LIQUIDITY (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Aug. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Cash balances		$ 115,293	$ 50,315
Issuance of common stock, net		$ 84,142	63,614
Lithium mineral leases eliminated	$ 200
Cantor | Controlled Equity Offering Sales Agreement
Number of common stock issued		10,000,000.0
Issuance of common stock, net		$ 49,500
Lincoln Park | 2020 Lincoln Park PA
Number of common stock issued		6,100,000
Issuance of common stock, net		$ 34,600
Amount available for future sales		$ 47,700
Registered share available for future sales		9,700,252
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