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MARKETABLE SECURITIES | 6 Months Ended
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Jun. 30, 2025
Cash and Cash Equivalents [Abstract] |
Marketable Securities | MARKETABLE SECURITIES The Company manages excess cash by investing in U.S. government notes, U.S. government agencies and tradeable certificates of deposits. The Company has elected the fair value option for these marketable debt securities and records these instruments on the Condensed Consolidated Balance Sheet at their fair value including interest income. Changes in fair value and interest income are recorded in Other income in the Condensed Consolidated Statements of Operations and Comprehensive Loss. After consideration of the Company’s risk versus reward objectives and its liquidity requirements, the Company elected the fair value option for its marketable debt securities because the Company may sell them prior to their stated maturities. The stated contractual maturity dates of marketable debt securities invested in U.S. government notes, U.S. government agencies and tradeable certificates of deposits held as of June 30, 2025 and December 31, 2024 are due within one year. On June 30, 2025, the Company entered into an amendment to the JV Agreements whereby the Company advanced AUD$13.00 million to the Donald Project JV for the acquisition of certain land and properties the (“Advance”). The Advance is secured by the land and properties acquired and does not bear interest unless of default. If a positive FID is made on the Donald Project, the Advance will be applied to the Company's earn-in interest in the Donald Project JV. If a positive FID is not made, the Advance shall become due and payable subject to the terms of the JV Agreement. As the Advance is convertible into equity, the Company accounts for the Advance as a marketable debt security for which it has elected the fair value option and changes in fair value are record in Other income in the Condensed Consolidated Statements of Operations and Comprehensive Loss. Marketable equity securities are measured at fair value as of each reporting date and realized and unrealized gains (losses) and interest income are recorded in Other income in the Condensed Consolidated Statements of Operations and Comprehensive Loss. The following table summarizes the Company’s marketable securities by investment categories:
| Cost Basis |  | Gross Unrealized Losses |  | Gross Unrealized Gains |  | Fair Value
June 30, 2025 |  |  |  |  |  |  |
Current |  |  |  |  |  |  |
Marketable debt securities(1) | $ | 109,476 |  |  | $ | — |  |  | $ | 457 |  |  | $ | 109,933 |
Marketable equity securities | 28,159 |  |  | (11,681) |  |  | — |  |  | 16,478 |
Total marketable securities | $ | 137,635 |  |  | $ | (11,681) |  |  | $ | 457 |  |  | $ | 126,411 |
Non-current |  |  |  |  |  |  |
Marketable debt securities | $ | 8,515 |  |  | $ | (522) |  |  | $ | — |  |  | $ | 7,993 |
December 31, 2024 |  |  |  |  |  |  |
Current |  |  |  |  |  |  |
Marketable debt securities(1) | $ | 63,590 |  |  | $ | — |  |  | $ | 475 |  |  | $ | 64,065 |
Marketable equity securities | 28,159 |  |  | (11,370) |  |  | — |  |  | 16,789 |
Total marketable securities | $ | 91,749 |  |  | $ | (11,370) |  |  | $ | 475 |  |  | $ | 80,854 |
(1) Marketable debt securities are comprised primarily of U.S. Treasury Bills and Government Agency Bonds.

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