Notes Receivable, Net - Additional Information (Details) - USD ($)			1 Months Ended	9 Months Ended		12 Months Ended
		Jul. 12, 2021	Aug. 31, 2022	Sep. 30, 2022		Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2022
Accounts Notes And Loans Receivable [Line Items]
Increase in allowance for credit loss				$ (858,000)
Decrease in allowance for credit loss				300,000
Notes receivable				124,801,000		$ 159,638,000
OP Units in settlement of note receivable		21,109				21,109
Settlement amount of note receivable in OP units		$ 500,000				$ 500,000
Note receivable accrued interest				15,098,000		21,148,000
Loan To Investors			$ 65,900,000
Notes receivable, net				123,966,000		153,886,000
Credit loss reserve			$ 500,000	835,000		5,752,000
Notes receivable, net				123,966,000		$ 153,886,000
Interest Rate						9.00%
Aggregate loans						$ 153,886,000
Core Note
Accounts Notes And Loans Receivable [Line Items]
Notes receivable						$ 13,500,000
Notes receivable maturity date						Jun. 01, 2022	Oct. 28, 2021
Notes receivable modified, subsequent payment default				21,600,000		$ 21,600,000
Fund II
Accounts Notes And Loans Receivable [Line Items]
Loan To Investors				65,900,000
Fund III
Accounts Notes And Loans Receivable [Line Items]
Increase in allowance for credit loss						$ 4,500,000
venture partner's interest obtained				$ 5,300,000
Equity method investment, ownership percentage				100.00%
Maturity Date						2020-07
Note receivable accrued interest				$ 4,700,000
Credit loss reserve				$ 4,600,000
Maximum
Accounts Notes And Loans Receivable [Line Items]
Maturity Date	[1]			2027-12
Interest Rate				9.00%	[1]	12.00%
Minimum
Accounts Notes And Loans Receivable [Line Items]
Maturity Date	[1]			2020-04
Interest Rate				4.65%	[1]	5.00%
Core Portfolio
Accounts Notes And Loans Receivable [Line Items]
Notes receivable	[1]			$ 124,801,000		$ 154,332,000
Note receivable accrued interest				5,700,000
Notes receivable, net				13,500,000				$ 16,000,000.0
Notes receivable, net				13,500,000				$ 16,000,000.0
Aggregate loans				123,966,000
Core Portfolio | Silver Spring, Maryland
Accounts Notes And Loans Receivable [Line Items]
Notes receivable, net						16,000,000.0
Notes receivable, net						16,000,000.0
Core Portfolio | Soho, New York
Accounts Notes And Loans Receivable [Line Items]
Notes receivable, net						43,000,000.0
Notes receivable, net						43,000,000.0
Core Portfolio | Three Tranches
Accounts Notes And Loans Receivable [Line Items]
Notes receivable, net						42,000,000.0
Notes receivable, net						$ 42,000,000.0
Structured Financing
Accounts Notes And Loans Receivable [Line Items]
Note receivable accrued interest				4,100,000
Loans amortized cost				0
Aggregate loans				27,900,000
Structured Financing | Non-Collateral Dependent Loans
Accounts Notes And Loans Receivable [Line Items]
Note receivable accrued interest				10,300,000
Credit loss reserve				800,000
Loans amortized cost				$ 111,300,000

[1] Includes one note receivable from an OP Unit holder, with a balance of $6.0 million at September 30, 2022 and December 31, 2021