Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Significant Accounting Policies [Line Items]
Fair value of mortgage notes and repurchase agreements	$ 25,000		$ 25,000
Deferred income	9,205		9,205		$ 6,707
Organization and offering expenses	$ 73,768		$ 73,768		63,341
Minimum REIT distribution percentage	90.00%		90.00%
Income tax (benefit) provision	$ 30	$ 100	$ (40)	$ 200
Deferred tax liability, net	100		100		100
Fair value of derivatives	5,200		5,200
Derivative liability, fair value, gross liability	$ 5,800		$ 5,800
Class S Shares (Member)
Significant Accounting Policies [Line Items]
Annual stockholder servicing fee percentage	0.85%		0.85%
Class S Shares (Member) | Maximum
Significant Accounting Policies [Line Items]
Upfront selling commissions and dealer manager fee percentage	3.50%		3.50%
Class T Shares (Member)
Significant Accounting Policies [Line Items]
Annual stockholder servicing fee percentage	0.85%		0.85%
Class T Shares (Member) | Maximum
Significant Accounting Policies [Line Items]
Upfront selling commissions and dealer manager fee percentage	3.50%		3.50%
Class D Shares (Member)
Significant Accounting Policies [Line Items]
Annual stockholder servicing fee percentage	0.25%		0.25%
Class D Shares (Member) | Maximum
Significant Accounting Policies [Line Items]
Upfront selling commissions and dealer manager fee percentage	1.50%		1.50%
Advanced Organization And Offering Costs
Significant Accounting Policies [Line Items]
Organization and offering expenses	$ 6,194		$ 6,194		$ 7,290
Advisor
Significant Accounting Policies [Line Items]
Period to reimburse the advisor for all organization and offering expenses			60 months		60 months
Advisor | Class T Shares (Member)
Significant Accounting Policies [Line Items]
Advisor Percentage of stockholder servicing fee on NAV per annum			0.65%
Advisor | Advanced Organization And Offering Costs
Significant Accounting Policies [Line Items]
Organization and offering expenses	$ 7,300		$ 7,300		$ 7,300
Dealer Manager | Class S Shares (Member) | Maximum
Significant Accounting Policies [Line Items]
Upfront selling commissions percentage	3.50%		3.50%
Dealer Manager | Class T Shares (Member)
Significant Accounting Policies [Line Items]
Upfront dealer manager fee percentage	0.50%		0.50%
Dealer stockholder servicing fee percentage			0.20%
Annual stockholder servicing fee percentage	0.85%		0.85%
Dealer Manager | Class T Shares (Member) | Maximum
Significant Accounting Policies [Line Items]
Upfront selling commissions percentage	3.00%		3.00%
Upfront selling commissions and dealer manager fee percentage	3.50%		3.50%
Dealer Manager | Class D Shares (Member)
Significant Accounting Policies [Line Items]
Upfront dealer manager fee percentage	0.00%		0.00%
Annual stockholder servicing fee percentage	0.25%		0.25%
Dealer Manager | Class D Shares (Member) | Maximum
Significant Accounting Policies [Line Items]
Upfront selling commissions percentage	1.50%		1.50%
Dealer Manager | Class S Share And T Shares [Member]
Significant Accounting Policies [Line Items]
Annual stockholder servicing fee percentage	0.85%		0.85%
Dealer Manager | Class I Shares (Member)
Significant Accounting Policies [Line Items]
Annual stockholder servicing fee percentage	0.00%		0.00%
Dealer Manager | Common Stock Class T, Class S and Class D
Significant Accounting Policies [Line Items]
Annual stockholder servicing fee percentage of gross proceeds limit	8.75%		8.75%
Other Revenue
Significant Accounting Policies [Line Items]
Other income	$ 200	$ 500	$ 600	$ 1,400
Accounts Payable, Accrued Expenses and Other Liabilities
Significant Accounting Policies [Line Items]
Deferred income	6,000		6,000		6,600
Due to Affiliates | Common Stock Class T, Class S and Class D
Significant Accounting Policies [Line Items]
Stockholder servicing fees accrued	$ 65,300		$ 65,300		$ 44,100