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Marketable Securities (Schedule of Marketable Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of financial assets [line items] |  |
Current financial assets | $ 556 | $ 1,579
Derivative Warrants [member] | Medgold Resources Corporation [member] |  |
Disclosure of financial assets [line items] |  |
Current financial assets |  | 313
Derivative Warrants [member] | Prospero Silver Corporation [member] |  |
Disclosure of financial assets [line items] |  |
Current financial assets | 1 |
Equity investments [member] | Medgold Resources Corporation [member] |  |
Disclosure of financial assets [line items] |  |
Current financial assets |  | $ 1,266
Equity investments [member] | Prospero Silver Corporation [member] |  |
Disclosure of financial assets [line items] |  |
Current financial assets | $ 555 |

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- Definition The amount of current financial assets. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_25&doctype=Standard -URIDate 2017-03-09 + Details
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