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Short-term and Other Investments - Summary (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2021	Dec. 31, 2020
Other Investments
Proceeds from Sale and Maturity of Marketable Securities		$ 954
Other investments, at fair value			$ 340	$ 293
Midas Gold Shares [Member]
Other Investments
Number Marketable Securities Sold	1,572,500	2,214,500
Proceeds from Sale and Maturity of Marketable Securities	$ 654	$ 954
Marketable Securities, Realized Gain (Loss)	$ 135	$ 120
Nusantara Resources
Other Investments
Shares owned			1,333,334	1,333,334

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
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- Definition

Balance held at close of period in number of shares.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

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Total number marketable securities sold during the period.

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