The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. (v) Costs of drilling exploratory-type stratigraphic test wells.

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LIQUIDITY (Details) - USD ($) $ in Thousands			1 Months Ended		12 Months Ended
LIQUIDITY (Details) - USD ($) $ in Thousands	Feb. 11, 2021	Feb. 11, 2021	Jan. 31, 2021	Aug. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Estimated capital expenditures to construct the commercial plant					$ 120,000
Lithium mineral leases eliminated				$ 200
Cash balances					50,315	$ 1,870
Asset retirement obligations					5,239	6,300	$ 6,203
Exploration and evaluation costs, amounts spent					34	320
Proceeds from Issuance of Common Stock					63,614	$ 6,652
Subsequent Event
Cash balances	$ 101,000	$ 101,000
Proceeds from Issuance of Common Stock		$ 53,900
Cantor \| Controlled Equity Offering Sales Agreement \| Subsequent Event
Number of common stock issued			9,300,000
Proceeds from Issuance of Common Stock			$ 47,300
Lincoln Park \| December 2020 PA \| Subsequent Event
Number of common stock issued	900,000
Proceeds from Issuance of Common Stock	$ 6,600
enCore
Elimination of bonding liability					9,300
Elimination of asset retirement obligations					5,200
Annual expenditures related to reclamation and compliance costs					4,000
Common stock received and royalty interest retained					$ 1,800