Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Name:	us-gaap_RestrictedCashAndCashEquivalents
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

ORGANIZATION - Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Feb. 28, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash and cash equivalents		$ 37,698	$ 28,851
Total cash and cash equivalents		$ 37,698	$ 29,851	$ 20,634
Cripple Creek Project \| Subsequent Event
Restricted cash	$ 180,000
Total cash and cash equivalents	$ 232,000