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Accrued Expenses - Additional Information (Detail) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | --- | ---
Accrued incentive awards | $ 800,000 | $ 300,000 |
Earnest Money Deposit | (450,000) | $ (450,000) |
Other Operating accured exploration permit expenses | $ 900,000 |  |
Greg Stemm Our Past Chairman [Member] |  |  |
Earnest Money Deposit |  |  | $ 450,000

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