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MARKETABLE SECURITIES (Tables) | 9 Months Ended
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Sep. 30, 2023
Cash and Cash Equivalents [Abstract] |
Marketable Securities | The following table summarizes our marketable securities by significant investment categories as of September 30, 2023:
| Cost Basis | Gross Unrealized Losses | Gross Unrealized Gains | Fair Value
Marketable debt securities(1) | $ | 68,981 |  | $ | — |  | $ | 437 |  | $ | 69,418 |
Convertible note(2) | 39,638 |  | — |  | 6,972 |  | 46,610 |
Marketable equity securities | 2,876 |  | (1,671) |  | — |  | 1,205 |
Total marketable securities | $ | 111,495 |  | $ | (1,671) |  | $ | 7,409 |  | $ | 117,233 |
(1) Marketable debt securities are comprised primarily of U.S. Treasury Bills and Government Agency Bonds and mutual funds. (2) The Convertible Note was received as partial consideration in the Alta Mesa Transaction (defined in Note 5 – Property, Plant and Equipment and Mineral Properties) and is valued using a binomial lattice model using Level 3 inputs. As of September 30, 2023, the enCore share price was above the Conversion Option (defined below) resulting in an unrealized gain. During the three and nine months ended September 30, 2023, enCore redeemed $20.00 million of the principal amount of the Convertible Note. See Note 5 – Property, Plant and Equipment and Mineral Properties and Note 13 – Fair Value Accounting for more information. The following table summarizes our marketable securities by significant investment categories as of December 31, 2022:
| Cost Basis | Gross Unrealized Losses | Gross Unrealized Gains | Fair Value
Marketable debt securities(1) | $ | 11,435 |  | $ | (310) |  | $ | — |  | $ | 11,125 |
Marketable equity securities | 2,876 |  | (1,809) |  | — |  | 1,067 |
Total marketable securities | $ | 14,311 |  | $ | (2,119) |  | $ | — |  | $ | 12,192 |
(1) Marketable debt securities are comprised primarily of U.S. government agency bonds.

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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