Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Retail Properties Held for Sale (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Retail Properties Held for Sale (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 5 Months Ended
Jul. 29, 2021
Jul. 09, 2021
Sep. 30, 2021
Jun. 30, 2021
Jun. 30, 2021
Jun. 30, 2021
Real Estate Properties [Line Items]            
Provision for impairment of investment properties       $ 750 $ 750 $ 750
San Diego, CA            
Real Estate Properties [Line Items]            
Carrying value       14,471 14,471 14,471
San Diego, CA | Subsequent Event            
Real Estate Properties [Line Items]            
Gross sales price   $ 14,750        
Lone Tree, CO            
Real Estate Properties [Line Items]            
Carrying value       6,251 6,251 6,251
Lone Tree, CO | Subsequent Event            
Real Estate Properties [Line Items]            
Gross sales price $ 7,000          
Frisco, TX            
Real Estate Properties [Line Items]            
Carrying value       9,894 9,894 9,894
Frisco, TX | Subsequent Event            
Real Estate Properties [Line Items]            
Gross sales price $ 10,500          
Carson, CA            
Real Estate Properties [Line Items]            
Carrying value       $ 15,362 $ 15,362 $ 15,362
Carson, CA | Forecast            
Real Estate Properties [Line Items]            
Gross sales price     $ 19,000