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Segment Information - Summary of Application of IFRS 16 Increased the Segment Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Operating Segments [Line Items]    
Assets $ 338,119 $ 298,911
Liabilities 103,244 70,476
Increase due to application of IFRS 16 [member]    
Disclosure Of Operating Segments [Line Items]    
Assets   2,698
Liabilities   2,757
Operating segments [Member]    
Disclosure Of Operating Segments [Line Items]    
Assets 327,226 291,576
Liabilities 89,690 62,752
Operating segments [Member] | Increase due to application of IFRS 16 [member]    
Disclosure Of Operating Segments [Line Items]    
Assets   2,506
Liabilities   2,552
Operating segments [Member] | North Asia (Segment) [Member]    
Disclosure Of Operating Segments [Line Items]    
Assets 52,436 49,379
Liabilities 12,647 14,212
Operating segments [Member] | Thailand (Segment) [Member]    
Disclosure Of Operating Segments [Line Items]    
Assets 173,967 165,579
Liabilities 29,911 26,706
Operating segments [Member] | ROW (Segment) [Member]    
Disclosure Of Operating Segments [Line Items]    
Assets 100,823 76,618
Liabilities 47,132 21,834
Operating segments [Member] | ROW (Segment) [Member] | Increase due to application of IFRS 16 [member]    
Disclosure Of Operating Segments [Line Items]    
Assets   2,506
Liabilities   2,552
Corporate expense adjustments and eliminations [Member]    
Disclosure Of Operating Segments [Line Items]    
Assets 10,893 7,335
Liabilities $ 13,554 7,724
Corporate expense adjustments and eliminations [Member] | Increase due to application of IFRS 16 [member]    
Disclosure Of Operating Segments [Line Items]    
Assets   192
Liabilities   $ 205