Concentration of Credit Risk - Schedule of Geographical Concentration of Credit Risk (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Percentage of Total Company Revenues | Customer Concentration Risk | Life science | Largest Tenant
Concentration Risk [Line Items]
Concentration risk (as a percent)	3.00%
Percentage of Total Company Revenues | Customer Concentration Risk | Medical Office | Largest Tenant
Concentration Risk [Line Items]
Concentration risk (as a percent)	8.00%
California | Percentage of Total Company Assets | Geographic Concentration Risk | Continuing Operations
Concentration Risk [Line Items]
Concentration risk (as a percent)	34.00%	30.00%
California | Percentage of Total Company Revenues | Geographic Concentration Risk | Continuing Operations
Concentration Risk [Line Items]
Concentration risk (as a percent)	28.00%	21.00%	22.00%
Florida | Percentage of Total Company Assets | Geographic Concentration Risk | Continuing Operations
Concentration Risk [Line Items]
Concentration risk (as a percent)	11.00%	10.00%
Florida | Percentage of Total Company Revenues | Geographic Concentration Risk | Continuing Operations
Concentration Risk [Line Items]
Concentration risk (as a percent)	17.00%	14.00%	2.00%
Texas | Percentage of Total Company Assets | Geographic Concentration Risk | Continuing Operations
Concentration Risk [Line Items]
Concentration risk (as a percent)	10.00%	9.00%
Texas | Percentage of Total Company Revenues | Geographic Concentration Risk | Continuing Operations
Concentration Risk [Line Items]
Concentration risk (as a percent)	11.00%	9.00%	11.00%
Massachusetts | Percentage of Total Company Assets | Geographic Concentration Risk | Continuing Operations
Concentration Risk [Line Items]
Concentration risk (as a percent)	16.00%	11.00%
Massachusetts | Percentage of Total Company Revenues | Geographic Concentration Risk | Continuing Operations
Concentration Risk [Line Items]
Concentration risk (as a percent)	9.00%	4.00%	2.00%