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Segment Information - Summary of Segment Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues      
Revenue $ 313,564 $ 338,160 $ 425,940
Segment operating profit/(loss) 6,872 (264) 9,324
Depreciation and amortization(Included depreciation from right of use assets) (5,402) (5,324) (5,018)
Depreciation from right of use assets (621) (507)  
Impairment of property, plant and equipment (202) (546) (11)
Interest income 320 506 482
Interest expense (615) (845) (1,200)
Income tax (expense)/benefit (4,016) (2,057) (3,886)
Other disclosures      
Capital expenditure 14,604 5,462 4,508
Total assets 338,119 298,911  
Total liabilities 103,244 70,476  
North Asia (Segment) [Member]      
Revenues      
Revenue 73,199 76,575 103,647
Thailand (Segment) [Member]      
Revenues      
Revenue 143,647 172,379 213,424
ROW (Segment) [Member]      
Revenues      
Revenue 96,718 89,206 108,869
Operating segments [Member]      
Revenues      
Segment operating profit/(loss) 9,845 2,620 12,467
Depreciation and amortization(Included depreciation from right of use assets) (5,284) (5,266) (4,998)
Depreciation from right of use assets (550) (485)  
Impairment of property, plant and equipment (202) (546) (11)
Interest income 319 505 770
Interest expense (540) (822) (1,179)
Income tax (expense)/benefit (3,849) (1,691) (2,980)
Other disclosures      
Capital expenditure 14,604 5,384 4,498
Total assets 327,226 291,576  
Total liabilities 89,690 62,752  
Operating segments [Member] | North Asia (Segment) [Member]      
Revenues      
Segment operating profit/(loss) 3,087 1,237 5,234
Depreciation and amortization(Included depreciation from right of use assets) (796) (811) (829)
Depreciation from right of use assets (46) (44)  
Impairment of property, plant and equipment 0 (549) 0
Interest income 94 57 117
Interest expense (178) (239) (397)
Income tax (expense)/benefit (791) (561) (1,212)
Other disclosures      
Capital expenditure 3,763 552 1,188
Total assets 52,436 49,379  
Total liabilities 12,647 14,212  
Operating segments [Member] | Thailand (Segment) [Member]      
Revenues      
Segment operating profit/(loss) 11,250 3,042 9,539
Depreciation and amortization(Included depreciation from right of use assets) (2,773) (2,842) (2,836)
Depreciation from right of use assets 0 0  
Impairment of property, plant and equipment (4) 3 (11)
Interest income 192 403 611
Interest expense (105) (481) (748)
Income tax (expense)/benefit (2,344) (1,235) (2,152)
Other disclosures      
Capital expenditure 10,674 4,590 2,859
Total assets 173,967 165,579  
Total liabilities 29,911 26,706  
Operating segments [Member] | ROW (Segment) [Member]      
Revenues      
Segment operating profit/(loss) (4,492) (1,659) (2,306)
Depreciation and amortization(Included depreciation from right of use assets) (1,715) (1,613) (1,333)
Depreciation from right of use assets (504) (441)  
Impairment of property, plant and equipment (198) 0 0
Interest income 33 45 42
Interest expense (257) (102) (34)
Income tax (expense)/benefit (714) 105 384
Other disclosures      
Capital expenditure 167 242 451
Total assets 100,823 76,618  
Total liabilities 47,132 21,834  
Corporate expense adjustments and eliminations [Member]      
Revenues      
Segment operating profit/(loss) (2,973) (2,884) (3,143)
Depreciation and amortization(Included depreciation from right of use assets) (118) (58) (20)
Depreciation from right of use assets (71) (22)  
Impairment of property, plant and equipment 0 0 0
Interest income 1 1 (288)
Interest expense (75) (23) (21)
Income tax (expense)/benefit (167) (366) (906)
Other disclosures      
Capital expenditure 0 78 10
Total assets 10,893 7,335  
Total liabilities 13,554 7,724  
External customers [Member]      
Revenues      
Revenue 313,564 338,160 425,940
External customers [Member] | Operating segments [Member]      
Revenues      
Revenue 313,564 338,160 425,940
External customers [Member] | Operating segments [Member] | North Asia (Segment) [Member]      
Revenues      
Revenue 73,199 76,575 103,647
External customers [Member] | Operating segments [Member] | Thailand (Segment) [Member]      
Revenues      
Revenue 143,647 172,379 213,424
External customers [Member] | Operating segments [Member] | ROW (Segment) [Member]      
Revenues      
Revenue 96,718 89,206 108,869
External customers [Member] | Corporate expense adjustments and eliminations [Member]      
Revenues      
Revenue 0 0 0
Intersegment [Member]      
Revenues      
Revenue 0 0 0
Intersegment [Member] | Operating segments [Member]      
Revenues      
Revenue 0 6 10,776
Intersegment [Member] | Operating segments [Member] | North Asia (Segment) [Member]      
Revenues      
Revenue 0 0 4,076
Intersegment [Member] | Operating segments [Member] | Thailand (Segment) [Member]      
Revenues      
Revenue 0 6 392
Intersegment [Member] | Operating segments [Member] | ROW (Segment) [Member]      
Revenues      
Revenue 0 0 6,308
Intersegment [Member] | Corporate expense adjustments and eliminations [Member]      
Revenues      
Revenue $ 0 $ (6) $ (10,776)