RELATED PARTY TRANSACTIONS - Costs (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		5 Months Ended	6 Months Ended
	Jan. 31, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Related Party Transaction [Line Items]
Payable as of		$ 41		$ 41	$ 41		$ 59
Administrative fees		107	$ 52		165	$ 115
Advisor and Dealer Manager
Related Party Transaction [Line Items]
Expenses		2,491	3,988		7,488	6,725
Payable as of		41		41	41		59
Advisor and Dealer Manager | Asset management fees
Related Party Transaction [Line Items]
Expenses	$ 800	1,660	2,581	2,700	3,499	5,238
Payable as of		0		0	0		0
Advisor and Dealer Manager | Reimbursement of operating expenses
Related Party Transaction [Line Items]
Expenses	$ 31	146	73	191	222	153
Payable as of		41		41	41		59
Advisor and Dealer Manager | Disposition fees
Related Party Transaction [Line Items]
Expenses		685	$ 1,334		3,767	$ 1,334
Payable as of		$ 0		$ 0	$ 0		$ 0