfer 3 292  
Exchange differences 14 450  
Ending balance 5,715 5,622 4,861
Building improvement [Member] | Accumulated depreciation [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (3,254) (2,731)  
Depreciation charge for the year (296) (254)  
Exchange differences (17) (269)  
Ending balance (3,567) (3,254) (2,731)
Machinery and equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 14,474 13,415  
Ending balance 13,770 14,474 13,415
Machinery and equipment [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 96,964 88,897  
Additions 480 400  
Disposals (1,120) (4,392)  
Transfer 1,418 2,600  
Exchange differences (1,024) 9,459  
Ending balance 96,718 96,964 88,897
Machinery and equipment [Member] | Accumulated depreciation [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (82,490) (75,482)  
Depreciation charge for the year (2,435) (2,513)  
Impairment of property, plant and equipment (10) (217)  
Disposals 1,119 4,024  
Transfer (46)    
Exchange differences 914 (8,302)  
Ending balance (82,948) (82,490) (75,482)
Motor vehicle and other asset and assets under finance lease [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 1,800 1,086  
Ending balance 2,298 1,800 1,086
Motor vehicle and other asset and assets under finance lease [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 5,230 4,608  
Additions 624 1,119  
Disposals (503) (914)  
Transfer 505    
Exchange differences (76) 417  
Ending balance 5,780 5,230 4,608
Motor vehicle and other asset and assets under finance lease [Member] | Accumulated depreciation [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (3,430) (3,522)  
Depreciation charge for the year (604) (477)  
Disposals 503 877  
Exchange differences 49 (308)  
Ending balance (3,482) (3,430) (3,522)
Office equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 1,071 864  
Ending balance 1,163 1,071 864
Office equipment [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 6,959 6,227  
Additions 395 396  
Disposals (490) (213)  
Transfer 102 124  
Exchange differences (244) 425  
Ending balance 6,722 6,959 6,227
Office equipment [Member] | Accumulated depreciation [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (5,888) (5,363)  
Depreciation charge for the year (402) (337)  
Impairment of property, plant and equipment (1) (6)  
Disposals 486 207  
Transfer 46    
Exchange differences 200 (389)  
Ending balance (5,559) (5,888) (5,363)
Construction in progress [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 1,047 2,070  
Ending balance 1,673 1,047 2,070
Construction in progress [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 1,047 2,070  
Additions 2,694 1,845  
Transfer (2,028) (3,016)  
Exchange differences (40) 148  
Ending balance $ 1,673 $ 1,047 $ 2,070