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Segment Information - Summary of Segment Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenues      
Revenue $ 338,160 $ 425,940 $ 425,215
Segment operating profit/(loss) (264) 9,324 12,440
Depreciation and amortization (5,324) (5,018) (5,056)
Depreciation from right of use assets (507)    
Impairment of property, plant and equipment (546) (11) (223)
Interest income 506 482 876
Interest expense (845) (1,200) (966)
Income tax (expense)/benefit (2,057) (3,886) (5,140)
Other disclosures      
Capital expenditure 5,462 4,508 4,913
Total assets 298,911 305,798  
Total liabilities 70,476 83,982  
North Asia (Segment) [Member]      
Revenues      
Revenue 76,575 103,647  
Thailand (Segment) [Member]      
Revenues      
Revenue 172,379 213,424  
ROW (Segment) [Member]      
Revenues      
Revenue 89,206 108,869  
Operating segments [Member]      
Revenues      
Segment operating profit/(loss) 2,620 12,467 15,514
Depreciation and amortization (5,266) (4,998) (5,053)
Depreciation from right of use assets (485)    
Impairment of property, plant and equipment (546) (11) (223)
Interest income 505 770 957
Interest expense (822) (1,179) (1,033)
Income tax (expense)/benefit (1,691) (2,980) (4,464)
Other disclosures      
Capital expenditure 5,384 4,498 4,913
Total assets 291,576 298,222  
Total liabilities 62,752 77,071  
Operating segments [Member] | North Asia (Segment) [Member]      
Revenues      
Segment operating profit/(loss) 1,237 5,234 3,256
Depreciation and amortization (811) (829) (979)
Depreciation from right of use assets (44)    
Impairment of property, plant and equipment (549)   (213)
Interest income 57 117 51
Interest expense (239) (397) (428)
Income tax (expense)/benefit (561) (1,212) (1,395)
Other disclosures      
Capital expenditure 552 1,188 991
Total assets 49,379 54,250  
Total liabilities 14,212 20,169  
Operating segments [Member] | Thailand (Segment) [Member]      
Revenues      
Segment operating profit/(loss) 3,042 9,539 11,053
Depreciation and amortization (2,842) (2,836) (2,760)
Impairment of property, plant and equipment 3 (11) (10)
Interest income 403 611 845
Interest expense (481) (748) (553)
Income tax (expense)/benefit (1,235) (2,152) (2,727)
Other disclosures      
Capital expenditure 4,590 2,859 3,332
Total assets 165,579 173,398  
Total liabilities 26,706 42,887  
Operating segments [Member] | ROW (Segment) [Member]      
Revenues      
Segment operating profit/(loss) (1,659) (2,306) 1,205
Depreciation and amortization (1,613) (1,333) (1,314)
Depreciation from right of use assets (441)    
Interest income 45 42 61
Interest expense (102) (34) (52)
Income tax (expense)/benefit 105 384 (342)
Other disclosures      
Capital expenditure 242 451 590
Total assets 76,618 70,574  
Total liabilities 21,834 14,015  
Corporate expense adjustments and eliminations [Member]      
Revenues      
Segment operating profit/(loss) (2,884) (3,143) (3,074)
Depreciation and amortization (58) (20) (3)
Depreciation from right of use assets (22)    
Interest income 1 (288) (81)
Interest expense (23) (21) 67
Income tax (expense)/benefit (366) (906) (676)
Other disclosures      
Capital expenditure 78 10  
Total assets 7,335 7,576  
Total liabilities 7,724 6,911  
External customers [Member]      
Revenues      
Revenue 338,160 425,940 425,215
External customers [Member] | Operating segments [Member]      
Revenues      
Revenue 338,160 425,940 425,215
External customers [Member] | Operating segments [Member] | North Asia (Segment) [Member]      
Revenues      
Revenue 76,575 103,647 101,533
External customers [Member] | Operating segments [Member] | Thailand (Segment) [Member]      
Revenues      
Revenue 172,379 213,424 206,485
External customers [Member] | Operating segments [Member] | ROW (Segment) [Member]      
Revenues      
Revenue 89,206 108,869 117,197
Intersegment [Member] | Operating segments [Member]      
Revenues      
Revenue 6 10,776 1,934
Intersegment [Member] | Operating segments [Member] | North Asia (Segment) [Member]      
Revenues      
Revenue   4,076 890
Intersegment [Member] | Operating segments [Member] | Thailand (Segment) [Member]      
Revenues      
Revenue 6 392 1,044
Intersegment [Member] | Operating segments [Member] | ROW (Segment) [Member]      
Revenues      
Revenue   6,308  
Intersegment [Member] | Corporate expense adjustments and eliminations [Member]      
Revenues      
Revenue $ (6) $ (10,776) $ (1,934)