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Nature of Operations - Additional Information (Detail) $ in Thousands |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 03, 2018 | Dec. 31, 2019 USD ($) | Jan. 28, 2019 | Dec. 31, 2018 USD ($) | Aug. 21, 2018 | Dec. 31, 2017 USD ($)
Nature of Operations [Line Items] |  |  |  |  |  |
Cash and cash equivalents |  | $ 67,716 |  | $ 60,822 |  | $ 62,958
Working capital |  | 16,700 |  | 17,400 |  |
Undrawn debt facilities |  | $ 29,700 |  | $ 10,000 |  |
Koricancha Mill Joint Venture [member] |  |  |  |  |  |
Nature of Operations [Line Items] |  |  |  |  |  |
Ownership interest in joint venture sold |  |  |  |  | 83.00% |
Solaris Resources Inc [member] |  |  |  |  |  |
Nature of Operations [Line Items] |  |  |  |  |  |
Ownership interest in subsidiary | 60.00% | 30.00% |  |  |  |
Leagold Mining Corporation [member] |  |  |  |  |  |
Nature of Operations [Line Items] |  |  |  |  |  |
Business combination shares issued |  | 0.331 | 0.331 |  |  |

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