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Related Party Transactions - Additional Information (Detail)				3 Months Ended						6 Months Ended		9 Months Ended		12 Months Ended
	Jan. 01, 2020 Property	Dec. 30, 2019 USD ($)	Apr. 30, 2019 USD ($) Installment $ / ft²	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2019 USD ($) Property	Dec. 31, 2018 USD ($)	May 23, 2018 USD ($) $ / shares shares	Dec. 29, 2015 USD ($)
Related Party Transaction [Line Items]
Future minimum lease payments														$ 400,000
Lease expiration date															Sep. 30, 2020
Revenue-asset management														25,317,000	$ 16,447,000
Credit facility outstanding																	$ 5,000,000
Comstock Growth Fund II, L.C. [Member]
Related Party Transaction [Line Items]
Debt instrument, initial principal amount																	$ 5,000,000
Notes Payable, Other Payables [Member] \| Note Exchange Agreement [Member] \| Comstock Growth Fund II, L.C. [Member]
Related Party Transaction [Line Items]
Credit facility outstanding																$ 3,700,000
Comstock Partners, L.C. [Member]
Related Party Transaction [Line Items]
Acquisition fee received		$ 500,000
Asset Management [Member]
Related Party Transaction [Line Items]
Revenue-asset management				$ 4,780,000	$ 4,450,000	$ 4,211,000	$ 3,085,000	$ 3,184,000	$ 2,791,000	$ 8,661,000	$ 5,975,000	$ 13,441,000	$ 9,060,000	19,605,000	13,416,000
Comstock Asset Management, L.C. [Member]
Related Party Transaction [Line Items]
Total rental payments made under lease agreement														600,000	400,000
Rent expense														$ 600,000	400,000
Fixed annual payment															1,000,000
Comstock Asset Management, L.C. [Member] \| 2019 Amended Asset Management Agreement [Member]
Related Party Transaction [Line Items]
Cumulative, compounded, preferred return rate			8.00%
Leasing fee per square foot for new leases \| $ / ft²			1.00
Leasing fee per square foot for renewal leases \| $ / ft²			0.50
Comstock Asset Management, L.C. [Member] \| 2019 Amended Asset Management Agreement [Member] \| Incentive Fee [Member]
Related Party Transaction [Line Items]
Percentage of free cash flow from real estate assets			10.00%
Comstock Asset Management, L.C. [Member] \| 2019 Amended Asset Management Agreement [Member] \| Investment Origination Fee [Member]
Related Party Transaction [Line Items]
Percentage of raised capital			1.00%
Comstock Asset Management, L.C. [Member] \| Asset Management [Member]
Related Party Transaction [Line Items]
Revenue-asset management															$ 12,000,000
CDS [Member] \| Residential Property Management Agreements [Member]
Related Party Transaction [Line Items]
Number of property into agreement \| Property														2
Property management agreements initial term														1 year
Property management agreements renewal term														1 year
CDS [Member] \| Construction Management Agreement [Member] \| Subsequent Events [Member]
Related Party Transaction [Line Items]
Number of property into agreement \| Property	2
CDS [Member] \| Construction Management Agreement [Member] \| Minimum [Member] \| Subsequent Events [Member]
Related Party Transaction [Line Items]
Percentage of construction management fee	1.00%
CDS [Member] \| Construction Management Agreement [Member] \| Maximum [Member] \| Subsequent Events [Member]
Related Party Transaction [Line Items]
Percentage of construction management fee	4.00%
CDS [Member] \| 2019 Amended Asset Management Agreement [Member]
Related Party Transaction [Line Items]
Fixed annual payment			$ 1,000,000
Agreement extended termination date			Dec. 31, 2027
Agreement additional extension term			1 year
Agreement notice period required for non-renewal			180 days
CDS [Member] \| 2019 Amended Asset Management Agreement [Member] \| Asset Management Fee [Member]
Related Party Transaction [Line Items]
Percentage of CRE portfolio revenues			2.50%
CDS [Member] \| 2019 Amended Asset Management Agreement [Member] \| Construction Management Fee [Member]
Related Party Transaction [Line Items]
Percentage of all costs associated with portfolio projects in development			4.00%
CDS [Member] \| 2019 Amended Asset Management Agreement [Member] \| Property Management Fee [Member]
Related Party Transaction [Line Items]
Percentage of CRE portfolio revenues			1.00%
CDS [Member] \| 2019 Amended Asset Management Agreement [Member] \| Acquisition Fee [Member]
Related Party Transaction [Line Items]
Maximum percentage of purchase price of an acquired asset			0.50%
CDS [Member] \| 2019 Amended Asset Management Agreement [Member] \| Disposition Fee [Member]
Related Party Transaction [Line Items]
Percentage sales price of an asset on disposition			0.50%
Comstock Investors X [Member] \| Business Management Agreement [Member]
Related Party Transaction [Line Items]
Aggregate fee payable			$ 937,500
Number of installments of fee payment \| Installment			15
Aggregate fee payable, frequency of periodic payment														quarterly
Fee payable in installments			$ 62,500
Hartford Investment [Member]
Related Party Transaction [Line Items]
Investment related to the purchase		$ 1,200,000
Series C- Non Convertible Preferred Stock [Member] \| Notes Payable, Other Payables [Member] \| Note Exchange Agreement [Member] \| Comstock Growth Fund II, L.C. [Member]
Related Party Transaction [Line Items]
Convertible preferred shares issued upon conversion \| shares																738,390
Preferred stock par value per share \| $ / shares																$ 0.01
Series C Preferred Stock [Member] \| Notes Payable, Other Payables [Member] \| Note Exchange Agreement [Member] \| Comstock Growth Fund II, L.C. [Member]
Related Party Transaction [Line Items]
Preferred stock liquidation value per share \| $ / shares																$ 5.00