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INCOME TAXES - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets
Inventories	$ 7,051	$ 5,405
Short-term investments	209	209
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Classification [Abstract]
Operating loss carry forwards	95,060	88,156
Capital loss carry forwards	843	852
Deferred revenue and other	2,057	2,719
Mineral properties and deferred costs	26,554	27,541
Asset retirement obligations	3,455	5,028
Property, plant and equipment	1,806	1,644
Total deferred tax assets	137,035	131,554
Less: valuation allowance	(137,035)	(131,554)
Net deferred tax assets	$ 0	$ 0

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