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STOCKHOLDERS' EQUITY - Stock options (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
STOCKHOLDERS' EQUITY          
Number of Options, Grants 0 653,210 708,732 653,210  
Number of Options, Exercised       15,000  
Stock options [Member]          
STOCKHOLDERS' EQUITY          
Number of Options, Outstanding at Beginning of Year     4,197,000    
Number of Options, Grants     709,000    
Number of Options, Exercised     1,033,000    
Number of Option, Forfeited/cancelled/expired/settled     24,000    
Number of Options, Balance at End of Year 3,849,000   3,849,000   4,197,000
Number of Options, Vested and expected to vest 3,815,000   3,815,000    
Number of Options, Unvested 726,000   726,000    
Number of Options, Exercisable 3,123,000   3,123,000    
Weighted-Average Exercise Price, Outstanding at Beginning of Year (in dollars per share)     $ 2.13    
Weighted-Average Exercise Price, Grants (in dollars per share)     2.00    
Weighted-Average Exercise Price, Exercised (in dollars per share)     1.91    
Weighted-Average Exercise Price, Forfeited/cancelled/expired/settled (in dollars per share)     3.17    
Weighted-Average Exercise Price, Balance at End of Year (in dollars per share) $ 2.16   2.16   $ 2.13
Weighted-Average Exercise Price, Vested and expected to vest (in dollars per share) 2.12   2.12    
Weighted-Average Exercise Price, Unvested (in dollars per share) 2.00   2.00    
Weighted-Average Exercise Price, Exercisable (in dollars per share) $ 2.19   $ 2.19    
Weighted-Average Remaining Contractual Term, Outstanding (in years)     6 years 7 months 2 days   6 years 8 months 12 days
Weighted-Average Remaining Contractual Term, Vested and expected to vest (in years)     6 years 6 months 22 days    
Weighted-Average Remaining Contractual Term, Unvested (in years)     9 years 7 months 10 days    
Weighted-Average Remaining Contractual Term, Exercisable (in years)     5 years 10 months 21 days    
Aggregate Intrinsic Value, Outstanding $ 34,000   $ 34,000   $ 255,000
Aggregate Intrinsic Value, Vested and expected to vest 34,000   34,000    
Aggregate Intrinsic Value, Unvested 0   0    
Aggregate Intrinsic Value, Exercisable $ 34,000   $ 34,000