Summary of Significant Accounting Policies - Impairment of Intangible and Long-Lived Assets (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) property	Dec. 31, 2020 USD ($) property	Dec. 31, 2019 USD ($)
Property, Plant and Equipment [Line Items]
Impairment loss	$ 340,000	$ 4,872,000	$ 0
Medical Office Building, Grand Rapids, Michigan
Property, Plant and Equipment [Line Items]
Impairment loss		$ 4,900,000
Number of medical office buildings | property		1
Medical Office Building, Traverse City, Michigan
Property, Plant and Equipment [Line Items]
Impairment loss	$ 300,000
Number of medical office buildings | property	1