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v3.19.2

Organization and Basis of Presentation - Additional Information (Detail) |  | 6 Months Ended |  |  |
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Apr. 30, 2019 USD ($) Installment $ / ft² shares | Jun. 30, 2019 USD ($) shares | Feb. 15, 2019 shares | Jan. 01, 2019 USD ($) | Dec. 31, 2018 shares
Organization And Basis Of Presentation [Line Items] |  |  |  |  |
Capital stock, shares authorized | shares |  |  | 80,000,000 |  | 31,428,571
Lease ROU assets | $ |  | $ 142,000 |  |  |
Lease liabilities | $ |  | $ 142,000 |  |  |
ASU 2016-02 [Member] |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |
Lease ROU assets | $ |  |  |  | $ 170,000 |
Lease liabilities | $ |  |  |  | $ 170,000 |
2019 AMA [Member] | CDS [Member] |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |
Fixed annual payment | $ | $ 1,000,000 |  |  |  |
Agreement extended termination date | Dec. 31, 2027 |  |  |  |
Agreement original termination date | Dec. 31, 2022 |  |  |  |
Agreement additional extension term | 1 year |  |  |  |
Agreement notice period required for non-renewal | 180 days |  |  |  |
2019 AMA [Member] | CDS [Member] | Asset Management Fee [Member] |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |
Percentage of CRE portfolio revenues | 2.50% |  |  |  |
2019 AMA [Member] | CDS [Member] | Construction Management Fee [Member] |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |
Percentage of all costs associated with portfolio projects in development | 4.00% |  |  |  |
2019 AMA [Member] | CDS [Member] | Property Management Fee [Member] |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |
Percentage of CRE portfolio revenues | 1.00% |  |  |  |
2019 AMA [Member] | CDS [Member] | Acquisition Fee [Member] |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |
Maximum percentage of purchase price of an acquired asset | 0.50% |  |  |  |
2019 AMA [Member] | CDS [Member] | Disposition Fee [Member] |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |
Percentage sales price of an asset on disposition | 0.50% |  |  |  |
2019 AMA [Member] | Comstock Asset Management, L.C. [Member] |  |  |  |  |
Organization And Basis Of Presentation [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 |  |  |  |
2019 AMA [Member] | Comstock Asset Management, L.C. [Member] | Incentive Fee [Member] |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |
Percentage of free cash flow from real estate assets | 10.00% |  |  |  |
2019 AMA [Member] | Comstock Asset Management, L.C. [Member] | Investment Origination Fee [Member] |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |
Percentage of raised capital | 1.00% |  |  |  |
Business Management Agreement [Member] | Comstock Investors X, L.C. [Member] |  |  |  |  |
Organization And Basis Of Presentation [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 |  |  |  |
Class A [Member] |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |
Common stock, shares authorized | shares |  | 59,779,750 | 59,779,750 |  | 11,038,071
Class A [Member] | Master Transfer Agreement [Member] | CDS [Member] |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |
Shares issued | shares | 3,100,000 |  |  |  |
Class A [Member] | Master Transfer Agreement [Member] | FR54, LC [Member] |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |
Number of shared issued in exchange to related party | shares | 723,947 |  |  |  |
Series C Preferred Stock [Member] |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |
Preferred Stock, shares authorized | shares |  | 20,000,000 | 4,500,000 |  | 3,000,000
Series C Preferred Stock [Member] | Master Transfer Agreement [Member] | CDS [Member] |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |
Shares issued | shares | 1,220,000 |  |  |  |
Series C Preferred Stock [Member] | Master Transfer Agreement [Member] | FR54, LC [Member] |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |
Number of shares transferred by related party | shares | 579,158 |  |  |  |

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