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Short-term and Other Investments - Summary (Details) $ in Thousands		3 Months Ended	9 Months Ended
	Oct. 06, 2021 USD ($)	Sep. 30, 2020 USD ($) shares	Sep. 30, 2020 USD ($) shares	Sep. 30, 2021 USD ($) shares	Sep. 22, 2021 $ / shares	Dec. 31, 2020 USD ($) shares
Other Investments
Proceeds from Sale and Maturity of Marketable Securities			$ 5,788
Other investments, at fair value				$ 334		$ 293
Midas Gold Shares [Member]
Other Investments
Number Marketable Securities Sold | shares		4,667,615	6,882,115
Proceeds from Sale and Maturity of Marketable Securities		$ 4,835	$ 5,788
Marketable Securities, Realized Gain (Loss)		$ 2,454	$ 2,574
Nusantara Resources
Other Investments
Shares owned | shares				1,333,334		1,333,334
Nusantara Resources
Other Investments
Sale of Stock, Price Per Share | $ / shares					$ 0.35
Subsequent Event [Member] | Nusantara Resources
Other Investments
Proceeds from Sale and Maturity of Marketable Securities	$ 339

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

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