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DEBT OBLIGATIONS - Credit Facility (Details) - USD ($)
12 Months Ended
Apr. 18, 2019
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Deferred mortgage costs   $ 880,000 $ 1,160,000
Line of Credit | Valley National Bank | Credit Facility, Maturing April 2021 | Secured debt      
Debt Instrument [Line Items]      
Debt face amount $ 10,000,000    
Effective interest rate   4.25%  
Commitment fee percentage   0.25%  
Interest expense, debt   $ 96,000 204,000
Deferred mortgage costs   $ 12,000 $ 53,000
Line of Credit | Valley National Bank | Credit Facility, Maturing April 2021 | Secured debt | Prime Rate      
Debt Instrument [Line Items]      
Margin interest above reference rate (as a percent) 0.50%    
Line of Credit | Valley National Bank | Credit Facility, Maturing April 2021 | Secured debt | Base Rate      
Debt Instrument [Line Items]      
Margin interest above reference rate (as a percent) 4.25%