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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

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