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Fair Value Measurement (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Total | $ 32,036 | $ 29,086
Fair value of non-current investment in equity securities | 200 |
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash bank deposits | 26,645 | 22,390
Gold and silver rounds/bullion | 3,664 | 3,812
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Receivables from provisional concentrate sales | $ 1,727 | $ 2,884

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