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Debt - Additional Information (Detail)					3 Months Ended		9 Months Ended
	Mar. 19, 2020 USD ($)	Dec. 31, 2019 USD ($) SecurityLoan promissory_note $ / shares	May 23, 2018 USD ($) $ / shares shares	Oct. 17, 2014 USD ($)	Sep. 30, 2020 USD ($) $ / shares	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) $ / shares	Sep. 30, 2019 USD ($)	Mar. 27, 2020 USD ($)	Dec. 18, 2014 USD ($)
Line of Credit Facility [Line Items]
Debt outstanding balance					$ 5,522,000		$ 5,522,000
Secured loan due on fourth anniversary					50,000		50,000
Due to affiliate		$ 5,706,000			$ 5,500,000		$ 5,500,000
Redeemable Series C Preferred Stock
Line of Credit Facility [Line Items]
Preferred stock par value (in dollars per share) | $ / shares		$ 0.01			$ 0.01		$ 0.01
Comstock Growth Fund
Line of Credit Facility [Line Items]
Interest payments					$ 100,000	$ 200,000	$ 300,000	$ 400,000
CDS | Revolving Capital Line of Credit Agreement | Secured Financing
Line of Credit Facility [Line Items]
Debt instrument term (in years)	5 years
Maximum borrowing capacity	$ 10,000,000.0
Debt instrument maturity date from initial date	12 months
Capital line of credit borrowed									$ 5,500,000
WSJ Prime Rate | Revolving Capital Line of Credit Agreement
Line of Credit Facility [Line Items]
Debt instrument spread variable rate	1.00%
Unsecured Seller-financed Promissory Note
Line of Credit Facility [Line Items]
Number of unsecured seller-financed promissory note outstanding | promissory_note		1
Debt outstanding balance		$ 595,000
Secured loan due on third anniversary					50,000		$ 50,000
Interest rate for period		5.00%
Debt instrument term (in years)							1 year
Debt instrument, balance amount					$ 22,000		$ 22,000
Unsecured Seller-financed Promissory Note | LIBOR Rate
Line of Credit Facility [Line Items]
Debt instrument spread variable rate							3.00%
Secured Financing
Line of Credit Facility [Line Items]
Number of secured loans | SecurityLoan		2
Fixed interest rate					6.50%		6.50%
Secured Loan One
Line of Credit Facility [Line Items]
Outstanding secured debt		$ 667,000
Secured Loan Two
Line of Credit Facility [Line Items]
Outstanding secured debt		27,000
Unsecured Notes Payable to Affiliate | Comstock Growth Fund
Line of Credit Facility [Line Items]
Due to affiliate		$ 5,700,000
Unsecured Notes Payable to Affiliate | Comstock Growth Fund | Membership Exchange Agreement
Line of Credit Facility [Line Items]
Repayments of debt					$ 5,700,000
Notes Payable, Other Payables | Membership Exchange Agreement
Line of Credit Facility [Line Items]
Principal payments to CGF						0		0
Notes Payable, Other Payables | Revolving Capital Line of Credit Agreement
Line of Credit Facility [Line Items]
Principal payments to CGF					$ 0	$ 0	$ 0	$ 0
Notes Payable, Other Payables | Comstock Growth Fund
Line of Credit Facility [Line Items]
Debt instrument term (in years)				3 years
Debt instrument, initial principal amount				$ 10,000,000.0
Maximum borrowing capacity				$ 20,000,000.0						$ 25,000,000
Notes Payable, Other Payables | Comstock Growth Fund | Membership Exchange Agreement
Line of Credit Facility [Line Items]
Percentage of membership interest			91.50%
Debt instrument reduction			$ 5,700,000
Debt instrument fixed interest rate (in percentage)			10.00%
Due to affiliate			$ 7,700,000
Notes Payable, Other Payables | Comstock Growth Fund | Membership Exchange Agreement | Series C Non-Convertible Preferred Stock
Line of Credit Facility [Line Items]
Convertible preferred shares issued upon conversion (in shares) | shares			1,482,300
Preferred stock par value (in dollars per share) | $ / shares			$ 0.01
Notes Payable, Other Payables | Comstock Growth Fund | Membership Exchange Agreement | Redeemable Series C Preferred Stock
Line of Credit Facility [Line Items]
Preferred stock liquidation value (in dollars per share) | $ / shares			$ 5.00

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Debt instrument maturity date from initial date.

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Debt instrument reduced carrying value.

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

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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