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SHAREHOLDERS' EQUITY (Tables)
12 Months Ended
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Stock-Based Compensation Expenses
The stock-based compensation expenses are included as follows in the expense categories:

   
Year ended December 31,
 
   
2019
   
2018
   
2017
 
                   
Research and development expenses
 
$
1,151
   
$
948
   
$
1,331
 
Marketing and business development expenses
   
46
     
215
     
187
 
General and administrative expenses
   
1,211
     
1,003
     
1,115
 
                         
   
$
2,408
   
$
2,166
   
$
2,633
 
Employees and Directors [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule Of Option Activity
Transactions related to the grant of options to employees and directors under the above plans during the year ended December 31, 2019, were as follows:

   
Number of options
   
Weighted average exercise
price
   
Weighted average remaining contractual life
   
Aggregate intrinsic
value
 
          $
   
Years
    $
 
                             
Options outstanding at beginning of year
   
8,202,438
     
4.69
     
5.97
     
-
 
Options granted
   
1,513,000
     
3.46
                 
Options exercised
   
(878,378
)
   
3.70
                 
Options forfeited
   
(1,609,382
)
   
5.08
                 
Options expired
   
(3,333
)
   
2.46
                 
                                 
Options outstanding at end of year
   
7,224,345
     
4.47
     
5.95
     
12,816
 
                                 
Exercisable at end of year
   
4,165,052
     
5.24
     
4.12
     
4,961
Non-employees [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule Of Option Activity
   
Number of options
   
Weighted average exercise
price
   
Weighted average remaining contractual life
   
Aggregate intrinsic
value
 
         
$
   
Years
   
$
 
                             
Options outstanding at beginning of year
   
768,000
     
5.57
     
3.65
     
-
 
Options granted
   
280,000
     
3.83
                 
Options exercised
   
-
     
-
                 
Options forfeited
   
(130,000
)
   
5.87
                 
Options expired
   
(40,000
)
   
6.38
                 
                                 
Options outstanding at end of year
   
878,000
     
4.93
     
3.32
     
1,126
 
                                 
Exercisable at end of year
   
430,500
     
6.06
     
1.68
     
165
 
Schedule Of weighted-average assumptions for general options granted
The Company used the following weighted-average assumptions for general options granted to non-employees:

   
Year ended December 31,
 
   
2019
   
2018
   
2017
 
                   
Volatility
   
56.20
%
   
55.15
%
   
52.09
%
Risk-free interest rate
   
1.71
%
   
2.54
%
   
2.21
%
Dividend yield
   
0
%
   
0
%
   
0
%
Expected life (years)
   
6.00
     
5.85
     
5.23