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STOCKHOLDERS' EQUITY - Shares Issued through the At-the-Market Offering Program (Details) - At-the-Market Equity Offering Program - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Nov. 01, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
STOCKHOLDERS' EQUITY          
Number of shares sold 23,000 49,000 0 49,000 0
Proceeds from sale of common stock, net of commissions $ 717,000 $ 1,489,000   $ 1,489,000  
Payment of commissions on sale of shares $ 15,000 30,000   30,000  
Payment of offering costs on sale of shares   $ 65,000   $ 65,000