Summary of Significant Accounting Policies - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2020 USD ($) segment	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 06, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Summary of Significant Accounting Policies [Line Items]
Number of Reportable Segments | segment	3
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 179,825,618	$ 172,376,209	$ 145,417,938		$ 267,730	$ (267,003)	$ (117,657)
Percentage of taxable income distribute to qualify as real estate investment trust (REIT)	90.00%
Organization and offering expenses, term of reimbursement to Adviser	60 months
Organization and offering expenses incurred by Adviser and its affiliates on company's behalf	$ 5,100,000		5,100,000
Organization expenses payable				$ 900,000
Offering expenses payable				$ 4,200,000
Fair Value, Inputs, Level 2 [Member] | Commercial Mortgage Backed Securities [Member]
Summary of Significant Accounting Policies [Line Items]
Investments	$ 29,900,000
Building [Member] | Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Building [Member] | Minimum [Member]
Summary of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	30 years
Building and Building Improvements [Member] | Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Building and Building Improvements [Member] | Minimum [Member]
Summary of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Furniture, Fixtures, and Equipment [Member] | Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	7 years
Furniture, Fixtures, and Equipment [Member] | Minimum [Member]
Summary of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	1 year
Noncontrolling Interest [Member]
Summary of Significant Accounting Policies [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 5,862,169	$ 6,299,046	$ 5,348,012		$ 1,561,852