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RELATED PARTY BALANCES AND TRANSACTIONS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Related Party Transactions [Abstract]      
Trade payables and accrued expenses $ 83 $ 104  
Amounts charged to research and development expenses $ 294 $ 241 $ 314