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Mineral Properties, Long Valley (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Property, Plant and Equipment [Line Items] |  |
Proceeds from sale | $ 50 | $ 1,761
Gain on disposal of mineral property |  | 358
Long Valley [Member] | Sold | Mineral Rights |  |
Property, Plant and Equipment [Line Items] |  |
Proceeds from sale |  | 358
Gain on disposal of mineral property |  | $ 358
Long Valley [Member] | Sold | Mineral Rights | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Net smelter return royalty (as a percent) |  | 0.50%
Long Valley [Member] | Sold | Mineral Rights | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Net smelter return royalty (as a percent) |  | 2.00%
Long Valley [Member] | Sold | Mineral Rights | One Month after the Start of Production [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Future payment |  | $ 500
Long Valley [Member] | Sold | Mineral Rights | On or Prior to the First Anniversary of the Start of Production [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Future payment |  | $ 500

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- Definition Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4582445-111684 + Details
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- Definition This element represents the cash inflow during the period from the sale of a component of the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130556-203045 + Details
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- Details
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