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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Property, Plant and Equipment [Line Items] |  |  |
Short-term investment maturity period | 3 months |  |
Exploration license impairments | $ 0 | $ 0 | $ 0
Weighted average number of common shares outstanding | 17,310,915 | 13,296,687 | 10,538,114
Fair Value, Recurring [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Fair value, net asset (liability) | $ 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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