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Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Realized/unrealized embedded derivative, net | $ (2,303) | $ (24) | $ (1,732) | $ 511
Sales Revenue, Goods, Net, Total | 30,768 | 21,391 | $ 62,919 | 45,727
Concentrate Sale Percentage Based On Provisional Sales Price |  |  | 100.00% |
Dore [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Less: Treatment and refining charges | (38) | (5) | $ (63) | (22)
Total sales, net | 2,156 | 1,451 | 4,337 | 3,082
Dore [Member] | Gold |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | 1,722 | 1,435 | 3,631 | 3,062
Dore [Member] | Silver |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | 472 | 21 | 769 | 42
Concentrate [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Less: Treatment and refining charges | (1,261) | (1,479) | (3,095) | (2,987)
Total sales, net | 30,915 | 19,964 | 60,314 | 42,134
Concentrate [Member] | Gold |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | 5,396 | 4,514 | 10,937 | 11,600
Concentrate [Member] | Silver |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | 8,803 | 5,604 | 14,884 | 12,892
Concentrate [Member] | Copper |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | 2,638 | 1,219 | 5,018 | 2,529
Concentrate [Member] | Lead |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | 3,498 | 2,316 | 7,345 | 4,254
Concentrate [Member] | Zinc |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | $ 11,841 | $ 7,790 | $ 25,225 | $ 13,846

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