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Prepaid Expenses and Other Assets, net - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Investment Holdings |  |  |  |
Unrealized gain (loss) on non-real estate investments | $ 827,000 | $ 513,000 | $ 11,620,000 | $ (2,335,000)
Gain (loss) recognized on stock purchase warrant | (200,000) | 0 | 1,700,000 | 0
Non Real Estate Investment That Does Not Report NAV |  |  |  |
Investment Holdings |  |  |  |
Unrealized gain (loss) on non-real estate investments | $ 1,000,000 | $ 500,000 | $ 9,900,000 | $ (2,300,000)

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- Definition Amount of unrealized gain (loss) on investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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