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Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands		Mar. 31, 2025	Dec. 31, 2024
Fair Value, Recurring [Member]
Assets:
Cash equivalents		$ 90,896	$ 48,336
Total		176,945	134,462
Cash equivalents		90,896	48,336
Non-recurring fair value measurements:
Cash equivalents		90,896	48,336
Fair Value, Recurring [Member] | U.S. treasuries [Member]
Assets:
Financial instruments owned, at fair value		5,647	5,251
Financial instruments owned, at fair value		5,647	5,251
Financial instruments owned, at fair value:
Financial instruments owned, at fair value		5,647	5,251
Fair Value, Recurring [Member] | Equities [Member]
Assets:
Financial instruments owned, at fair value		8,023	8,478
Financial instruments owned, at fair value		8,023	8,478
Financial instruments owned, at fair value:
Financial instruments owned, at fair value		8,023	8,478
Fair Value, Recurring [Member] | Fixed income [Member]
Assets:
Financial instruments owned, at fair value		1,946	1,905
Financial instruments owned, at fair value		1,946	1,905
Financial instruments owned, at fair value:
Financial instruments owned, at fair value		1,946	1,905
Fair Value, Recurring [Member] | Level 1 [Member]
Assets:
Cash equivalents		90,896	48,336
Total		162,918	120,740
Cash equivalents		90,896	48,336
Non-recurring fair value measurements:
Cash equivalents		90,896	48,336
Fair Value, Recurring [Member] | Level 1 [Member] | U.S. treasuries [Member]
Assets:
Financial instruments owned, at fair value
Financial instruments owned, at fair value
Financial instruments owned, at fair value:
Financial instruments owned, at fair value
Fair Value, Recurring [Member] | Level 1 [Member] | Equities [Member]
Assets:
Financial instruments owned, at fair value		8,023	8,478
Financial instruments owned, at fair value		8,023	8,478
Financial instruments owned, at fair value:
Financial instruments owned, at fair value		8,023	8,478
Fair Value, Recurring [Member] | Level 1 [Member] | Fixed income [Member]
Assets:
Financial instruments owned, at fair value		1,025	1,019
Financial instruments owned, at fair value		1,025	1,019
Financial instruments owned, at fair value:
Financial instruments owned, at fair value		1,025	1,019
Fair Value, Recurring [Member] | Level 2 [Member]
Assets:
Cash equivalents
Total		13,272	13,035
Cash equivalents
Non-recurring fair value measurements:
Cash equivalents
Fair Value, Recurring [Member] | Level 2 [Member] | U.S. treasuries [Member]
Assets:
Financial instruments owned, at fair value		5,647	5,251
Financial instruments owned, at fair value		5,647	5,251
Financial instruments owned, at fair value:
Financial instruments owned, at fair value		5,647	5,251
Fair Value, Recurring [Member] | Level 2 [Member] | Equities [Member]
Assets:
Financial instruments owned, at fair value
Financial instruments owned, at fair value
Financial instruments owned, at fair value:
Financial instruments owned, at fair value
Fair Value, Recurring [Member] | Level 2 [Member] | Fixed income [Member]
Assets:
Financial instruments owned, at fair value		921	886
Financial instruments owned, at fair value		921	886
Financial instruments owned, at fair value:
Financial instruments owned, at fair value		921	886
Fair Value, Recurring [Member] | Level 3 [Member]
Assets:
Cash equivalents
Total		755	687
Cash equivalents
Non-recurring fair value measurements:
Cash equivalents
Fair Value, Recurring [Member] | Level 3 [Member] | U.S. treasuries [Member]
Assets:
Financial instruments owned, at fair value
Financial instruments owned, at fair value
Financial instruments owned, at fair value:
Financial instruments owned, at fair value
Fair Value, Recurring [Member] | Level 3 [Member] | Equities [Member]
Assets:
Financial instruments owned, at fair value
Financial instruments owned, at fair value
Financial instruments owned, at fair value:
Financial instruments owned, at fair value
Fair Value, Recurring [Member] | Level 3 [Member] | Fixed income [Member]
Assets:
Financial instruments owned, at fair value
Financial instruments owned, at fair value
Financial instruments owned, at fair value:
Financial instruments owned, at fair value
Fair Value, Recurring [Member] | ETFs [Member]
Assets:
Financial instruments owned, at fair value		62,974
Financial instruments owned, at fair value		62,974
Financial instruments owned, at fair value:
Financial instruments owned, at fair value		62,974
Fair Value, Recurring [Member] | ETFs [Member] | Level 1 [Member]
Assets:
Financial instruments owned, at fair value		62,974
Financial instruments owned, at fair value		62,974
Financial instruments owned, at fair value:
Financial instruments owned, at fair value		62,974
Fair Value, Recurring [Member] | ETFs [Member] | Level 2 [Member]
Assets:
Financial instruments owned, at fair value
Financial instruments owned, at fair value
Financial instruments owned, at fair value:
Financial instruments owned, at fair value
Fair Value, Recurring [Member] | ETFs [Member] | Level 3 [Member]
Assets:
Financial instruments owned, at fair value
Financial instruments owned, at fair value
Financial instruments owned, at fair value:
Financial instruments owned, at fair value
Fair Value, Recurring [Member] | Pass-through GSEs [Member]
Assets:
Financial instruments owned, at fair value		6,704	6,898
Financial instruments owned, at fair value		6,704	6,898
Financial instruments owned, at fair value:
Financial instruments owned, at fair value		6,704	6,898
Fair Value, Recurring [Member] | Pass-through GSEs [Member] | Level 1 [Member]
Assets:
Financial instruments owned, at fair value
Financial instruments owned, at fair value
Financial instruments owned, at fair value:
Financial instruments owned, at fair value
Fair Value, Recurring [Member] | Pass-through GSEs [Member] | Level 2 [Member]
Assets:
Financial instruments owned, at fair value		6,704	6,898
Financial instruments owned, at fair value		6,704	6,898
Financial instruments owned, at fair value:
Financial instruments owned, at fair value		6,704	6,898
Fair Value, Recurring [Member] | Pass-through GSEs [Member] | Level 3 [Member]
Assets:
Financial instruments owned, at fair value
Financial instruments owned, at fair value
Financial instruments owned, at fair value:
Financial instruments owned, at fair value
Fair Value, Recurring [Member] | ETFs [Member]
Assets:
Financial instruments owned, at fair value			62,907
Financial instruments owned, at fair value			62,907
Financial instruments owned, at fair value:
Financial instruments owned, at fair value			62,907
Fair Value, Recurring [Member] | ETFs [Member] | Level 1 [Member]
Assets:
Financial instruments owned, at fair value			62,907
Financial instruments owned, at fair value			62,907
Financial instruments owned, at fair value:
Financial instruments owned, at fair value			62,907
Fair Value, Recurring [Member] | ETFs [Member] | Level 2 [Member]
Assets:
Financial instruments owned, at fair value
Financial instruments owned, at fair value
Financial instruments owned, at fair value:
Financial instruments owned, at fair value
Fair Value, Recurring [Member] | ETFs [Member] | Level 3 [Member]
Assets:
Financial instruments owned, at fair value
Financial instruments owned, at fair value
Financial instruments owned, at fair value:
Financial instruments owned, at fair value
Other Investments [Member] | Fair Value, Recurring [Member]
Assets:
Financial instruments owned, at fair value		755	687
Financial instruments owned, at fair value		755	687
Financial instruments owned, at fair value:
Financial instruments owned, at fair value		755	687
Other Investments [Member] | Fair Value, Recurring [Member] | Level 1 [Member]
Assets:
Financial instruments owned, at fair value
Financial instruments owned, at fair value
Financial instruments owned, at fair value:
Financial instruments owned, at fair value
Other Investments [Member] | Fair Value, Recurring [Member] | Level 2 [Member]
Assets:
Financial instruments owned, at fair value
Financial instruments owned, at fair value
Financial instruments owned, at fair value:
Financial instruments owned, at fair value
Other Investments [Member] | Fair Value, Recurring [Member] | Level 3 [Member]
Assets:
Financial instruments owned, at fair value		755	687
Financial instruments owned, at fair value		755	687
Financial instruments owned, at fair value:
Financial instruments owned, at fair value		$ 755	687
Fnality International Limited—Series B-1 Preference Shares [Member] | Fair Value, Nonrecurring [Member]
Assets:
Fnality International Limited—Series B-1 Preference Shares(1)	[1]		8,288
Fnality International Limited—Series B-1 Preference Shares(1)	[1]		8,288
Non-recurring fair value measurements:
Fnality International Limited—Series B-1 Preference Shares(1)	[1]		8,288
Fnality International Limited—Series B-1 Preference Shares [Member] | Fair Value, Nonrecurring [Member] | Level 1 [Member]
Assets:
Fnality International Limited—Series B-1 Preference Shares(1)	[1]
Fnality International Limited—Series B-1 Preference Shares(1)	[1]
Non-recurring fair value measurements:
Fnality International Limited—Series B-1 Preference Shares(1)	[1]
Fnality International Limited—Series B-1 Preference Shares [Member] | Fair Value, Nonrecurring [Member] | Level 2 [Member]
Assets:
Fnality International Limited—Series B-1 Preference Shares(1)	[1]
Fnality International Limited—Series B-1 Preference Shares(1)	[1]
Non-recurring fair value measurements:
Fnality International Limited—Series B-1 Preference Shares(1)	[1]
Fnality International Limited—Series B-1 Preference Shares [Member] | Fair Value, Nonrecurring [Member] | Level 3 [Member]
Assets:
Fnality International Limited—Series B-1 Preference Shares(1)	[1]		8,288
Fnality International Limited—Series B-1 Preference Shares(1)	[1]		8,288
Non-recurring fair value measurements:
Fnality International Limited—Series B-1 Preference Shares(1)	[1]		$ 8,288
[1] 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.

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