Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY AND CLASS A PREFERRED STOCK - Stock option activity (Details)

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STOCKHOLDERS' EQUITY AND CLASS A PREFERRED STOCK - Stock option activity (Details) - Stock Options - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Number of shares    
Outstanding options at December 31, 2020 2,142,000  
Exercised (10,000)  
Forfeited (22,666)  
Outstanding options at September 30, 2021 2,109,334 2,142,000
Options vested and exercisable at September 30, 2021 1,988,416  
Weighted average exercise price    
Outstanding options at December 31, 2020 $ 0.80  
Exercised 0.68  
Forfeited 1.37  
Outstanding options at September 30, 2021 0.79 $ 0.80
Options vested and exercisable at September 30, 2021 $ 0.75  
Total weighted average intrinsic value    
Outstanding options at December 31, 2020 $ 7,934,320  
Outstanding options at September 30, 2021 7,825,129 $ 7,934,320
Options vested and exercisable at September 30, 2021 $ 7,448,011  
Outstanding options, Weighted average remaining contractual life (years) 4 years 11 months 8 days 5 years 8 months 19 days
Options vested and exercisable at September 30, 2021 4 years 9 months 10 days