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Significant Accounting Policies - Investment in Marketable Securities (Details) - USD ($) | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Investment in Marketable Securities |  |
Marketable securities | $ 27,734,000 | $ 29,887,000
Equity marketable securities | 27,734,000 | 29,887,000
Fair Value |  |
Investment in Marketable Securities |  |
Marketable securities | 27,734,000 | 29,887,000
Equity marketable securities |  |
Investment in Marketable Securities |  |
Equity marketable securities | 0 | 0
Commercial mortgage-backed securities |  |
Investment in Marketable Securities |  |
Marketable securities | 27,734,000 | 29,887,000
Cost basis of commercial mortgage-backed securities | $ 27,500,000 | $ 27,500,000

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