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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.