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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance $ 41,418 $ 42,326  
Impairment of property, plant and equipment (546) (11) $ (223)
Ending balance 41,747 41,418 42,326
Gross carrying amount [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 170,704 170,470  
Additions 3,406 4,498  
Disposals (3,167) (2,121)  
Transfer 64    
Exchange differences 11,944 (2,143)  
Ending balance 182,759 170,704 170,470
Gross carrying amount [Member] | Effects on initial application of IFRS 16 [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Effects on initial application of IFRS 16   (192)  
Gross carrying amount [Member] | Adjusted Balance [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 170,512    
Ending balance   170,512  
Accumulated depreciation [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (129,286) (128,144)  
Depreciation charge for the year (4,734) (4,901)  
Impairment of property, plant and equipment (546) (11)  
Disposals 3,084 2,114  
Transfer (64)    
Exchange differences (9,592) 1,656  
Ending balance (141,012) (129,286) (128,144)
Accumulated depreciation [Member] | Effects on initial application of IFRS 16 [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Effects on initial application of IFRS 16   126  
Accumulated depreciation [Member] | Adjusted Balance [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (129,160)    
Ending balance   (129,160)  
Land [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 6,206 6,227  
Ending balance 6,838 6,206 6,227
Land [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 6,206 6,227  
Exchange differences 632 (21)  
Ending balance 6,838 6,206 6,227
Land [Member] | Gross carrying amount [Member] | Adjusted Balance [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 6,206    
Ending balance   6,206  
Buildings [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 14,160 15,339  
Ending balance 13,673 14,160 15,339
Buildings [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 47,890 48,421  
Additions 7 229  
Disposals   (8)  
Transfer (167)    
Exchange differences 2,813 (752)  
Ending balance 50,543 47,890 48,421
Buildings [Member] | Gross carrying amount [Member] | Adjusted Balance [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 47,890    
Ending balance   47,890  
Buildings [Member] | Accumulated depreciation [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (33,730) (33,082)  
Depreciation charge for the year (1,044) (1,164)  
Disposals   6  
Transfer 265    
Exchange differences (2,361) 510  
Ending balance (36,870) (33,730) (33,082)
Buildings [Member] | Accumulated depreciation [Member] | Adjusted Balance [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (33,730)    
Ending balance   (33,730)  
Building improvement [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 2,148 2,368  
Ending balance 2,566 2,148 2,368
Building improvement [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 5,715 5,622  
Additions 119 76  
Disposals (4)    
Transfer 746 3  
Exchange differences 454 14  
Ending balance 7,030 5,715 5,622
Building improvement [Member] | Gross carrying amount [Member] | Adjusted Balance [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 5,715    
Ending balance   5,715  
Building improvement [Member] | Accumulated depreciation [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (3,567) (3,254)  
Depreciation charge for the year (338) (296)  
Impairment of property, plant and equipment (1)    
Disposals 4 0  
Transfer (265)    
Exchange differences (297) (17)  
Ending balance (4,464) (3,567) (3,254)
Building improvement [Member] | Accumulated depreciation [Member] | Adjusted Balance [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (3,567)    
Ending balance   (3,567)  
Machinery and equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 13,770 14,474  
Ending balance 13,737 13,770 14,474
Machinery and equipment [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 96,718 96,964  
Additions 292 480  
Disposals (2,308) (1,120)  
Transfer 1,748 1,418  
Exchange differences 7,419 (1,024)  
Ending balance 103,869 96,718 96,964
Machinery and equipment [Member] | Gross carrying amount [Member] | Adjusted Balance [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 96,718    
Ending balance   96,718  
Machinery and equipment [Member] | Accumulated depreciation [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (82,948) (82,490)  
Depreciation charge for the year (2,391) (2,435)  
Impairment of property, plant and equipment (550) (10)  
Disposals 2,274 1,119  
Transfer   (46)  
Exchange differences (6,517) 914  
Ending balance (90,132) (82,948) (82,490)
Machinery and equipment [Member] | Accumulated depreciation [Member] | Adjusted Balance [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (82,948)    
Ending balance   (82,948)  
Motor vehicle and other asset and assets under finance lease [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 2,298 1,800  
Ending balance 2,347 2,298 1,800
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 5,780 5,230  
Additions 433 624  
Disposals (524) (503)  
Transfer 180 505  
Exchange differences 332 (76)  
Ending balance 6,009 5,780 5,230
Motor vehicle and other asset and assets under finance lease [Member] | Gross carrying amount [Member] | Effects on initial application of IFRS 16 [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Effects on initial application of IFRS 16   (192)  
Motor vehicle and other asset and assets under finance lease [Member] | Gross carrying amount [Member] | Adjusted Balance [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 5,588    
Ending balance   5,588  
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 (3,482) (3,430)  
Depreciation charge for the year (541) (604)  
Impairment of property, plant and equipment 7    
Disposals 477 503  
Transfer (64)    
Exchange differences (185) 49  
Ending balance (3,662) (3,482) (3,430)
Motor vehicle and other asset and assets under finance lease [Member] | Accumulated depreciation [Member] | Effects on initial application of IFRS 16 [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Effects on initial application of IFRS 16   126  
Motor vehicle and other asset and assets under finance lease [Member] | Accumulated depreciation [Member] | Adjusted Balance [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (3,356)    
Ending balance   (3,356)  
Office equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 1,163 1,071  
Ending balance 1,208 1,163 1,071
Office equipment [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 6,722 6,959  
Additions 315 395  
Disposals (331) (490)  
Transfer 139 102  
Exchange differences 247 (244)  
Ending balance 7,092 6,722 6,959
Office equipment [Member] | Gross carrying amount [Member] | Adjusted Balance [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 6,722    
Ending balance   6,722  
Office equipment [Member] | Accumulated depreciation [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (5,559) (5,888)  
Depreciation charge for the year (420) (402)  
Impairment of property, plant and equipment (2) (1)  
Disposals 329 486  
Transfer   46  
Exchange differences (232) 200  
Ending balance (5,884) (5,559) (5,888)
Office equipment [Member] | Accumulated depreciation [Member] | Adjusted Balance [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (5,559)    
Ending balance   (5,559)  
Construction in progress [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 1,673 1,047  
Ending balance 1,378 1,673 1,047
Construction in progress [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 1,673 1,047  
Additions 2,240 2,694  
Transfer (2,582) (2,028)  
Exchange differences 47 (40)  
Ending balance 1,378 1,673 $ 1,047
Construction in progress [Member] | Gross carrying amount [Member] | Adjusted Balance [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance $ 1,673    
Ending balance   $ 1,673