SUPPLEMENTAL CASH FLOW INFORMATION - Disclosure of Non-Cash Investing and Financing Activities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]
Interest paid	$ 7,810	$ 1,521	$ 84
Distributions payable	2,241	920	56
Distribution fees payable to affiliates	16,467	7,457	394
Distributions reinvested in common stock	9,482	1,959	53
Accrued offering and organization costs due to the Advisor	21,347	14,197	927
Accrued acquisition expense reimbursements due to the Advisor	182	3,500	0
Redeemable noncontrolling interest issued as settlement of performance component of the advisory fee	723	0	0
Non-cash selling commissions and dealer manager fees	11,697	8,802	203
Mortgage notes assumed on real estate acquisitions at fair value	$ 50,418	$ 0	$ 0