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SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)
$ in Thousands
 12 Months Ended
Sep. 20, 2018
USD ($)
Dec. 31, 2019
USD ($)
item
shares
Dec. 31, 2018
USD ($)
item
shares
Dec. 31, 2017
USD ($)
item
shares
Dec. 31, 2013
USD ($)
Average interest rate, short-term bank deposits in U.S. dollars   2.37% 2.35%    
Amortization in R&D expenses   $ 627 $ 29    
Number of licensed programs to achieve substantive milestones revenues | item   1  
Revenue recognition under milestone method $ 7,800  
Severance expenses   366 556 365  
Net gain on derivative transactions   0 20 422  
Unrealized gain (loss) arising from derivative contracts   $ 17  
Investment amount   12,000      
Derivative, notional amount      
Upfront payment received   10,000     $ 10,000
Potential milestone compensation   200,000     $ 250,000
Deferred participation of BMS in R&D expenses   4,121      
Right-of-use leased assets and liabilities   $ 5,049      
Options [Member]          
Weighted average number of shares related to outstanding options excluded from the calculations of diluted net loss per share | shares   12,754,803 11,035,644 8,774,219