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Related-party Transactions- Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended 24 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
IFRS Statement [Line Items]        
Accounts payable to related parties $ 1,568 $ 0   $ 1,568
Miscellaneous purchases 92      
Research and development 122,265 114,859 $ 123,037  
Current payables to related parties 2,572 2,220   2,572
Key management Personnel Compensation Director       135
Research and Development [Member]        
IFRS Statement [Line Items]        
Research and development 1,400 1,800 $ 2,200  
VST [Member] | Research and Development [Member]        
IFRS Statement [Line Items]        
Research and development   $ 1,597    
Cheng Mei Materials Technology Corporation [Member]        
IFRS Statement [Line Items]        
Purchases of goods, related party transactions 663      
Accounts payable to related parties 1,530     1,530
Miscellaneous purchases 84      
Ningbo Cheng Mei Materials Technology Co. Ltd. [Member]        
IFRS Statement [Line Items]        
Purchases of goods, related party transactions 26      
Accounts payable to related parties $ 38     $ 38