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STOCK-BASED COMPENSATION (Details)
3 Months Ended
Mar. 31, 2021
USD ($)
$ / shares
shares
Share-based Payment Arrangement [Abstract]  
Number of options outstanding, beginning | shares 3,931,586
Granted | shares 577,500
Exercised | shares (75,000)
Forfeited/cancelled/expired | shares (10,000)
Number of options outstanding, ending | shares 4,424,086
Number of options vested and exercisable | shares 2,116,917
Weighted average exercise price outstanding, beginning | $ / shares $ 4.41
Granted | $ / shares 5.28
Exercised | $ / shares 1.50
Forfeited/cancelled/expired | $ / shares 5.42
Weighted average exercise price outstanding, ending | $ / shares 4.57
Weighted average exercise price vested and exercisable | $ / shares $ 2.86
Weighted average remaining contractual term outstanding, beginning 4 years 9 months 18 days
Weighted average remaining contractual term outstanding, ending 5 years 4 months 20 days
Weighted average remaining contractual term vested and exercisable 2 years 5 months 26 days
Aggregate intrinsic value outstanding | $ $ 5,533,110
Aggregate intrinsic value vested and exercisable | $ $ 5,181,463