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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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