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STOCKHOLDERS' EQUITY - Shares Issued Through the At-the-Market Equity Offering Program (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Shares Issued Through Equity Offering Program    
Number of shares sold (in shares) 180,120 126,300
Proceeds from Issuance of Common Stock $ 5,392,000 $ 3,245,000
Payment of commissions on sale of shares 54,000 33,000
Payment of Offering Costs on Sale of Shares $ 192,000 $ 107,000