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LIQUIDITY (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Cash balances	$ 119,138	$ 119,138	$ 2,330	$ 50,315
Proceeds from issuance of common stock		$ 77,863	$ 6,291
Registered share available for future sales	0	0
Cantor | Controlled Equity Offering Sales Agreement
Number of common stock issued		9,300,000
Proceeds from issuance of common stock		$ 47,300
Lincoln Park | December 2020 PA
Number of common stock issued	1,200,000	5,000,000.0
Proceeds from issuance of common stock	$ 5,700	$ 30,600
Registered share available for future sales	10,800,000	10,800,000
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

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