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Fair Value Measurements (Details) - Schedule of Assets and Liabilities Measured at Fair Value - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Recurring [Member] |  |  |  |
Recurring fair value measurements: |  |  |  |
Cash equivalents |  | $ 329 | $ 930 |
Investments in Convertible Notes (Note 7): |  |  |  |
Total |  | 115,847 | 148,590 |
Recurring fair value measurements: |  |  |  |
Deferred consideration—gold payments (Note 9) |  |  | 200,290 |
Fair Value, Recurring [Member] | Securrency Convertible Note [Member] |  |  |  |
Investments in Convertible Notes (Note 7): |  |  |  |
Investments in Convertible Notes |  | 16,190 | 14,500 |
Fair Value, Recurring [Member] | Securrency convertible secured note [Member] |  |  |  |
Investments in Convertible Notes (Note 7): |  |  |  |
Investments in Convertible Notes |  | 12,925 |  |
Fair Value, Recurring [Member] | Exchange Traded Funds [Member] |  |  |  |
Financial instruments owned, at fair value: |  |  |  |
Financial instruments owned, at fair value |  | 42,382 | 23,772 |
Fair Value, Recurring [Member] | Federal Agency [Member] |  |  |  |
Financial instruments owned, at fair value: |  |  |  |
Financial instruments owned, at fair value |  | 24,419 | 96,837 |
Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |  |  |
Financial instruments owned, at fair value: |  |  |  |
Financial instruments owned, at fair value |  |  | 2,980 |
Fair Value, Recurring [Member] | Corporate bonds [Member] |  |  |  |
Financial instruments owned, at fair value: |  |  |  |
Financial instruments owned, at fair value |  |  | 885 |
Fair Value, Recurring [Member] | WisdomTree Digital Funds [Member] |  |  |  |
Other assets—seed capital (WisdomTree Digital Funds): |  |  |  |
Other assets |  |  | 1,765 |
Fair Value, Recurring [Member] | Level 1 [Member] |  |  |  |
Recurring fair value measurements: |  |  |  |
Cash equivalents |  | 329 | 930 |
Investments in Convertible Notes (Note 7): |  |  |  |
Total |  | 52,967 | 50,972 |
Recurring fair value measurements: |  |  |  |
Deferred consideration—gold payments (Note 9) |  |  |  |
Fair Value, Recurring [Member] | Level 1 [Member] | Securrency Convertible Note [Member] |  |  |  |
Investments in Convertible Notes (Note 7): |  |  |  |
Investments in Convertible Notes |  |  |  |
Fair Value, Recurring [Member] | Level 1 [Member] | Securrency convertible secured note [Member] |  |  |  |
Investments in Convertible Notes (Note 7): |  |  |  |
Investments in Convertible Notes |  |  |  |
Fair Value, Recurring [Member] | Level 1 [Member] | Exchange Traded Funds [Member] |  |  |  |
Financial instruments owned, at fair value: |  |  |  |
Financial instruments owned, at fair value |  | 42,382 | 23,772 |
Fair Value, Recurring [Member] | Level 1 [Member] | Federal Agency [Member] |  |  |  |
Financial instruments owned, at fair value: |  |  |  |
Financial instruments owned, at fair value |  |  | 23,290 |
Fair Value, Recurring [Member] | Level 1 [Member] | US Treasury Securities [Member] |  |  |  |
Financial instruments owned, at fair value: |  |  |  |
Financial instruments owned, at fair value |  |  | 2,980 |
Fair Value, Recurring [Member] | Level 1 [Member] | Corporate bonds [Member] |  |  |  |
Financial instruments owned, at fair value: |  |  |  |
Financial instruments owned, at fair value |  |  |  |
Fair Value, Recurring [Member] | Level 1 [Member] | WisdomTree Digital Funds [Member] |  |  |  |
Other assets—seed capital (WisdomTree Digital Funds): |  |  |  |
Other assets |  |  |  |
Fair Value, Recurring [Member] | Level 2 [Member] |  |  |  |
Recurring fair value measurements: |  |  |  |
Cash equivalents |  |  |  |
Investments in Convertible Notes (Note 7): |  |  |  |
Total |  | 26,312 | 76,197 |
Recurring fair value measurements: |  |  |  |
Deferred consideration—gold payments (Note 9) |  |  |  |
Fair Value, Recurring [Member] | Level 2 [Member] | Securrency Convertible Note [Member] |  |  |  |
Investments in Convertible Notes (Note 7): |  |  |  |
Investments in Convertible Notes |  |  |  |
Fair Value, Recurring [Member] | Level 2 [Member] | Securrency convertible secured note [Member] |  |  |  |
Investments in Convertible Notes (Note 7): |  |  |  |
Investments in Convertible Notes |  |  |  |
Fair Value, Recurring [Member] | Level 2 [Member] | Exchange Traded Funds [Member] |  |  |  |
Financial instruments owned, at fair value: |  |  |  |
Financial instruments owned, at fair value |  |  |  |
Fair Value, Recurring [Member] | Level 2 [Member] | Federal Agency [Member] |  |  |  |
Financial instruments owned, at fair value: |  |  |  |
Financial instruments owned, at fair value |  | 24,419 | 73,547 |
Fair Value, Recurring [Member] | Level 2 [Member] | US Treasury Securities [Member] |  |  |  |
Financial instruments owned, at fair value: |  |  |  |
Financial instruments owned, at fair value |  |  |  |
Fair Value, Recurring [Member] | Level 2 [Member] | Corporate bonds [Member] |  |  |  |
Financial instruments owned, at fair value: |  |  |  |
Financial instruments owned, at fair value |  |  | 885 |
Fair Value, Recurring [Member] | Level 2 [Member] | WisdomTree Digital Funds [Member] |  |  |  |
Other assets—seed capital (WisdomTree Digital Funds): |  |  |  |
Other assets |  |  | 1,765 |
Fair Value, Recurring [Member] | Level 3 [Member] |  |  |  |
Recurring fair value measurements: |  |  |  |
Cash equivalents |  |  |  |
Investments in Convertible Notes (Note 7): |  |  |  |
Total |  | 36,568 | 21,421 |
Recurring fair value measurements: |  |  |  |
Deferred consideration—gold payments (Note 9) |  |  | 200,290 |
Fair Value, Recurring [Member] | Level 3 [Member] | Securrency Convertible Note [Member] |  |  |  |
Investments in Convertible Notes (Note 7): |  |  |  |
Investments in Convertible Notes |  | 16,190 | 14,500 |
Fair Value, Recurring [Member] | Level 3 [Member] | Securrency convertible secured note [Member] |  |  |  |
Investments in Convertible Notes (Note 7): |  |  |  |
Investments in Convertible Notes |  | 12,925 |  |
Fair Value, Recurring [Member] | Level 3 [Member] | Exchange Traded Funds [Member] |  |  |  |
Financial instruments owned, at fair value: |  |  |  |
Financial instruments owned, at fair value |  |  |  |
Fair Value, Recurring [Member] | Level 3 [Member] | Federal Agency [Member] |  |  |  |
Financial instruments owned, at fair value: |  |  |  |
Financial instruments owned, at fair value |  |  |  |
Fair Value, Recurring [Member] | Level 3 [Member] | US Treasury Securities [Member] |  |  |  |
Financial instruments owned, at fair value: |  |  |  |
Financial instruments owned, at fair value |  |  |  |
Fair Value, Recurring [Member] | Level 3 [Member] | Corporate bonds [Member] |  |  |  |
Financial instruments owned, at fair value: |  |  |  |
Financial instruments owned, at fair value |  |  |  |
Fair Value, Recurring [Member] | Level 3 [Member] | WisdomTree Digital Funds [Member] |  |  |  |
Other assets—seed capital (WisdomTree Digital Funds): |  |  |  |
Other assets |  |  |  |
Fair Value, Recurring [Member] | Fnality Convertible Note [Member] |  |  |  |
Investments in Convertible Notes (Note 7): |  |  |  |
Investments in Convertible Notes |  | 7,453 | 6,921 |
Fair Value, Recurring [Member] | Fnality Convertible Note [Member] | Level 1 [Member] |  |  |  |
Investments in Convertible Notes (Note 7): |  |  |  |
Investments in Convertible Notes |  |  |  |
Fair Value, Recurring [Member] | Fnality Convertible Note [Member] | Level 2 [Member] |  |  |  |
Investments in Convertible Notes (Note 7): |  |  |  |
Investments in Convertible Notes |  |  |  |
Fair Value, Recurring [Member] | Fnality Convertible Note [Member] | Level 3 [Member] |  |  |  |
Investments in Convertible Notes (Note 7): |  |  |  |
Investments in Convertible Notes |  | 7,453 | 6,921 |
Fair Value, Nonrecurring [Member] |  |  |  |
Investments in Convertible Notes (Note 7): |  |  |  |
Total |  | 305 |  |
Fair Value, Nonrecurring [Member] | Other Investments [Member] |  |  |  |
Non-recurring fair value measurements: |  |  |  |
Non-recurring fair value measurements |  |  | 312 | [1]
Fair Value, Nonrecurring [Member] | Level 1 [Member] |  |  |  |
Investments in Convertible Notes (Note 7): |  |  |  |
Total |  |  |  |
Fair Value, Nonrecurring [Member] | Level 1 [Member] | Other Investments [Member] |  |  |  |
Non-recurring fair value measurements: |  |  |  |
Non-recurring fair value measurements |  |  |  | [1]
Fair Value, Nonrecurring [Member] | Level 2 [Member] |  |  |  |
Investments in Convertible Notes (Note 7): |  |  |  |
Total |  |  |  |
Fair Value, Nonrecurring [Member] | Level 2 [Member] | Other Investments [Member] |  |  |  |
Non-recurring fair value measurements: |  |  |  |
Non-recurring fair value measurements |  |  |  | [1]
Fair Value, Nonrecurring [Member] | Level 3 [Member] |  |  |  |
Investments in Convertible Notes (Note 7): |  |  |  |
Total |  | 305 |  |
Fair Value, Nonrecurring [Member] | Level 3 [Member] | Other Investments [Member] |  |  |  |
Non-recurring fair value measurements: |  |  |  |
Non-recurring fair value measurements |  |  | $ 312 | [1]
Fair Value, Nonrecurring [Member] | Securrency, Inc.—Series A convertible preferred stock [Member] |  |  |  |
Non-recurring fair value measurements: |  |  |  |
Non-recurring fair value measurements |  |  |  |
Fair Value, Nonrecurring [Member] | Securrency, Inc.—Series A convertible preferred stock [Member] | Level 1 [Member] |  |  |  |
Non-recurring fair value measurements: |  |  |  |
Non-recurring fair value measurements |  |  |  |
Fair Value, Nonrecurring [Member] | Securrency, Inc.—Series A convertible preferred stock [Member] | Level 2 [Member] |  |  |  |
Non-recurring fair value measurements: |  |  |  |
Non-recurring fair value measurements |  |  |  |
Fair Value, Nonrecurring [Member] | Securrency, Inc.—Series A convertible preferred stock [Member] | Level 3 [Member] |  |  |  |
Non-recurring fair value measurements: |  |  |  |
Non-recurring fair value measurements |  |  |  |
Fair Value, Nonrecurring [Member] | Securrency, Inc.—Series B convertible preferred stock [Member] |  |  |  |
Non-recurring fair value measurements: |  |  |  |
Non-recurring fair value measurements | [2] | 305 |  |
Fair Value, Nonrecurring [Member] | Securrency, Inc.—Series B convertible preferred stock [Member] | Level 1 [Member] |  |  |  |
Non-recurring fair value measurements: |  |  |  |
Non-recurring fair value measurements | [2] |  |  |
Fair Value, Nonrecurring [Member] | Securrency, Inc.—Series B convertible preferred stock [Member] | Level 2 [Member] |  |  |  |
Non-recurring fair value measurements: |  |  |  |
Non-recurring fair value measurements | [2] |  |  |
Fair Value, Nonrecurring [Member] | Securrency, Inc.—Series B convertible preferred stock [Member] | Level 3 [Member] |  |  |  |
Non-recurring fair value measurements: |  |  |  |
Non-recurring fair value measurements | [2] | 305 |  |
US Treasury Securities [Member] | Fair Value, Recurring [Member] |  |  |  |
Other assets—seed capital (WisdomTree Digital Funds): |  |  |  |
Other assets |  | 4,851 |  |
US Treasury Securities [Member] | Fair Value, Recurring [Member] | Level 1 [Member] |  |  |  |
Other assets—seed capital (WisdomTree Digital Funds): |  |  |  |
Other assets |  | 4,851 |  |
US Treasury Securities [Member] | Fair Value, Recurring [Member] | Level 2 [Member] |  |  |  |
Other assets—seed capital (WisdomTree Digital Funds): |  |  |  |
Other assets |  |  |  |
US Treasury Securities [Member] | Fair Value, Recurring [Member] | Level 3 [Member] |  |  |  |
Other assets—seed capital (WisdomTree Digital Funds): |  |  |  |
Other assets |  |  |  |
Equity Securities [Member] | Fair Value, Recurring [Member] |  |  |  |
Other assets—seed capital (WisdomTree Digital Funds): |  |  |  |
Other assets |  | 5,405 |  |
Equity Securities [Member] | Fair Value, Recurring [Member] | Level 1 [Member] |  |  |  |
Other assets—seed capital (WisdomTree Digital Funds): |  |  |  |
Other assets |  | 5,405 |  |
Equity Securities [Member] | Fair Value, Recurring [Member] | Level 2 [Member] |  |  |  |
Other assets—seed capital (WisdomTree Digital Funds): |  |  |  |
Other assets |  |  |  |
Equity Securities [Member] | Fair Value, Recurring [Member] | Level 3 [Member] |  |  |  |
Other assets—seed capital (WisdomTree Digital Funds): |  |  |  |
Other assets |  |  |  |
Fixed Income Investments [Member] | Fair Value, Recurring [Member] |  |  |  |
Other assets—seed capital (WisdomTree Digital Funds): |  |  |  |
Other assets |  | 1,893 |  |
Fixed Income Investments [Member] | Fair Value, Recurring [Member] | Level 1 [Member] |  |  |  |
Other assets—seed capital (WisdomTree Digital Funds): |  |  |  |
Other assets |  |  |  |
Fixed Income Investments [Member] | Fair Value, Recurring [Member] | Level 2 [Member] |  |  |  |
Other assets—seed capital (WisdomTree Digital Funds): |  |  |  |
Other assets |  | 1,893 |  |
Fixed Income Investments [Member] | Fair Value, Recurring [Member] | Level 3 [Member] |  |  |  |
Other assets—seed capital (WisdomTree Digital Funds): |  |  |  |
Other assets |  |  |  |
[1] | Fair value determined on May 10, 2022.
[2] | Fair value determined on September 30, 2023.

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