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v3.19.1

Related Party Transactions - Additional Information (Detail) - USD ($) |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
May 23, 2018 | Mar. 22, 2017 | Dec. 29, 2015 | Sep. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Future minimum lease payments |  |  |  |  |  | $ 400,000 |
Lease expiration date |  |  |  |  |  | Sep. 30, 2019 |
Revenue-asset management |  |  |  |  |  | $ 56,749,000 | $ 45,430,000
Credit facility outstanding |  |  | $ 5,000,000 |  |  |  |
Income tax expense (benefit) |  |  |  |  |  | (920,000) | $ 38,000
Gains on extinguishment of Series B preferred stock and issuance of Series C preferred stock |  | $ 1,011,000 |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Shares exchanged pursuant to agreement, converted |  | 858,210 |  |  |  |  |
Paid-in-kind dividends on preferred stock, number of shares |  |  |  |  |  |  | 15,663
Paid-in-kind dividends on preferred stock, liquidation value |  |  |  |  |  |  | $ 78,000
Comstock Growth Fund II, L.C. [Member] | Notes Payable, Other Payables [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Gain loss on conversion of notes |  |  |  |  |  | $ 3,700,000 |
Income tax expense (benefit) |  |  |  | $ (500,000) | $ (500,000) |  |
Comstock Growth Fund II, L.C. [Member] | Notes Payable, Other Payables [Member] | Note Exchange Agreement [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Credit facility outstanding | $ 3,700,000 |  |  |  |  |  | $ 3,600,000
Series C Preferred Stock [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Preferred stock par value per share |  |  |  |  |  | $ 0.01 | $ 0.01
Shares exchanged pursuant to agreement, issued |  | 772,210 |  |  |  |  |
Par value per share |  | $ 0.01 |  |  |  |  |
Stated value per share |  | $ 5.00 |  |  |  |  |
Paid-in-kind dividends on preferred stock, number of shares |  |  |  |  |  |  | 0
Asset Management [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Revenue-asset management |  |  |  |  |  | $ 12,473,000 | $ 0
Comstock Asset Management, L.C. [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Total rental payments made under lease agreement |  |  |  |  |  | 400,000 | 200,000
Rent expense |  |  |  |  |  | 400,000 | 200,000
Fixed annual payment |  |  |  |  |  | 1,000,000 |
Comstock Asset Management, L.C. [Member] | Trade Receivables [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Related parties |  |  |  |  |  | 0 | 145,000
Comstock Asset Management, L.C. [Member] | Services and out of Pocket Expenses Incurred [Member] | Revenue - Real Estate Services [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Services and out-of-pocket expenses incurred |  |  |  |  |  | 120,000 | 1,100,000
Comstock Asset Management, L.C. [Member] | Asset Management [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Revenue-asset management |  |  |  |  |  | 12,000,000 |
Stonehenge [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Original principal amount |  |  | 4,500,000 |  |  |  |
Principal amount outstanding plus all accrued but unpaid interest |  |  | $ 3,900,000 |  |  |  |
Stonehenge [Member] | Series B Preferred Stock [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Shares issued upon conversion of debt |  |  | 772,210 |  |  |  |
Preferred stock par value per share |  |  | $ 0.01 |  |  |  |
Preferred stock redemption price |  |  | $ 5.00 |  |  |  |
Preferred stock dividend rate, percentage |  |  | 8.75% |  |  |  |
Comstock Growth Fund II, L.C. [Member] | Note Exchange Agreement [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Gain loss on conversion of notes | 3,700,000 |  |  |  |  | 3,700,000 |
Income tax expense (benefit) | (500,000) |  |  |  |  | $ (900,000) |
Comstock Growth Fund II, L.C. [Member] | Comstock Growth Fund II, L.C. [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Debt instrument, initial principal amount |  |  | $ 5,000,000 |  |  |  |
Comstock Growth Fund II, L.C. [Member] | Notes Payable, Other Payables [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Credit facility outstanding |  |  | 5,000,000 |  |  |  |
Maximum borrowing amount |  |  | $ 10,000,000 |  |  |  |
Debt instrument, term |  |  | 2 years |  |  |  |
Debt instrument, floor interest rate |  |  | 10.00% |  |  |  |
Line of credit facility additional extension period |  |  | 1 year |  |  |  |
Debt instrument, interest payment terms |  |  |  |  |  | Interest payments will be accrued and paid in kind monthly for the first year, and then paid current monthly in arrears beginning December 31, 2016. |
Comstock Growth Fund II, L.C. [Member] | Notes Payable, Other Payables [Member] | Note Exchange Agreement [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Credit facility outstanding | $ 3,700,000 |  |  |  |  |  | $ 3,600,000
Series C- Non Convertible Preferred Stock [Member] | Comstock Growth Fund II, L.C. [Member] | Notes Payable, Other Payables [Member] | Note Exchange Agreement [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Preferred stock par value per share | $ 0.01 |  |  |  |  |  |
Convertible preferred shares issued upon conversion | 738,390 |  |  |  |  |  |
Series C Preferred Stock [Member] | Comstock Growth Fund II, L.C. [Member] | Notes Payable, Other Payables [Member] | Note Exchange Agreement [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Preferred stock liquidation value per share | $ 5.00 |  |  |  |  |  |

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