Summary of Significant Accounting Policies - Summary of Carrying and Fair Values for Mortgage Notes Payable, Consolidated Derivative Instruments and Investments in Real Estate-Related Securities (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Significant Accounting Policies [Line Items]
Investments in real estate-related securities	$ 107,195
Estimated Fair Value | Level 2
Significant Accounting Policies [Line Items]
Investments in real estate-related securities	107,195
Estimated Fair Value | Level 3
Significant Accounting Policies [Line Items]
Mortgage notes payable, net	260,655
Estimated Fair Value | Interest Rate Cap [Member] | Level 2
Significant Accounting Policies [Line Items]
Interest rate caps	740
Carrying Value
Significant Accounting Policies [Line Items]
Mortgage notes payable, net	261,717
Investments in real estate-related securities	107,195
Carrying Value | Interest Rate Cap [Member]
Significant Accounting Policies [Line Items]
Interest rate caps	$ 740