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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)

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