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v3.21.1

DEBT - Additional Information (Detail) |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 19, 2020 USD ($) | Dec. 31, 2019 USD ($) note $ / shares | May 23, 2018 USD ($) $ / shares shares | Oct. 17, 2014 USD ($) | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) loan $ / shares | Mar. 27, 2020 USD ($) | Dec. 18, 2014 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Outstanding borrowings and accrued interest, net of discounts |  | $ 5,706,000 |  |  | $ 5,500,000 | $ 5,706,000 |  |
Debt instrument, gross |  |  |  |  | $ 5,505,000 |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Preferred stock par value (in dollars per share) | $ / shares |  | $ 0.01 |  |  | $ 0.01 | $ 0.01 |  |
CDS | Revolving Capital Line of Credit Agreement | Secured Financing |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 10,000,000.0 |  |  |  |  |  |  |
Debt instrument, term | 5 years |  |  |  |  |  |  |
Debt instrument maturity date from initial date | 12 months |  |  |  |  |  |  |
Capital line of credit drawn |  |  |  |  |  |  | $ 5,500,000 |
Comstock Growth Fund |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Interest payments |  |  |  |  | $ 400,000 | $ 600,000 |  |
Unsecured Seller-financed Promissory Note |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  | 1 year |  |  |
Number of unsecured seller-financed promissory note outstanding | note |  | 1 |  |  |  |  |  |
Debt instrument, gross |  | $ 595,000 |  |  | $ 5,000 | 595,000 |  |
Debt instrument, amount due on third anniversary |  | 50,000 |  |  |  | 50,000 |  |
Debt instrument, amount due on fourth anniversary |  | $ 50,000 |  |  |  | $ 50,000 |  |
Interest rate for period |  |  |  |  |  | 5.00% |  |
WSJ Prime Rate | Revolving Capital Line of Credit Agreement |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt instrument spread variable rate | 1.00% |  |  |  |  |  |  |
LIBOR Rate | Unsecured Seller-financed Promissory Note |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt instrument spread variable rate |  |  |  |  |  | 3.00% |  |
Secured Financing |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Fixed interest rate |  | 6.50% |  |  |  | 6.50% |  |
Number of secured loans | loan |  |  |  |  |  | 2 |  |
Secured Loan One |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Outstanding secured debt |  | $ 700,000 |  |  |  | $ 700,000 |  |
Secured Loan Two |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Outstanding secured debt |  | 27,000 |  |  |  | 27,000 |  |
Unsecured Notes Payable To Affiliate | Comstock Growth Fund |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Outstanding borrowings and accrued interest, net of discounts |  | $ 5,700,000 |  |  |  | 5,700,000 |  |
Unsecured Notes Payable To Affiliate | Comstock Growth Fund | Membership Exchange Agreement |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Retirement of debt |  |  |  |  | $ 5,700,000 |  |  |
Notes Payable, Other Payables | Comstock Growth Fund |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 20,000,000.0 |  |  |  | $ 25,000,000
Debt instrument, term |  |  |  | 3 years |  |  |  |
Debt instrument, initial principal amount |  |  |  | $ 10,000,000.0 |  |  |  |
Fixed interest rate |  |  | 10.00% |  |  |  |  |
Principal payments to CGF |  |  |  |  |  | $ 0 |  |
Notes Payable, Other Payables | Comstock Growth Fund | Membership Exchange Agreement |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Credit facility outstanding |  |  | $ 7,700,000 |  |  |  |  |
Percentage of membership interest |  |  | 91.50% |  |  |  |  |
Debt instrument reduction |  |  | $ 5,700,000 |  |  |  |  |
Notes Payable, Other Payables | Comstock Growth Fund | Membership Exchange Agreement | Series C- Non Convertible Preferred Stock |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Convertible preferred shares issued upon conversion (in shares) | shares |  |  | 1,482,300 |  |  |  |  |
Preferred stock par value (in dollars per share) | $ / shares |  |  | $ 0.01 |  |  |  |  |
Notes Payable, Other Payables | Comstock Growth Fund | Membership Exchange Agreement | Series C Preferred Stock |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Preferred stock liquidation value (in dollars per share) | $ / shares |  |  | $ 5.00 |  |  |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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