Summary of Significant Accounting Policies - Narrative (Details)		3 Months Ended		6 Months Ended
	Aug. 05, 2016 shares	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
Property Plant And Equipment [Line Items]
Number of operating segments | segment				1
Improvements and replacements in excess of threshold, capitalized amount (as percent)		$ 1,000		$ 1,000
Improvements and replacements, useful life greater than or equal to one year, capitalization threshold (in years)				1 year
Construction management fee (as percent)				5.00%
Impairment of long-lived assets		0	$ 0	$ 0	$ 0
Future minimum payments receivable, current		7,700,000		7,700,000
Future minimum payments receivable, in two years		140,285		140,285
Future minimum payments receivable, thereafter		0		0
Allowance for uncollectible receivables		711		711			$ 5,593
Offering costs charged to APIC, accumulated		9,100,000		9,100,000
Payments of offering costs				249,000
Offering costs charged against equity		4,300,000		4,300,000
Due to related parties		12,944,582		12,944,582			12,993,287
Advisor
Property Plant And Equipment [Line Items]
Cumulative advances from related party		8,100,000		8,100,000
Reimbursed offering costs		747,000		747,000
Advisor
Property Plant And Equipment [Line Items]
Cumulative advances from related party		8,900,000		8,900,000
Deferred cash or noncash				4,800,000
Formation and other operating expenses				104,266
Due to related parties		10,914,436		10,914,436			10,955,805
Resource Securities
Property Plant And Equipment [Line Items]
Due to related parties		1,919,410		1,919,410			1,897,260
Resource Securities | Distribution and shareholder servicing fee
Property Plant And Equipment [Line Items]
Accrued estimate of distribution and shareholder servicing fee		71,313	$ 305,130	495,170	$ 659,906
Due to related parties		$ 1,913,360		$ 1,913,360			$ 1,818,555
Primary Offering Price | Advisor
Property Plant And Equipment [Line Items]
Approximate reimbursement of organization and offering expenses to be reimbursed, option one (as percent)				4.00%
Offering proceeds, threshold, option one (less than)				$ 500,000,000
Approximate reimbursement of organization and offering expenses to be reimbursed, option two (as percent)				2.50%
Offering proceeds, threshold, option two (more than)				$ 500,000,000
Convertible Stock
Property Plant And Equipment [Line Items]
Issuance of convertible shares (in shares) | shares	50,000
Class T Common Stock
Property Plant And Equipment [Line Items]
Annual fee, percentage of purchase price of common stock sold (as percent)				1.00%
Annual distribution and shareholder servicing fee, term				5 years
Triggering event to cease payment, percentage of gross proceeds (as percent)		10.00%		10.00%
Class T Common Stock | Resource Securities
Property Plant And Equipment [Line Items]
Annual fee, percentage of purchase price of common stock sold (as percent)				1.00%
Class T Common Stock | Resource Securities | Distribution and shareholder servicing fee
Property Plant And Equipment [Line Items]
Accrued estimate of distribution and shareholder servicing fee				$ 465,638
Percentage of shares sold (as percent)				5.00%
Payment of distribution and shareholder service fee				$ 207,141
Class R Common Stock
Property Plant And Equipment [Line Items]
Annual fee, percentage of purchase price of common stock sold (as percent)				1.00%
Triggering event to cease payment, percentage of gross proceeds (as percent)		10.00%		10.00%
Underwriting compensation as percentage of Class R gross offering price (as a percent)				8.50%
Class R Common Stock | Resource Securities
Property Plant And Equipment [Line Items]
Annual fee, percentage of purchase price of common stock sold (as percent)				1.00%
Triggering event to cease payment, percentage of gross proceeds (as percent)		10.00%		10.00%
Underwriting compensation as percentage of Class R gross offering price (as a percent)				8.50%
Class R Common Stock | Resource Securities | Distribution and shareholder servicing fee
Property Plant And Equipment [Line Items]
Accrued estimate of distribution and shareholder servicing fee				$ 2,400,000
Percentage of shares sold (as percent)				3.00%
Payment of distribution and shareholder service fee				$ 753,435
Minimum
Property Plant And Equipment [Line Items]
Remaining term of lease		1 month		1 month
Maximum
Property Plant And Equipment [Line Items]
Remaining term of lease		1 year		1 year
ASU 2016-02
Property Plant And Equipment [Line Items]
Present value of minimum lease payments						$ 9,304
Net Assets, Geographic Area | FL
Property Plant And Equipment [Line Items]
Concentration risk (as percent)				28.00%
Net Assets, Geographic Area | VA
Property Plant And Equipment [Line Items]
Concentration risk (as percent)				20.00%
Net Assets, Geographic Area | GA
Property Plant And Equipment [Line Items]
Concentration risk (as percent)				22.00%
Net Assets, Geographic Area | NC
Property Plant And Equipment [Line Items]
Concentration risk (as percent)				17.00%
Net Assets, Geographic Area | TX
Property Plant And Equipment [Line Items]
Concentration risk (as percent)				13.00%