SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2020 USD ($) segment $ / shares shares	Jun. 30, 2019 USD ($) $ / shares shares	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Accounting Policies [Abstract]
Redeemable common stock payable	$ 621		$ 621			$ 2,218
Number of reportable segments | segment			1
Potentially dilutive securities | shares	0	0	0	0
Summary of Significant Accounting Policies [Line Items]
Stock redeemed during period	$ 10	$ 239	$ 1,730	$ 2,733
Class A
Summary of Significant Accounting Policies [Line Items]
Distributions declared per common share (in dollars per share) | $ / shares	$ 0	$ 0.02397501	$ 0	$ 0.0639334
Class T
Summary of Significant Accounting Policies [Line Items]
Distributions declared per common share (in dollars per share) | $ / shares	$ 0	$ 0.02397501	$ 0	$ 0.0639334
Forecast
Summary of Significant Accounting Policies [Line Items]
Remaining authorized repurchase amount					$ 500
Common Stock
Summary of Significant Accounting Policies [Line Items]
Stock redeemed during period			$ 1,700
Number of shares non-redeemable do to limitation (in shares) | shares			1,037,033
Number of shares non-redeemable do to limitation			$ 10,500
Common Stock | Class A
Summary of Significant Accounting Policies [Line Items]
Stock redeemed during period		$ 1	$ 1	$ 3