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Fair Value Measurements (Details) - Schedule of Assets and Liabilities Measured at Fair Value - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Fair Value, Recurring [Member]    
Recurring fair value measurements:    
Cash equivalents $ 50,226 $ 930
Investments in Convertible Notes    
Total 108,948 148,590
Recurring fair value measurements:    
Deferred consideration (Note 9)   200,290
Fair Value, Recurring [Member] | Securrency, Inc.—convertible note [Member]    
Investments in Convertible Notes    
Investments in Convertible Notes   14,500
Fair Value, Recurring [Member] | ETFs [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value 35,181 23,772
Fair Value, Recurring [Member] | Pass-through GSEs [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value 10,240 96,837
Fair Value, Recurring [Member] | U.S. treasuries [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]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value   1,765
Fair Value, Recurring [Member] | Level 1 [Member]    
Recurring fair value measurements:    
Cash equivalents 50,226 930
Investments in Convertible Notes    
Total 92,752 50,972
Recurring fair value measurements:    
Deferred consideration (Note 9)  
Fair Value, Recurring [Member] | Level 1 [Member] | Securrency, Inc.—convertible note [Member]    
Investments in Convertible Notes    
Investments in Convertible Notes  
Fair Value, Recurring [Member] | Level 1 [Member] | ETFs [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value 35,181 23,772
Fair Value, Recurring [Member] | Level 1 [Member] | Pass-through GSEs [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value 23,290
Fair Value, Recurring [Member] | Level 1 [Member] | U.S. treasuries [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]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value  
Fair Value, Recurring [Member] | Level 2 [Member]    
Recurring fair value measurements:    
Cash equivalents
Investments in Convertible Notes    
Total 16,196 76,197
Recurring fair value measurements:    
Deferred consideration (Note 9)  
Fair Value, Recurring [Member] | Level 2 [Member] | Securrency, Inc.—convertible note [Member]    
Investments in Convertible Notes    
Investments in Convertible Notes  
Fair Value, Recurring [Member] | Level 2 [Member] | ETFs [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value
Fair Value, Recurring [Member] | Level 2 [Member] | Pass-through GSEs [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value 10,240 73,547
Fair Value, Recurring [Member] | Level 2 [Member] | U.S. treasuries [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]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value   1,765
Fair Value, Recurring [Member] | Level 3 [Member]    
Recurring fair value measurements:    
Cash equivalents
Investments in Convertible Notes    
Total 21,421
Recurring fair value measurements:    
Deferred consideration (Note 9)   200,290
Fair Value, Recurring [Member] | Level 3 [Member] | Securrency, Inc.—convertible note [Member]    
Investments in Convertible Notes    
Investments in Convertible Notes   14,500
Fair Value, Recurring [Member] | Level 3 [Member] | ETFs [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value
Fair Value, Recurring [Member] | Level 3 [Member] | Pass-through GSEs [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value
Fair Value, Recurring [Member] | Level 3 [Member] | U.S. treasuries [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]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value  
Fair Value, Recurring [Member] | Fnality International Limited—convertible note [Member]    
Investments in Convertible Notes    
Investments in Convertible Notes   6,921
Fair Value, Recurring [Member] | Fnality International Limited—convertible note [Member] | Level 1 [Member]    
Investments in Convertible Notes    
Investments in Convertible Notes  
Fair Value, Recurring [Member] | Fnality International Limited—convertible note [Member] | Level 2 [Member]    
Investments in Convertible Notes    
Investments in Convertible Notes  
Fair Value, Recurring [Member] | Fnality International Limited—convertible note [Member] | Level 3 [Member]    
Investments in Convertible Notes    
Investments in Convertible Notes   6,921
Fair Value, Nonrecurring [Member]    
Investments in Convertible Notes    
Total 9,684  
Fair Value, Nonrecurring [Member] | Fnality International Limited—B-1 Preference Shares [Member]    
Non-recurring fair value measurements:    
Non-recurring fair value measurements [1] 9,684  
Fair Value, Nonrecurring [Member] | Other Investments [Member]    
Non-recurring fair value measurements:    
Non-recurring fair value measurements [2] 312 [3]
Fair Value, Nonrecurring [Member] | Level 1 [Member]    
Investments in Convertible Notes    
Total  
Fair Value, Nonrecurring [Member] | Level 1 [Member] | Fnality International Limited—B-1 Preference Shares [Member]    
Non-recurring fair value measurements:    
Non-recurring fair value measurements [1]  
Fair Value, Nonrecurring [Member] | Level 1 [Member] | Other Investments [Member]    
Non-recurring fair value measurements:    
Non-recurring fair value measurements [2] [3]
Fair Value, Nonrecurring [Member] | Level 2 [Member]    
Investments in Convertible Notes    
Total  
Fair Value, Nonrecurring [Member] | Level 2 [Member] | Fnality International Limited—B-1 Preference Shares [Member]    
Non-recurring fair value measurements:    
Non-recurring fair value measurements [1]  
Fair Value, Nonrecurring [Member] | Level 2 [Member] | Other Investments [Member]    
Non-recurring fair value measurements:    
Non-recurring fair value measurements [2] [3]
Fair Value, Nonrecurring [Member] | Level 3 [Member]    
Investments in Convertible Notes    
Total 9,684  
Fair Value, Nonrecurring [Member] | Level 3 [Member] | Fnality International Limited—B-1 Preference Shares [Member]    
Non-recurring fair value measurements:    
Non-recurring fair value measurements [1] 9,684  
Fair Value, Nonrecurring [Member] | Level 3 [Member] | Other Investments [Member]    
Non-recurring fair value measurements:    
Non-recurring fair value measurements [2] $ 312 [3]
U.S. treasuries [Member] | Fair Value, Recurring [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value 5,007  
U.S. treasuries [Member] | Fair Value, Recurring [Member] | Level 2 [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value 5,007  
U.S. treasuries [Member] | Fair Value, Recurring [Member] | Level 3 [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value  
Equities [Member] | Fair Value, Recurring [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value 6,337  
Equities [Member] | Fair Value, Recurring [Member] | Level 1 [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value 6,337  
Equities [Member] | Fair Value, Recurring [Member] | Level 2 [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value  
Equities [Member] | Fair Value, Recurring [Member] | Level 3 [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value  
Fixed income [Member] | Fair Value, Recurring [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value 1,957  
Fixed income [Member] | Fair Value, Recurring [Member] | Level 1 [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value 1,008  
Fixed income [Member] | Fair Value, Recurring [Member] | Level 2 [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value 949  
Fixed income [Member] | Fair Value, Recurring [Member] | Level 3 [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value  
[1] Fair value determined on October 31, 2023
[2] Fair value determined on September 30, 2023
[3] Fair value determined on May 10, 2022