Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies and General Information [Line Items]
Deferred rent receivable	$ 1,512,721		$ 1,512,721		$ 1,225,863
Impairment losses	0	$ 0	0	$ 0
Deferred financing costs, net	803,302		803,302		841,615
Accumulated amortization	119,494		119,494		81,181
Amortization of deferred financing costs	19,158	14,692	38,313	25,552
Stock subscriptions receivable	0		0		261,038
Due from related party	310,255		310,255		49,910
Deferred revenue	473,395		473,395		561,056
Restricted reserves	380,745		380,745		33,124
Tenant reimbursement income	456,666	219,082	877,825	594,995
Property operating expenses	545,230	$ 219,082	978,194	$ 594,995
Due to related parties	$ 1,861,062		$ 1,861,062		$ 2,057,181	$ 2,742,581
Percentage of organization and offering costs to gross offering proceeds			1.00%		1.00%
Initial O&O Costs incurred by advisor on behalf of Company			$ 9,907,863		$ 8,613,586
Net income (loss) per common share - basic and diluted	$ 0.07	$ 0.05	$ 0.16	$ 0.06
Accounting Standards Update 2016-02 [Member]
Accounting Policies and General Information [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true		true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 01, 2019		Jan. 01, 2019
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]	true		true
Change in Accounting Principle, Accounting Standards Update, Early Adoption [true false]	true		true
Accounting Standards Update 2018-13 [Member]
Accounting Policies and General Information [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true		true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 01, 2020		Jan. 01, 2020
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]	true		true
Change in Accounting Principle, Accounting Standards Update, Early Adoption [true false]	true		true
Accounting Standards Update 2018-17 [Member]
Accounting Policies and General Information [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true		true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 01, 2020		Jan. 01, 2020
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]	true		true
Advisor [Member]
Accounting Policies and General Information [Line Items]
Period of reimbursing the advisor for payment of organization and offering costs.			May 18, 2021
Advisor [Member] | Primary Offering [Member]
Accounting Policies and General Information [Line Items]
Period of reimbursing the advisor for payment of organization and offering costs.			May 18, 2021
Additional percentage of organization and offering expense of gross offering proceeds			1.00%
Estimated percentage of organization and offering expense of gross offering proceeds			1.00%
Advisor [Member] | Maximum [Member] | Primary Offering [Member]
Accounting Policies and General Information [Line Items]
Percentage of organization and offering costs to gross offering proceeds			1.00%
CFI and Company Reimbursement Agreement [Member]
Accounting Policies and General Information [Line Items]
Due from related party	$ 1,157,751		$ 1,157,751		1,059,256
CFI and Company Reimbursement Agreement [Member] | CFI [Member]
Accounting Policies and General Information [Line Items]
Due from related party	310,255		310,255		49,910
Organization And Offering Costs Payable [Member] | Advisor [Member]
Accounting Policies and General Information [Line Items]
Due to related parties	626,630		$ 626,630		789,661
Reimbursement liability beginning period			May 18, 2018
Organization And Offering Costs Payable [Member] | Advisor [Member] | Primary Offering [Member]
Accounting Policies and General Information [Line Items]
Due to related parties	626,630		$ 626,630		789,661
Reimbursement payments for costs incurred			920,917		587,774
Organizational Costs [Member] | Advisor [Member]
Accounting Policies and General Information [Line Items]
Due to related parties	90,676		90,676		90,232
Offering Costs [Member] | Advisor [Member]
Accounting Policies and General Information [Line Items]
Due to related parties	1,456,871		1,456,871		$ 1,287,203
Mezzanine Loan Investment [Member]
Accounting Policies and General Information [Line Items]
Impairment losses	$ 0	$ 0	0	$ 0
Preferred Equity Investment [Member]
Accounting Policies and General Information [Line Items]
Impairment losses			$ 0	$ 0