General form of registration statement for all companies including face-amount certificate companies

SHAREHOLDERS' EQUITY - Warrants (Details)

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SHAREHOLDERS' EQUITY - Warrants (Details) - shares
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Class of Warrant or Right [Line Items]      
Balance at Beginning of period (in shares) 3,665,006    
Convertible debt, warrants issued (Note 8) 275,000    
Balance at End of period (in shares) 3,940,006 3,665,006  
Warrants      
Class of Warrant or Right [Line Items]      
Balance at Beginning of period (in shares) 18,325,028 392,755 49,000
Warrants exercised     (44,600)
Warrants expired     (4,400)
Convertible debt, warrants issued (Note 8)   1,511,609 392,755
Equity financing, warrants issued (discussed above)   16,420,664  
Balance at End of period (in shares)   18,325,028 392,755