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RESEARCH AND DEVELOPMENT EXPENSES (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Research And Development Expenses Net [Line Items]      
Research and development expenses $ 16,491 $ 17,419 $ 24,862
Payroll and related expenses      
Research And Development Expenses Net [Line Items]      
Research and development expenses, gross 636 623 552
Professional services and consulting fees      
Research And Development Expenses Net [Line Items]      
Research and development expenses, gross 1,752 2,345 2,297
Share-based payments      
Research And Development Expenses Net [Line Items]      
Research and development expenses, gross 883 671 872
Clinical and pre-clinical trials      
Research And Development Expenses Net [Line Items]      
Research and development expenses, gross 12,569 12,840 20,373
Intellectual property development      
Research And Development Expenses Net [Line Items]      
Research and development expenses, gross 298 317 290
Other      
Research And Development Expenses Net [Line Items]      
Research and development expenses, gross $ 353 $ 623 $ 478