Nature of Business and Operations - Initial Offering Price (Details) - $ / shares	Jun. 30, 2019	Mar. 21, 2019	Jun. 27, 2018
Class of Stock [Line Items]
Net asset value		$ 9.12	$ 9.05
Class A | Primary Offering Price | Inception through July 2, 2017
Class of Stock [Line Items]
Primary Offering Price	$ 10.00
Class A | Shares issued through distribution reinvestment plan | Inception through July 2, 2017
Class of Stock [Line Items]
Primary Offering Price	9.60
Class A | Shares issued through distribution reinvestment plan | July 3, 2017 through July 1, 2018
Class of Stock [Line Items]
Primary Offering Price	9.60
Class A | Shares issued through distribution reinvestment plan | July 2, 2018 through March 24, 2019
Class of Stock [Line Items]
Primary Offering Price	9.05
Class A | Shares issued through distribution reinvestment plan | March 25, 2019 through March 31, 2019
Class of Stock [Line Items]
Primary Offering Price	9.12
Class T Common Stock | Primary Offering Price | Inception through July 2, 2017
Class of Stock [Line Items]
Primary Offering Price	9.47
Class T Common Stock | Shares issued through distribution reinvestment plan | Inception through July 2, 2017
Class of Stock [Line Items]
Primary Offering Price	9.09
Class T Common Stock | Shares issued through distribution reinvestment plan | July 3, 2017 through July 1, 2018
Class of Stock [Line Items]
Primary Offering Price	9.09
Class T Common Stock | Shares issued through distribution reinvestment plan | July 2, 2018 through March 24, 2019
Class of Stock [Line Items]
Primary Offering Price	9.05
Class T Common Stock | Shares issued through distribution reinvestment plan | March 25, 2019 through March 31, 2019
Class of Stock [Line Items]
Primary Offering Price	9.12
Class R Common Stock | Primary Offering Price | July 3, 2017 through July 1, 2018
Class of Stock [Line Items]
Primary Offering Price	9.52
Class R Common Stock | Primary Offering Price | July 2, 2018 through March 24, 2019
Class of Stock [Line Items]
Primary Offering Price	9.68
Class R Common Stock | Primary Offering Price | March 25, 2019 through March 31, 2019
Class of Stock [Line Items]
Primary Offering Price	9.75
Class R Common Stock | Shares issued through distribution reinvestment plan | July 3, 2017 through July 1, 2018
Class of Stock [Line Items]
Primary Offering Price	9.14
Class R Common Stock | Shares issued through distribution reinvestment plan | July 2, 2018 through March 24, 2019
Class of Stock [Line Items]
Primary Offering Price	9.05
Class R Common Stock | Shares issued through distribution reinvestment plan | March 25, 2019 through March 31, 2019
Class of Stock [Line Items]
Primary Offering Price	9.12
Class I Common Stock | Primary Offering Price | July 3, 2017 through July 1, 2018
Class of Stock [Line Items]
Primary Offering Price	9.13
Class I Common Stock | Primary Offering Price | July 2, 2018 through March 24, 2019
Class of Stock [Line Items]
Primary Offering Price	9.28
Class I Common Stock | Primary Offering Price | March 25, 2019 through March 31, 2019
Class of Stock [Line Items]
Primary Offering Price	9.35
Class I Common Stock | Shares issued through distribution reinvestment plan | July 3, 2017 through July 1, 2018
Class of Stock [Line Items]
Primary Offering Price	8.90
Class I Common Stock | Shares issued through distribution reinvestment plan | July 2, 2018 through March 24, 2019
Class of Stock [Line Items]
Primary Offering Price	9.05
Class I Common Stock | Shares issued through distribution reinvestment plan | March 25, 2019 through March 31, 2019
Class of Stock [Line Items]
Primary Offering Price	$ 9.12