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Organization and Basis of Presentation - Additional Information (Detail) | Apr. 30, 2019 USD ($) Installment | Mar. 31, 2019 USD ($) 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 |  | $ 156,000 |  |  |
Lease liabilities |  | $ 156,000 |  |  |
ASU 2016-02 [Member] |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |
Lease ROU assets |  |  |  | $ 170,000 |
Lease liabilities |  |  |  | $ 170,000 |
Subsequent Event [Member] | 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
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

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