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SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Sep. 20, 2018
Dec. 18, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2013
Average interest rate, short-term bank deposits in U.S. dollars     1.01% 2.37%    
Amortization in R&D expenses     $ 829 $ 627 $ 29  
Revenue recognition under milestone method $ 7,800 $ 2,000        
Severance expenses     572 366 556  
Net gain on derivative transactions     0 0 20  
Unrealized gain (loss) arising from derivative contracts     0 $ 0 $ 17  
Investment amount     12,000      
Upfront payment received     10,000     $ 10,000
Potential milestone compensation     200,000     $ 250,000
Accrued milestone payment     2,000      
Deferred participation of BMS in R&D expenses     $ 4,121      
Options [Member]            
Weighted average number of shares related to outstanding options excluded from the calculations of diluted net loss per share     7,150,648 12,754,803 11,035,644