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Fair Value Measurements - Detailed Information about Fair Value of Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of financial assets and liabilities [Line Items] |  |
Financial assets | $ 110,225 | $ 97,505
Financial liabilities | 406,521 | 281,720
Cash and cash equivalents [member] |  |
Disclosure of financial assets and liabilities [Line Items] |  |
Financial assets | 67,716 | 60,822
Restricted cash [member] |  |
Disclosure of financial assets and liabilities [Line Items] |  |
Financial assets | 15,285 | 15,596
Receivable from Serabi [member] |  |
Disclosure of financial assets and liabilities [Line Items] |  |
Financial assets | 12,033 | 10,909
Long term receivables [member] |  |
Disclosure of financial assets and liabilities [Line Items] |  |
Financial assets | 11,986 | 7,629
Reclamation bonds and other receivables [member] |  |
Disclosure of financial assets and liabilities [Line Items] |  |
Financial assets | 577 | 767
Marketable securities [member] | Financial assets at FVTPL: [member] |  |
Disclosure of financial assets and liabilities [Line Items] |  |
Financial assets | 988 | 1,782
Collars [member] | Financial assets at FVTPL: [member] |  |
Disclosure of financial assets and liabilities [Line Items] |  |
Financial assets | 1,640 | 0
Traded warrants [member] | Financial liabilities at FVTPL: [member] |  |
Disclosure of financial assets and liabilities [Line Items] |  |
Financial liabilities | 26,056 | 9,730
Non-traded warrants [member] | Financial liabilities at FVTPL: [member] |  |
Disclosure of financial assets and liabilities [Line Items] |  |
Financial liabilities | 30,090 | 9,131
Accounts payable and accrued liabilities [member] |  |
Disclosure of financial assets and liabilities [Line Items] |  |
Financial liabilities | 67,047 | 55,460
Convertible Notes [member] |  |
Disclosure of financial assets and liabilities [Line Items] |  |
Financial liabilities | 137,995 | 0
Revolving Credit Facility [member] |  |
Disclosure of financial assets and liabilities [Line Items] |  |
Financial liabilities | 120,225 | 84,844
Debenture [member] |  |
Disclosure of financial assets and liabilities [Line Items] |  |
Financial liabilities | 10,061 | 17,746
Sprott Facility [member] |  |
Disclosure of financial assets and liabilities [Line Items] |  |
Financial liabilities | 0 | 18,452
Aurizona Credit Facility [member] |  |
Disclosure of financial assets and liabilities [Line Items] |  |
Financial liabilities | 0 | 67,627
Standby Loan [member] |  |
Disclosure of financial assets and liabilities [Line Items] |  |
Financial liabilities | 13,252 | 12,000
Production-linked liability [member] |  |
Disclosure of financial assets and liabilities [Line Items] |  |
Financial liabilities | 0 | 5,024
Other liabilities [member] |  |
Disclosure of financial assets and liabilities [Line Items] |  |
Financial liabilities | $ 1,795 | $ 1,706

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