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STOCKHOLDERS' EQUITY - Stock options (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
STOCKHOLDERS' EQUITY        
Number of Options, Grants 708,732 20,000 708,732  
Number of Options, Exercised   197,256 1,032,922  
Stock options        
STOCKHOLDERS' EQUITY        
Number of Options, Outstanding at Beginning of Year   4,019,000    
Number of Options, Grants   20,000    
Number of Options, Exercised   197,000    
Number of Option, Forfeited/cancelled/expired/settled   59,000    
Number of Options, Balance at End of Year   3,783,000   4,019,000
Number of Options, Vested and expected to vest   3,779,000    
Number of Options, Unvested   71,000    
Number of Options, Exercisable   3,712,000    
Weighted-Average Exercise Price, Outstanding at Beginning of Year (in dollars per share)   $ 2.11    
Weighted-Average Exercise Price, Grants (in dollars per share)   1.25    
Weighted-Average Exercise Price, Exercised (in dollars per share)   1.60    
Weighted-Average Exercise Price, Forfeited/cancelled/expired/settled (in dollars per share)   1.27    
Weighted-Average Exercise Price, Balance at End of Year (in dollars per share)   2.15   $ 2.11
Weighted-Average Exercise Price, Vested and expected to vest (in dollars per share)   2.15    
Weighted-Average Exercise Price, Unvested (in dollars per share)   1.13    
Weighted-Average Exercise Price, Exercisable (in dollars per share)   $ 2.17    
Weighted-Average Remaining Contractual Term, Outstanding (in years)   6 years 1 month 24 days   6 years 5 months 23 days
Weighted-Average Remaining Contractual Term, Grants (in years)   0 years    
Weighted-Average Remaining Contractual Term, Exercised (in years)   0 years    
Weighted-Average Remaining Contractual Term, Forfeited/cancelled/expired/settled (in years)   0 years    
Weighted-Average Remaining Contractual Term, Vested and expected to vest (in years)   6 years 1 month 24 days    
Weighted-Average Remaining Contractual Term, Unvested (in years)   9 years 3 months 3 days    
Weighted-Average Remaining Contractual Term, Exercisable (in years)   6 years 1 month 2 days    
Aggregate Intrinsic Value, Outstanding   $ 10,860,000   $ 41,000
Aggregate Intrinsic Value, Grants   0    
Aggregate Intrinsic Value, Exercised   0    
Aggregate Intrinsic Value, Forfeited/cancelled/expired/settled   0    
Aggregate Intrinsic Value, Vested and expected to vest   10,846,000    
Aggregate Intrinsic Value, Unvested   275,000    
Aggregate Intrinsic Value, Exercisable   $ 10,585,000