Related Party Transactions - Narrative (Details) $ in Thousands, ft² in Millions		1 Months Ended	3 Months Ended
	Sep. 20, 2017 USD ($) shares	Feb. 28, 2019 USD ($)	Mar. 31, 2019 USD ($) ft² shares	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Related Party Transaction [Line Items]
Area of real estate property (in sqft) | ft²			7.3
Incurred			$ 5,805	$ 5,966
Real estate property			$ 1,182,342		$ 1,182,214
Class T
Related Party Transaction [Line Items]
Outstanding shares owned by affiliates (shares) | shares			280
Stockholder servicing fee			0.00274%
Class S
Related Party Transaction [Line Items]
Outstanding shares owned by affiliates (shares) | shares			280
Stockholder servicing fee			0.00274%
Class D
Related Party Transaction [Line Items]
Outstanding shares owned by affiliates (shares) | shares			283
Stockholder servicing fee			0.00068%
Class I
Related Party Transaction [Line Items]
Outstanding shares owned by affiliates (shares) | shares			283,016
Class A
Related Party Transaction [Line Items]
Outstanding shares owned by affiliates (shares) | shares			287,449
The Advisor
Related Party Transaction [Line Items]
Due from related parties			$ 1,300
Shares sold to Advisor	$ 2,500
The Advisor | Class T
Related Party Transaction [Line Items]
Shares sold to Advisor (shares) | shares	264
The Advisor | Class S
Related Party Transaction [Line Items]
Shares sold to Advisor (shares) | shares	264
The Advisor | Class D
Related Party Transaction [Line Items]
Shares sold to Advisor (shares) | shares	264
The Advisor | Class I
Related Party Transaction [Line Items]
Shares sold to Advisor (shares) | shares	263,200
Organizational and offering costs advanced by the Advisor
Related Party Transaction [Line Items]
Incurred			$ 3	240
Advisory Agreement | Class T
Related Party Transaction [Line Items]
Stockholder servicing fee			0.00342%
Performance distribution allocation
Related Party Transaction [Line Items]
Percentage of performance distribution allocation			12.50%
Performance Distribution, Hurdle Rate, Annualized Rate Of Return On Net Asset Value			5.50%
Related party transaction		$ 3,900
Incurred			$ 1,920	2,061
Dealer Manager Agreement
Related Party Transaction [Line Items]
Underwriting compensation as percent of proceeds (percent)			10.00%
Dealer Manager Agreement | Class T
Related Party Transaction [Line Items]
Stockholder servicing fee			0.00274%
Dealer Distribution Fee | Class T
Related Party Transaction [Line Items]
Stockholder servicing fee			0.00068%
Advisor Distribution Fee | Class T
Related Party Transaction [Line Items]
Stockholder servicing fee			0.00205%
Reimbursement, Services Provided That Are not Entitled to Advisor Fees | The Advisor
Related Party Transaction [Line Items]
Incurred			$ 200	150
Reimbursement, Reimbursible Expenses
Related Party Transaction [Line Items]
Average invested assets for preceding 12 months (percent)			2.00%
Percentage of Company's net income before addition of reserves (percent)			25.00%
Reimbursement, Reimbursible Expenses | The Advisor
Related Party Transaction [Line Items]
Incurred			$ 0	10
Property management fees
Related Party Transaction [Line Items]
Incurred			$ 481	$ 459
Property manager oversight fee as percent of gross revenues of property managed (percent)			1.00%
Limited partnership units | Performance distribution allocation
Related Party Transaction [Line Items]
Related party transaction		$ 3,900
Cash election under transaction agreement		50.00%