ORGANIZATION AND BUSINESS (Details) $ / shares in Units, ft² in Thousands		9 Months Ended
	Aug. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2020 USD ($) ft² state property class_of_stock $ / shares	Aug. 14, 2020 $ / shares	Jun. 30, 2020 $ / shares	Dec. 31, 2019 USD ($) $ / shares	Apr. 30, 2019 USD ($)	Mar. 28, 2019 USD ($)	Sep. 22, 2016 USD ($) class_of_stock $ / shares
Class of Stock [Line Items]
Number of real estate properties | property		2
Net rentable area (in square feet) | ft²		391
Number of states in which real estate properties are owned | state		2
Percentage of rentable space leased		100.00%
Classes of common stock | class_of_stock		2
Common stock, shares issued						$ 31,200,000
Unsold shares deregistered						3,500,000,000
Class A Common Stock
Class of Stock [Line Items]
Common stock, shares issued		$ 25,093			$ 24,974
Net asset value (in dollars per share) | $ / shares				$ 7.76
Common stock, par value (in dollars per share) | $ / shares		$ 0.01			$ 0.01
Class T Common Stock
Class of Stock [Line Items]
Common stock, shares issued		$ 7,095			$ 7,229
Net asset value (in dollars per share) | $ / shares				$ 7.76
Common stock, par value (in dollars per share) | $ / shares		$ 0.01			$ 0.01
IPO
Class of Stock [Line Items]
Common stock, shares authorized, value (up to)								$ 3,500,000,000.0
Multi-Class Offering, Primary Offering
Class of Stock [Line Items]
Common stock, shares authorized, value (up to)								$ 2,500,000,000.0
Classes of common stock | class_of_stock								2
Common stock, shares issued						30,200,000
Multi-Class Offering, Primary Offering | Class A Common Stock
Class of Stock [Line Items]
Common stock, shares authorized, value (up to)								$ 1,250,000,000.00
Share price (in dollars per share) | $ / shares								$ 10.00
Common stock, shares issued						23,300,000
Multi-Class Offering, Primary Offering | Class T Common Stock
Class of Stock [Line Items]
Common stock, shares authorized, value (up to)								$ 1,250,000,000.00
Share price (in dollars per share) | $ / shares								$ 9.57
Common stock, shares issued						6,900,000
Distribution Reinvestment Plan
Class of Stock [Line Items]
Common stock, shares authorized, value (up to)							$ 4,300,000	$ 1,000,000,000.00
Share price (in dollars per share) | $ / shares								$ 9.10
Common stock, shares issued						1,000,000
Distribution Reinvestment Plan | Class A Common Stock
Class of Stock [Line Items]
Common stock, shares issued						655,000
Distribution Reinvestment Plan | Class T Common Stock
Class of Stock [Line Items]
Common stock, shares issued						$ 350,000
CCC III OP
Class of Stock [Line Items]
General partner partnership interest percentage		100.00%
Common Stock | Distribution Reinvestment Plan | Class A Common Stock
Class of Stock [Line Items]
Share price (in dollars per share) | $ / shares			$ 7.76
Common Stock | Distribution Reinvestment Plan | Class T Common Stock
Class of Stock [Line Items]
Share price (in dollars per share) | $ / shares			$ 7.76
CMFT
Class of Stock [Line Items]
Termination period	12 months
Percent of equity or assets acquired	50.00%
Percent of company equity	50.00%
Termination fee	$ 710,000
Expense reimbursement (up to)	$ 130,000
Common Stock | CMFT
Class of Stock [Line Items]
Common stock, par value (in dollars per share) | $ / shares	$ 0.01
Common stock, shares issued (in shares) | shares	1.098