RELATED PARTY TRANSACTIONS - Costs (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		8 Months Ended	9 Months Ended
	Jan. 31, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Related Party Transaction [Line Items]
Payable as of		$ 35		$ 35	$ 35		$ 59
Administrative fees		70	$ 55		235	$ 170
Advisor and Dealer Manager
Related Party Transaction [Line Items]
Expenses		2,047	2,538		9,535	9,263
Payable as of		35		35	35		59
Advisor and Dealer Manager | Asset management fees
Related Party Transaction [Line Items]
Expenses	$ 800	1,577	2,469	4,300	5,076	7,707
Payable as of		0		0	0		0
Advisor and Dealer Manager | Reimbursement of operating expenses
Related Party Transaction [Line Items]
Expenses	$ 31	89	69	280	311	222
Payable as of		35		35	35		59
Advisor and Dealer Manager | Disposition fees
Related Party Transaction [Line Items]
Expenses		381	$ 0		4,148	$ 1,334
Payable as of		$ 0		$ 0	$ 0		$ 0