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Related Party Transactions - Additional Information (Detail) |  |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |
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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 |

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