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- Definition

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

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No definition available.

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- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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- Definition

Amount of realized loss from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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- Definition

Amount of unrealized loss on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Change in Accounting Principle - Other Income Related to the Sale of Exploration Properties (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2018	Aug. 31, 2016
Change in Accounting Principle
Accumulated Deficit			$ (517,963,000)			$ (511,391,000)
Gain on sale of assets			144,000	$ 4,335,000
Trading securities		$ 238,000			$ 238,000
Available for sale equity unrealized losses					$ 40,000
Retained earnings and other comprehensive income adjustment				(40,000)
Trading securities loss				51,000
Sale, not discontinued operations \| Zacatecas
Change in Accounting Principle
Total consideration			$ 1,500,000				$ 1,500,000
Gain on sale of assets				$ 336,000
Sale, not discontinued operations \| Zacatecas \| ASU 2014-09 Revenue from Contracts with Customers
Change in Accounting Principle
Gain on sale of assets	$ 49,000
Sale, not discontinued operations \| Previously Reported \| Zacatecas
Change in Accounting Principle
Gain on sale of assets		$ 49,000
Sale, not discontinued operations \| Cumulative Effect Adjustment \| Zacatecas \| ASU 2014-09 Revenue from Contracts with Customers
Change in Accounting Principle
Accumulated Deficit						$ (49,000)