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Business and Summary of Significan Accounting Policies - Purchase Price Allocated to Assets and Liabilities Acquired (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Jul. 12, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash		$ 974
Other current assets		42
Equipment		100
Mineral property		15,611
Accounts payable		(492)
Asset retirement obligation – Lik		$ (125)
Total purchase price	$ 16,110

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Current portion of reclamation reserve to restore a mining or drilling site to the condition agreed upon within the mining or drilling contract.

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