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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Property, Plant and Equipment [Line Items] |  |  |  |  |
Short-term investment maturity period |  |  | 3 months |  |
Weighted average number of common shares outstanding | 19,482,118 | 13,273,241 | 16,569,240 | 12,971,591 |
Exploration License Impairments | $ 0 | $ 0 | $ 0 | $ 0 |
Fair Value, Recurring [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Fair value, net asset (liability) | $ 0 |  | $ 0 |  | $ 0
Minimum [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and Equipment, estimated useful life |  |  | 3 years |  |
Maximum [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and Equipment, estimated useful life |  |  | 30 years |  |

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