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Financial Assets and Financial Liabilities - Summary of Interest-bearing Loans and Borrowings (Detail)
฿ in Thousands, ¥ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2020
THB (฿)
Dec. 31, 2020
AUD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
SGD ($)
Dec. 31, 2019
THB (฿)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
SGD ($)
Disclosure of detailed information about borrowings [Line Items]                  
Interest-bearing loans and borrowings, Amount $ 13,781 $ 11,356              
Australia Dollars[Member]                  
Disclosure of detailed information about borrowings [Line Items]                  
Interest-bearing loans and borrowings, Interest rate 3.07%   3.07% 3.07% 3.07% 3.07%      
Interest-bearing loans and borrowings, Maturity Mar. 2045                
Interest-bearing loans and borrowings, Amount $ 3,764     $ 4,883          
Renminbi (RMB) [Member]                  
Disclosure of detailed information about borrowings [Line Items]                  
Interest-bearing loans and borrowings, Maturity Jun. 2021 Mar. 2020 ~ Sept. 2020              
Interest-bearing loans and borrowings, Amount $ 2,736 $ 2,929     ¥ 17,800     ¥ 20,400  
Renminbi (RMB) [Member] | Bottom of range [Member]                  
Disclosure of detailed information about borrowings [Line Items]                  
Interest-bearing loans and borrowings, Interest rate 4.50% 5.00% 4.50% 4.50% 4.50% 4.50% 5.00% 5.00% 5.00%
Renminbi (RMB) [Member] | Top Of Range [Member]                  
Disclosure of detailed information about borrowings [Line Items]                  
Interest-bearing loans and borrowings, Interest rate 4.90% 5.50% 4.90% 4.90% 4.90% 4.90% 5.50% 5.50% 5.50%
Thai Baht (THB) [Member]                  
Disclosure of detailed information about borrowings [Line Items]                  
Interest-bearing loans and borrowings, Maturity Mar. 2021 Jan. 2020 ~ Jun. 2020              
Interest-bearing loans and borrowings, Amount $ 2,488 $ 5,423 ฿ 74,176       ฿ 161,018    
Thai Baht (THB) [Member] | Bottom of range [Member]                  
Disclosure of detailed information about borrowings [Line Items]                  
Interest-bearing loans and borrowings, Interest rate 0.90% 1.90% 0.90% 0.90% 0.90% 0.90% 1.90% 1.90% 1.90%
Thai Baht (THB) [Member] | Top Of Range [Member]                  
Disclosure of detailed information about borrowings [Line Items]                  
Interest-bearing loans and borrowings, Interest rate 1.00% 2.70% 1.00% 1.00% 1.00% 1.00% 2.70% 2.70% 2.70%
Singapore dollars (SGD) [Member]                  
Disclosure of detailed information about borrowings [Line Items]                  
Interest-bearing loans and borrowings, Interest rate 2.32% 3.05% 2.32% 2.32% 2.32% 2.32% 3.05% 3.05% 3.05%
Interest-bearing loans and borrowings, Maturity Apr. 2021 Feb. 2020 ~ Apr. 2020              
Interest-bearing loans and borrowings, Amount $ 4,793 $ 3,004       $ 6,332     $ 4,042