Summary of Significant Accounting Principles - Additional Information (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) Loan Entity Segment	Dec. 31, 2018 USD ($) Loan	Dec. 31, 2017 USD ($)	Jan. 01, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Percentage of ownership interests in operating partnership	98.30%	69.70%
Allowance for loan losses	$ 0	$ 0
Provision for impairment	2,918,000	4,503,000	$ 2,377,000
Deposits	8,304,000	4,236,000	7,250,000
Deposits in excess of amount insured by FDIC	8,100,000	4,000,000
Adjustment to rental revenue for tenant credit	600,000
Contingent rent	900,000	1,100,000	1,100,000
Capitalized offering costs	$ 49,000,000	35,100,000
Percentage of taxable income require to REIT	90.00%
Provision for income tax	$ 0
Uncertain tax positions, interest or penalties	0	0
Uncertain tax position, interest or penalties accrued	0	0
Mortgage loan receivable	$ 89,628,000	$ 14,854,000
Number of loan receivable agreements secured | Loan	7	4
Aggregate carrying value of loans receivable	$ 89,600,000	$ 14,900,000	0
Number of reportable segments | Segment	1
Common stock, conversion basis	one-for-one basis
Right-of-use asset	$ 4,800,000
Lease liability	7,522,000
ASU 2016-02
Summary Of Significant Accounting Policies [Line Items]
Right-of-use asset				$ 4,800,000
Lease liability				$ 4,800,000
Variable Interest Entity Not Primary Beneficiary ("VIEs") | Mortgage Loan Receivable
Summary Of Significant Accounting Policies [Line Items]
Mortgage loan receivable		5,700,000
Mortgage loan receivable, maximum loss exposure		5,700,000
Liabilities associated with investment	$ 0	0
Number of loan receivable agreements secured | Loan	0
Aggregate carrying value of loans receivable	$ 60,500,000
Number of variable interest entities | Entity	7
Federal
Summary Of Significant Accounting Policies [Line Items]
Open tax year	2016 2017 2018 2019
State
Summary Of Significant Accounting Policies [Line Items]
Open tax year	2016 2017 2018 2019
Base Rent
Summary Of Significant Accounting Policies [Line Items]
Allowance for doubtful accounts receivable		200,000
Straight-line Rent
Summary Of Significant Accounting Policies [Line Items]
Allowance for doubtful accounts receivable		0
Maximum | ASU 2016-13
Summary Of Significant Accounting Policies [Line Items]
Percentage of cumulative effect of adjustment to beginning retained earnings to loan portfolio	0.50%
Real Estate Investments
Summary Of Significant Accounting Policies [Line Items]
Depreciation	$ 36,400,000	$ 24,800,000	$ 14,000,000
Buildings | Maximum
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life	40 years
Site Improvements
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life	15 years