Derivative Financial Instruments - Summary of Classification of Fair Value of Derivative Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Silver and Gold Concentrate Sales Agreements \| Prepaid expenses and other
Fair value of the derivative instruments
Fair value of derivative asset	$ 137	$ 481
Silver and Gold Concentrate Sales Agreements \| Accrued liabilities and other
Fair value of the derivative instruments
Fair value of derivative liability	420	$ 67
Embedded Derivative Financial Instruments \| Accrued liabilities and other
Fair value of the derivative instruments
Fair value of derivative liability	$ 9,269

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
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-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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-Section 50
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section 55
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-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313

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