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Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Realized (loss) gain embedded derivative, net | $ (246) | $ 653 | $ 204 | $ 250
Unrealized (loss) gain embedded derivative, net | (232) | (103) | (48) | (232)
Total sales, net | 29,029 | 26,435 | 87,133 | 61,105
Dore |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Less: Treatment and refining charges | (21) | (67) | (112) | (212)
Total sales, net | 1,651 | 2,306 | 7,347 | 7,175
Gold Dore |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total sales, net | 1,634 | 1,495 | 6,816 | 5,155
Silver Dore |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total sales, net | 38 | 878 | 643 | 2,232
Concentrate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Less: Treatment and refining charges | (2,307) | (5,795) | (8,098) | (14,930)
Total sales, net | 27,856 | 23,579 | 79,630 | 53,912
Gold Concentrate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total sales, net | 8,709 | 5,211 | 22,904 | 13,894
Silver Concentrate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total sales, net | 6,179 | 6,857 | 19,443 | 14,638
Copper Concentrate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total sales, net | 2,447 | 2,911 | 9,547 | 6,470
Lead Concentrate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total sales, net | 3,641 | 3,501 | 8,641 | 8,730
Zinc Concentrate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total sales, net | $ 9,187 | $ 10,894 | $ 27,193 | $ 25,110

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