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Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Fair Value, Recurring [Member]    
Recurring fair value measurements:    
Cash equivalents $ 48,336 $ 50,226
Other assets—seed capital (WisdomTree Digital Funds):    
Total 134,462 108,948
Fair Value, Recurring [Member] | Level 1 [Member]    
Recurring fair value measurements:    
Cash equivalents 48,336 50,226
Other assets—seed capital (WisdomTree Digital Funds):    
Total 120,740 92,752
Fair Value, Recurring [Member] | Level 2 [Member]    
Recurring fair value measurements:    
Cash equivalents
Other assets—seed capital (WisdomTree Digital Funds):    
Total 13,035 16,196
Fair Value, Recurring [Member] | Level 3 [Member]    
Recurring fair value measurements:    
Cash equivalents
Other assets—seed capital (WisdomTree Digital Funds):    
Total 687
Fair Value, Recurring [Member] | U.S. treasuries [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value 5,251 5,007
Fair Value, Recurring [Member] | U.S. treasuries [Member] | Level 1 [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value
Fair Value, Recurring [Member] | U.S. treasuries [Member] | Level 2 [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value 5,251 5,007
Fair Value, Recurring [Member] | U.S. treasuries [Member] | Level 3 [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value
Fair Value, Recurring [Member] | Equities [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value 8,478 6,337
Fair Value, Recurring [Member] | Equities [Member] | Level 1 [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value 8,478 6,337
Fair Value, Recurring [Member] | Equities [Member] | Level 2 [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value
Fair Value, Recurring [Member] | Equities [Member] | Level 3 [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value
Fair Value, Recurring [Member] | Fixed income [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value 1,905 1,957
Fair Value, Recurring [Member] | Fixed income [Member] | Level 1 [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value 1,019 1,008
Fair Value, Recurring [Member] | Fixed income [Member] | Level 2 [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value 886 949
Fair Value, Recurring [Member] | Fixed income [Member] | Level 3 [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value
Fair Value, Recurring [Member] | ETFs [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value 62,907  
Fair Value, Recurring [Member] | ETFs [Member] | Level 1 [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value 62,907  
Fair Value, Recurring [Member] | ETFs [Member] | Level 2 [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value  
Fair Value, Recurring [Member] | ETFs [Member] | Level 3 [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value  
Fair Value, Recurring [Member] | Pass-through GSEs [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value 6,898 10,240
Fair Value, Recurring [Member] | Pass-through GSEs [Member] | Level 1 [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value
Fair Value, Recurring [Member] | Pass-through GSEs [Member] | Level 2 [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value 6,898 10,240
Fair Value, Recurring [Member] | Pass-through GSEs [Member] | Level 3 [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value
Fair Value, Recurring [Member] | ETFs [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value   35,181
Fair Value, Recurring [Member] | ETFs [Member] | Level 1 [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value   35,181
Fair Value, Recurring [Member] | ETFs [Member] | Level 2 [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value  
Fair Value, Recurring [Member] | ETFs [Member] | Level 3 [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value  
Fair Value, Nonrecurring [Member]    
Other assets—seed capital (WisdomTree Digital Funds):    
Total   9,684
Fair Value, Nonrecurring [Member] | Level 1 [Member]    
Other assets—seed capital (WisdomTree Digital Funds):    
Total  
Fair Value, Nonrecurring [Member] | Level 2 [Member]    
Other assets—seed capital (WisdomTree Digital Funds):    
Total  
Fair Value, Nonrecurring [Member] | Level 3 [Member]    
Other assets—seed capital (WisdomTree Digital Funds):    
Total   9,684
Other investments [Member] | Fair Value, Recurring [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value 687  
Other investments [Member] | Fair Value, Recurring [Member] | Level 1 [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value  
Other investments [Member] | Fair Value, Recurring [Member] | Level 2 [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value  
Other investments [Member] | Fair Value, Recurring [Member] | Level 3 [Member]    
Financial instruments owned, at fair value:    
Financial instruments owned, at fair value 687  
Other investments [Member] | Fair Value, Nonrecurring [Member]    
Non-recurring fair value measurements:    
Non-recurring fair value measurements [1]  
Other investments [Member] | Fair Value, Nonrecurring [Member] | Level 1 [Member]    
Non-recurring fair value measurements:    
Non-recurring fair value measurements [1]  
Other investments [Member] | Fair Value, Nonrecurring [Member] | Level 2 [Member]    
Non-recurring fair value measurements:    
Non-recurring fair value measurements [1]  
Other investments [Member] | Fair Value, Nonrecurring [Member] | Level 3 [Member]    
Non-recurring fair value measurements:    
Non-recurring fair value measurements [1]  
Fnality International Limited—Series B-1 Preference Shares [Member] | Fair Value, Nonrecurring [Member]    
Non-recurring fair value measurements:    
Non-recurring fair value measurements 8,288 [2] 9,684 [3]
Fnality International Limited—Series B-1 Preference Shares [Member] | Fair Value, Nonrecurring [Member] | Level 1 [Member]    
Non-recurring fair value measurements:    
Non-recurring fair value measurements [2] [3]
Fnality International Limited—Series B-1 Preference Shares [Member] | Fair Value, Nonrecurring [Member] | Level 2 [Member]    
Non-recurring fair value measurements:    
Non-recurring fair value measurements [2] [3]
Fnality International Limited—Series B-1 Preference Shares [Member] | Fair Value, Nonrecurring [Member] | Level 3 [Member]    
Non-recurring fair value measurements:    
Non-recurring fair value measurements $ 8,288 [2] $ 9,684 [3]
[1] Fair value determined on September 30, 2023
[2] Fair value determined on June 17, 2024. Not included above are prospective changes in value due to fluctuations in the British pound to U.S. dollar exchange rate.
[3] Fair value determined on October 31, 2023