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Mineral Properties - Guadalupe (Details) |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 23, 2019 USD ($) | Oct. 24, 2018 USD ($) | Oct. 31, 2019 USD ($) | Apr. 30, 2019 USD ($) | Oct. 31, 2018 USD ($) | Oct. 31, 2017 USD ($) item | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Proceeds from option/sale agreements, net |  |  |  |  |  |  | $ 3,267,000 | $ 50,000
Deferred option gain |  |  |  |  |  |  | $ 2,960,000 |
Guadalupe De Los Reyes, Mexico | Option Agreement Two |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Interest has right to earn (as a percent) |  |  |  |  |  | 100.00% |  |
Sale price of gold/silver project |  |  |  |  |  | $ 6,000,000 |  |
Number of successive payments | item |  |  |  |  |  | 2 |  |
Back in Right (as a percent) |  |  |  |  |  | 49.00% |  |
Ownership interest if terms of option agreement not fulfilled (as a percent) |  |  |  |  |  | 0.00% |  |
Ownership to be transferred (as a percent) |  |  |  |  |  | 100.00% |  |
Proceeds from option/sale agreements, net | $ 100,000 | $ 50,000 | $ 1,500,000 | $ 1,500,000 | $ 150,000 | $ 1,500,000 |  |
Interest income |  |  |  | 67,000 |  |  |  |
Deferred option gain |  |  | $ 2,892,000 | 1,392,000 |  |  |  |
Value of carrying value for option payment proceeds to be recognized as contract liability |  |  |  | $ 0 |  |  |  |
Future payment |  |  |  |  | $ 1,500,000 |  |  |
Interest rate (as a percent) |  |  |  |  | 1.50% |  |  |
Revenue, Previous Performance Obligation, Expected Timing of Satisfaction, Period |  |  |  |  | 6 months |  |  |
Guadalupe De Los Reyes, Mexico | Option Agreement Two | Open Pit Mining |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Aggregate royalty payments to be received |  |  |  |  |  | 2,000,000 |  |
Guadalupe De Los Reyes, Mexico | Option Agreement Two | Execution of Option Agreement |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Sale price of gold/silver project |  |  |  |  |  | 1,500,000 |  |
Guadalupe De Los Reyes, Mexico | Option Agreement Two | One Year Anniversary |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Sale price of gold/silver project |  |  |  |  |  | 1,500,000 |  |
Guadalupe De Los Reyes, Mexico | Option Agreement Two | Two Year Anniversary |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Sale price of gold/silver project |  |  |  |  |  | 1,500,000 |  |
Guadalupe De Los Reyes, Mexico | Option Agreement Two | Before Four Year Anniversary |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Sale price of gold/silver project |  |  |  |  |  | $ 1,500,000 |  |
Guadalupe De Los Reyes, Mexico | Option Agreement Two | Minimum | Open Pit Mining |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Net smelter return royalty (as a percent) |  |  |  |  |  | 1.00% |  |
Gold price (USD per ounce) |  |  |  |  |  | $ 1,600 |  |
Guadalupe De Los Reyes, Mexico | Option Agreement Two | Minimum | Underground Mining |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Net smelter return royalty (as a percent) |  |  |  |  |  | 1.00% |  |
Gold price (USD per ounce) |  |  |  |  |  | $ 1,600 |  |
Guadalupe De Los Reyes, Mexico | Option Agreement Two | Maximum | Open Pit Mining |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Net smelter return royalty (as a percent) |  |  |  |  |  | 2.00% |  |
Gold price (USD per ounce) |  |  |  |  |  | $ 1,400 |  |
Guadalupe De Los Reyes, Mexico | Option Agreement Two | Maximum | Underground Mining |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Net smelter return royalty (as a percent) |  |  |  |  |  | 2.00% |  |
Gold price (USD per ounce) |  |  |  |  |  | $ 1,400 |  |
Guadalupe De Los Reyes, Mexico | Minera Gold Stake S A de C V | Option Agreement Two |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  | 100.00% |  |

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