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FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - Assets and Liabilities (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 USD ($) | Dec. 31, 2023 $ / shares | Dec. 31, 2022 USD ($)
Assets: |  |  |
Cash and cash equivalents | $ 492,393 |  | $ 655,453
Restricted cash | 101 |  | 33,653
Marketable securities | 28,351 |  | 44,841
Trade receivables from provisional sales, net | 86,897 |  | 49,897
Deferred consideration | 21,213 |  | 24,369
Total assets | 628,955 |  | 808,213
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Contingent consideration | 29,648 |  |
Total liabilities | 31,079 |  |
EMX Common Share |  |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Option liability - EMX shares | $ 1,431 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Royalty Portfolio | EMX Common Share |  |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Share price (in canadian dollars per share) | $ / shares |  | $ 2.19 |
Exercise price (in canadian dollars per share) | $ / shares |  | $ 2.27 |
Expected life (years) | 1 year |  |
Risk free interest rate term (in years) | 1 year |  |
Risk-free interest rate (as a percent) | 4.80% |  |
Annualized volatility (as a percent) | 34.10% |  |
Level 1 |  |  |
Assets: |  |  |
Cash and cash equivalents | $ 492,393 |  | 655,453
Restricted cash | 101 |  | 33,653
Marketable securities | 28,351 |  | 44,841
Trade receivables from provisional sales, net | 0 |  | 0
Deferred consideration | 0 |  | 0
Total assets | 520,845 |  | 733,947
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Contingent consideration | 0 |  |
Total liabilities | 0 |  |
Level 1 | EMX Common Share |  |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Option liability - EMX shares | 0 |  |
Level 2 |  |  |
Assets: |  |  |
Cash and cash equivalents | 0 |  | 0
Restricted cash | 0 |  | 0
Marketable securities | 0 |  | 0
Trade receivables from provisional sales, net | 86,897 |  | 49,897
Deferred consideration | 0 |  | 0
Total assets | 86,897 |  | 49,897
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Contingent consideration | 0 |  |
Total liabilities | 1,431 |  |
Level 2 | EMX Common Share |  |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Option liability - EMX shares | 1,431 |  |
Level 3 |  |  |
Assets: |  |  |
Cash and cash equivalents | 0 |  | 0
Restricted cash | 0 |  | 0
Marketable securities | 0 |  | 0
Trade receivables from provisional sales, net | 0 |  | 0
Deferred consideration | 21,213 |  | 24,369
Total assets | 21,213 |  | $ 24,369
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Contingent consideration | 29,648 |  |
Total liabilities | 29,648 |  |
Level 3 | EMX Common Share |  |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Option liability - EMX shares | $ 0 |  |

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