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Asset Acquisition, Number of Common Stock Shares Acquired.

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Asset Acquisition, Percentage Equity Issued For Exchange Agreement

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Asset Acquisition, Percentage of Shares Acquired

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Equity Method Investment, Amount Sold, Shares

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- Definition

Investments in marketable securities.

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Amount of gain (loss) on sale or disposal of an equity method investment.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

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Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=120269885&loc=SL75117546-209714

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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 investment in marketable security, classified as noncurrent.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Amount of realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI).

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Amount of unrealized gain (loss) on investment in marketable security.

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-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

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- Definition

The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
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-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585

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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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Investments (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
Investments (Details) - USD ($) $ in Thousands	May 10, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Equity securities
Debt Securities, Available-for-sale [Line Items]
Cost		$ 138,167		$ 138,167		$ 7,668
Debt Securities, Available-for-sale [Abstract]
Marketable Securities, Realized Gain (Loss)		0	$ 33	(769)	$ 8,816
Unrealized gain (loss) on equity securities		(35,709)	$ 2,276	(3,702)	$ 12,307
Investment in Marketable Securities (Textual) [Abstract]
Marketable Securities, Noncurrent		$ 139,740		139,740		12,943
Equity Securities, FV-NI, Unrealized Gain (Loss)				2,522		5,276
Equity Securities, FV-NI, Unrealized Gain				949		1
Equity and debt securities
Investment in Marketable Securities (Textual) [Abstract]
Marketable Securities, Noncurrent						12,943
Metalla Royalty & Streaming Ltd.
Investment in Marketable Securities (Textual) [Abstract]
Proceeds from sale of equity method investments				900
Equity method investment, realized gain on disposal				$ 800
Equity method investment, amount sold (in shares)		83,556		83,556
Metalla Royalty & Streaming Ltd. \| Equity securities
Debt Securities, Available-for-sale [Line Items]
Cost						166
Investment in Marketable Securities (Textual) [Abstract]
Marketable Securities, Noncurrent						1,041
Equity Securities, FV-NI, Unrealized Gain (Loss)						875
Equity Securities, FV-NI, Unrealized Gain						0
Integra Resources Corp. [Member] \| Equity securities
Debt Securities, Available-for-sale [Line Items]
Cost		$ 9,455		$ 9,455		7,500
Investment in Marketable Securities (Textual) [Abstract]
Marketable Securities, Noncurrent		8,506		8,506		11,901
Equity Securities, FV-NI, Unrealized Gain (Loss)				0		4,401
Equity Securities, FV-NI, Unrealized Gain				949		0
Other Investments [Member] \| Equity securities
Debt Securities, Available-for-sale [Line Items]
Cost		2		2		2
Investment in Marketable Securities (Textual) [Abstract]
Marketable Securities, Noncurrent		2		2		1
Equity Securities, FV-NI, Unrealized Gain (Loss)				0		0
Equity Securities, FV-NI, Unrealized Gain				0		1
Victoria Gold Corp
Investment in Marketable Securities (Textual) [Abstract]
Asset acquisition, percentage of shares acquired	17.80%
Asset acquisition, number of common stock shares acquired	11,067,714
Asset acquisition, entity shares issued in exchange agreement (in shares)	12,785,485
Asset acquisition, percentage equity issued for exchange	4.90%
Victoria Gold Corp \| Equity securities
Debt Securities, Available-for-sale [Line Items]
Cost		128,710		128,710
Investment in Marketable Securities (Textual) [Abstract]
Marketable Securities, Noncurrent		131,232		131,232
Equity Securities, FV-NI, Unrealized Gain (Loss)				2,522
Equity Securities, FV-NI, Unrealized Gain				0
Level 3 \| Equity securities
Investment in Marketable Securities (Textual) [Abstract]
Marketable Securities, Noncurrent		$ 0		$ 0
Level 3 \| Equity and debt securities
Investment in Marketable Securities (Textual) [Abstract]
Marketable Securities, Noncurrent						$ 0