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Employees and Employee-Related Costs - Employee Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of expenses by nature [line items]      
Wages and salaries $ 4,016 $ 2,819 $ 1,733
Share-based compensation expenses 3,408 2,362 2,069
Defined contribution plans 206 96 70
Other social security expenses 17 12 10
Other staff expenses 196 176 133
Total employee costs 7,843 5,465 4,015
Non-management employee benefit expense 4,620 3,258 1,712
Research and development      
Disclosure of expenses by nature [line items]      
Share-based compensation expenses 1,496 1,021 896
Total employee costs 4,833 3,607 2,652
Non-management employee benefit expense 4,009 2,590 1,686
General and administrative      
Disclosure of expenses by nature [line items]      
Share-based compensation expenses 1,912 1,341 1,173
Total employee costs 3,010 1,858 1,363
Non-management employee benefit expense $ 611 $ 668 $ 26