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LIQUIDITY (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
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 |  |

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