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OTHER LONG-TERM LIABILITIES- Additional information (Details)
 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
installment
Dec. 31, 2020
shares
OTHER LONG-TERM LIABILITIES    
Net present value | $ $ 2,107,212  
Number of annual installment payments | installment 3  
Purchase price is payable | $ $ 1,101,110  
Series IV Preferred Stock    
OTHER LONG-TERM LIABILITIES    
Preferred shareholders as a result of private stock purchases | shares   320,333
Series V Preferred Stock    
OTHER LONG-TERM LIABILITIES    
Preferred shareholders as a result of private stock purchases | shares   25,000