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Segment Information - Summary of Segment Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sales of goods / services      
Sales of goods / services $ 425,215 $ 384,565 $ 389,632
Gross profit 39,688 31,608 23,489
Depreciation and amortization (5,056) (5,554) (5,693)
Impairment of property, plant and equipment (223) (2,524) 0
Interest income 876 1,045 697
Interest expense (966) (962) (1,304)
Income tax (expense)/benefit (5,140) (510) (466)
Other disclosures      
Capital expenditure 4,913 5,170 7,444
Total assets 334,843 293,596  
Total liabilities 112,017 96,421  
Operating segments [Member]      
Sales of goods / services      
Gross profit 39,688 31,608 23,489
Depreciation and amortization (5,053) (5,551) (5,690)
Impairment of property, plant and equipment (223) (2,524)  
Interest income 957 1,153 713
Interest expense (1,033) (1,060) (1,311)
Income tax (expense)/benefit (4,464) 247 (264)
Other disclosures      
Capital expenditure 4,913 5,170 7,430
Total assets 330,923 290,994  
Total liabilities 106,452 92,770  
Operating segments [Member] | North Asia (Segment) [Member]      
Sales of goods / services      
Gross profit 7,471 5,033 1,888
Depreciation and amortization (979) (1,423) (1,511)
Impairment of property, plant and equipment (213) (1,132)  
Interest income 51 34 15
Interest expense (428) (692) (804)
Income tax (expense)/benefit (1,395) 2,844 614
Other disclosures      
Capital expenditure 991 697 594
Total assets 63,853 59,120  
Total liabilities 28,928 31,406  
Operating segments [Member] | Thailand (Segment) [Member]      
Sales of goods / services      
Gross profit 20,174 13,421 9,488
Depreciation and amortization (2,760) (2,689) (2,699)
Impairment of property, plant and equipment (10) (1,392)  
Interest income 845 1,022 621
Interest expense (553) (282) (467)
Income tax (expense)/benefit (2,727) (2,059) (655)
Other disclosures      
Capital expenditure 3,332 4,198 6,409
Total assets 181,232 145,549  
Total liabilities 55,877 36,929  
Operating segments [Member] | Rest of the World (Segment) [Member]      
Sales of goods / services      
Gross profit 12,043 13,154 12,113
Depreciation and amortization (1,314) (1,439) (1,480)
Interest income 61 97 77
Interest expense (52) (86) (40)
Income tax (expense)/benefit (342) (538) (223)
Other disclosures      
Capital expenditure 590 275 427
Total assets 85,838 86,325  
Total liabilities 21,647 24,435  
Corporate adjustments and Eliminations [Member]      
Sales of goods / services      
Depreciation and amortization (3) (3) (3)
Interest income (81) (108) (16)
Interest expense 67 98 7
Income tax (expense)/benefit (676) (757) (202)
Other disclosures      
Capital expenditure     14
Total assets 3,920 2,602  
Total liabilities 5,565 3,651  
External customers [Member]      
Sales of goods / services      
Sales of goods / services 425,215 384,565 389,632
External customers [Member] | Operating segments [Member]      
Sales of goods / services      
Sales of goods / services 425,215 384,565 389,632
External customers [Member] | Operating segments [Member] | North Asia (Segment) [Member]      
Sales of goods / services      
Sales of goods / services 101,533 93,931 90,237
External customers [Member] | Operating segments [Member] | Thailand (Segment) [Member]      
Sales of goods / services      
Sales of goods / services 206,485 152,935 165,354
External customers [Member] | Operating segments [Member] | Rest of the World (Segment) [Member]      
Sales of goods / services      
Sales of goods / services 117,197 137,699 134,041
Intersegment [Member] | Operating segments [Member]      
Sales of goods / services      
Sales of goods / services 1,934 2,481 3,883
Intersegment [Member] | Operating segments [Member] | North Asia (Segment) [Member]      
Sales of goods / services      
Sales of goods / services 890 2,522 2,381
Intersegment [Member] | Operating segments [Member] | Thailand (Segment) [Member]      
Sales of goods / services      
Sales of goods / services 1,044 (41) 1,502
Intersegment [Member] | Corporate adjustments and Eliminations [Member]      
Sales of goods / services      
Sales of goods / services $ (1,934) $ (2,481) $ (3,883)