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SHARE-BASED PAYMENTS - Number of Options and Weighted Averages of Exercise Prices (Details)
 12 Months Ended
Dec. 31, 2020
Option
$ / shares
Dec. 31, 2020
Option
$ / shares
Dec. 31, 2020
Option
USD ($)
$ / shares
Dec. 31, 2019
Option
$ / shares
Dec. 31, 2019
Option
$ / shares
Dec. 31, 2019
Option
USD ($)
$ / shares
SHARE-BASED PAYMENTS            
Number of options, outstanding at beginning of year | Option 4,050,898     2,936,024    
Number of options, exercised | Option (8,156)     (875)    
Number of options, expired and forfeited | Option (264,939)     (69,250)    
Number of options, granted 1,651,000   1,651,000 1,185,000   1,185,000
Number of options, outstanding at end of year | Option 5,428,803     4,050,898    
Number of options, exercisable at end of year | Option 3,178,317 3,178,317 3,178,317 2,490,292 2,490,292 2,490,292
Weighted average of exercise price, outstanding at beginning of year   $ 10.30     $ 10.50  
Weighted average of exercise price, exercised   6.38     6.10  
Weighted average of exercise price, expired and forfeited   9.65     10.30  
Weighted average of exercise price, granted   6.90     8.70  
Weighted average of exercise price, outstanding at end of year   9.08     10.30  
Weighted average of exercise price, exercisable at end of year $ 10.19 $ 10.19 $ 10.19 $ 11.40 $ 11.40 $ 11.40