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MARKETABLE SECURITIES (Tables) | 6 Months Ended
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Jun. 30, 2023
Cash and Cash Equivalents [Abstract] |
Marketable Securities | The following table summarizes our marketable securities by significant investment categories as of June 30, 2023:
| Cost Basis | Gross Unrealized Losses | Gross Unrealized Gains | Fair Value
Marketable debt securities(1) | $ | 63,019 |  | $ | — |  | $ | 212 |  | $ | 63,231 |
Convertible note(2) | 59,457 |  | (251) |  | — |  | 59,206 |
Marketable equity securities | 2,876 |  | (1,987) |  | — |  | 889 |
Total marketable securities | $ | 125,352 |  | $ | (2,238) |  | $ | 212 |  | $ | 123,326 |
(1) Marketable debt securities are comprised primarily of U.S. government agency bonds. (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. 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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