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REDEEMABLE CONVERTIBLE PREFERRED STOCK AND COMMON STOCK (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
vote
$ / shares
shares
Sep. 30, 2020
shares
Sep. 30, 2021
USD ($)
vote
$ / shares
shares
Sep. 30, 2020
USD ($)
shares
Equity [Abstract]        
Temporary equity, original issue price (in dollars per share) | $ / shares $ 1.29   $ 1.29  
Dividends, temporary equity     $ 0 $ 0
Temporary equity, liquidation event, distribution of assets, original issue price multiplier 250.00%   250.00%  
Temporary equity, mandatory conversion, common stock sale cash proceeds minimum     $ 25,000,000  
Temporary equity, mandatory conversion, common stock sale, minimum valuation     $ 100,000,000  
Number of votes per common share | vote 1   1  
Sale of stock, number of shares issued in transaction (in shares) | shares     1,250,000  
Sale of stock, consideration received on transaction     $ 5,400,000  
Stock repurchased during period (in shares) | shares 0 0 0 0