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Fair Value Disclosures - Additional Information (Detail) - USD ($)	Dec. 31, 2019	Jul. 23, 2019	Dec. 31, 2018
Fair Value, Option, Quantitative Disclosures [Line Items]
Investments in real estate ventures at fair value	$ 8,421,000	$ 9,306,000	$ 0
Level 3 [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Investments in real estate ventures at fair value	$ 8,400,000
Comstock Growth Fund One And Two [Member] | Series C- Non Convertible Preferred Stock [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Convertible preferred shares issued upon conversion	2,220,690
Preferred stock liquidation value per share	$ 5.00

X

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Number of shares issued for each share of convertible preferred stock that is converted.

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