Summary of Significant Accounting Policies - Narrative (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Accounting Policies [Abstract]
Recovery of previously reserved rent	$ 0	$ 1,047,000	$ 0
Adjustment for collectibility of rental income	0	0	11,774,000
Impairment of real estate investments	0	0	16,692,000
Accumulated amortization of deferred financing costs	8,000,000	9,000,000
Loss on extinguishment of debt	(10,827,000)	0	0
Stock-based compensation expense	$ 10,832,000	3,790,000	4,104,000
Number of reportable segments | segment	1
Accounting Policies [Line Items]
Provision for loan losses	$ 0	$ 0	1,076,000
Bridge loan
Accounting Policies [Line Items]
Provision for loan losses			$ 1,100,000