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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance $ 41,747 $ 41,418  
Impairment of property, plant and equipment (202) (546) $ (11)
Ending balance 54,700 41,747 41,418
Gross carrying amount [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 182,759 170,704  
Additions 16,696 3,406  
Disposals (6,848) (3,167)  
Transfer 28 64  
Exchange differences 3,172 11,944  
Ending balance 195,807 182,759 170,704
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
Gross carrying amount [Member] | IFRS 16 [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Effects on initial application of IFRS 16   (192)  
Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (141,012) (129,286)  
Depreciation charge for the year (4,575) (4,734)  
Impairment of property, plant and equipment (202) (546)  
Disposals 6,790 3,084  
Transfer (56) (64)  
Exchange differences (2,052) (9,592)  
Ending balance (141,107) (141,012) (129,286)
Accumulated depreciation and amortisation [member] | Adjusted Balance [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance   (129,160)  
Ending balance     (129,160)
Accumulated depreciation and amortisation [member] | IFRS 16 [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Effects on initial application of IFRS 16   126  
Land [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 6,838 6,206  
Ending balance 6,872 6,838 6,206
Land [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 6,838 6,206  
Exchange differences 34 632  
Ending balance 6,872 6,838 6,206
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 13,673 14,160  
Ending balance 13,631 13,673 14,160
Buildings [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 50,543 47,890  
Additions   7  
Transfer 680 (167)  
Exchange differences 893 2,813  
Ending balance 52,116 50,543 47,890
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 and amortisation [member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (36,870) (33,730)  
Depreciation charge for the year (962) (1,044)  
Transfer   265  
Exchange differences (653) (2,361)  
Ending balance (38,485) (36,870) (33,730)
Buildings [Member] | Accumulated depreciation and amortisation [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 2,566 2,148  
Ending balance 2,480 2,566 2,148
Building improvement [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 7,030 5,715  
Additions 138 119  
Disposals (31) (4)  
Transfer 152 746  
Exchange differences 47 454  
Ending balance 7,336 7,030 5,715
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 and amortisation [member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (4,464) (3,567)  
Depreciation charge for the year (384) (338)  
Impairment of property, plant and equipment   (1)  
Disposals 21 4  
Transfer   (265)  
Exchange differences (29) (297)  
Ending balance (4,856) (4,464) (3,567)
Building improvement [Member] | Accumulated depreciation and amortisation [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 13,737 13,770  
Ending balance 12,721 13,737 13,770
Machinery and equipment [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 103,869 96,718  
Additions 239 292  
Disposals (6,129) (2,308)  
Transfer 1,157 1,748  
Exchange differences 1,129 7,419  
Ending balance 100,265 103,869 96,718
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 and amortisation [member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (90,132) (82,948)  
Depreciation charge for the year (2,301) (2,391)  
Impairment of property, plant and equipment (198) (550)  
Disposals 6,128 2,274  
Exchange differences (1,041) (6,517)  
Ending balance (87,544) (90,132) (82,948)
Machinery and equipment [Member] | Accumulated depreciation and amortisation [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 [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 2,347 2,298  
Ending balance 2,112 2,347 2,298
Motor vehicle and other asset [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 6,009 5,780  
Additions 265 433  
Disposals (483) (524)  
Transfer 115 180  
Exchange differences 63 332  
Ending balance 5,969 6,009 5,780
Motor vehicle and other asset [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 [Member] | Gross carrying amount [Member] | 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 [Member] | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (3,662) (3,482)  
Depreciation charge for the year (514) (541)  
Impairment of property, plant and equipment   7  
Disposals 438 477  
Transfer (56) (64)  
Exchange differences (63) (185)  
Ending balance (3,857) (3,662) (3,482)
Motor vehicle and other asset [Member] | Accumulated depreciation and amortisation [member] | Adjusted Balance [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance   (3,356)  
Ending balance     (3,356)
Motor vehicle and other asset [Member] | Accumulated depreciation and amortisation [member] | IFRS 16 [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Effects on initial application of IFRS 16   126  
Office equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 1,208 1,163  
Ending balance 1,223 1,208 1,163
Office equipment [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 7,092 6,722  
Additions 363 315  
Disposals (205) (331)  
Transfer 17 139  
Exchange differences 321 247  
Ending balance 7,588 7,092 6,722
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 and amortisation [member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (5,884) (5,559)  
Depreciation charge for the year (414) (420)  
Impairment of property, plant and equipment (4) (2)  
Disposals 203 329  
Exchange differences (266) (232)  
Ending balance (6,365) (5,884) (5,559)
Office equipment [Member] | Accumulated depreciation and amortisation [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 1,378 1,673  
Ending balance 15,661 1,378 1,673
Construction in progress [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 1,378 1,673  
Additions 15,691 2,240  
Transfer (2,093) (2,582)  
Exchange differences 685 47  
Ending balance $ 15,661 1,378 1,673
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