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Operating Activities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of expenses by nature [line items]      
Share-based compensation expenses $ (3,408) $ (2,362) $ (2,069)
Recognized government grants as a reduction of research and development expenses 800 500 600
Research and development      
Disclosure of expenses by nature [line items]      
Employee salary and benefit expenses, excluding share-based compensation (3,337) (2,586) (1,756)
Share-based compensation expenses (1,496) (1,021) (896)
Depreciation (92) (65) (59)
External expenses (5,977) (4,544) (1,018)
Total (10,902) (8,216) (3,729)
General and administrative      
Disclosure of expenses by nature [line items]      
Employee salary and benefit expenses, excluding share-based compensation (1,098) (517) (190)
Share-based compensation expenses (1,912) (1,341) (1,173)
Professional fees (2,644) (773) (520)
Depreciation (12) (16) (15)
Total $ (5,666) $ (2,647) $ (1,898)