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SHAREHOLDERS' EQUITY - Summary of warrants issued to non-employees (Details)
 12 Months Ended
Dec. 31, 2019
$ / shares
shares
SHAREHOLDERS' EQUITY  
Number of shares, Warrants outstanding at beginning and end of year | shares 5,000
Number of shares, Warrants exercised | shares (5,000)
Weighted average exercised price, Warrants outstanding $ 5.00
Weighted average exercise price, Warrants outstanding at beginning of year 5.00
Weighted average exercise price, Warrants exercisable at end of year $ 0.00