Related Party Transactions - Kontora Earn-out Consideration (Details) - USD ($)		3 Months Ended	9 Months Ended	12 Months Ended
	Apr. 30, 2025	Sep. 30, 2025	Sep. 30, 2025	Dec. 31, 2024	Dec. 31, 2023
Related Party Transaction [Line Items]
Earn-out liabilities, at fair value		$ 50,745,000	$ 50,745,000	$ 64,639,000
Fair value of the business combination earn-out liability		63,162,000	63,162,000	77,957,000	$ 76,677,000
Net (gains) losses			10,198,000	34,465,000
Kontora Family Office GmbH ("Kontora")
Related Party Transaction [Line Items]
Total purchase consideration transferred	$ 15,696,000
Earn-out liabilities, at fair value	$ 5,743,000
Kontora Family Office GmbH ("Kontora") | Earn-out liability
Related Party Transaction [Line Items]
Fair value of the business combination earn-out liability		6,789,000	6,789,000	$ 0
Net (gains) losses		$ (561,000)	$ (1,046,000)
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Gain (loss) on earnout liabilities