Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands		3 Months Ended		6 Months Ended
	Apr. 14, 2025	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) segment	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Accounting Policies [Line Items]
Stock split ratio	0.0666
Assets under custody		$ 18,100,000		$ 18,100,000		$ 16,900,000
Custodial client cash		440,300		$ 440,300		$ 482,900
Number of operating segments | segment				1
Goodwill impairment		0	$ 0	$ 0	$ 0
Total revenues		27,739	22,282	53,035	41,524
Non-US
Accounting Policies [Line Items]
Total revenues		$ 2,100	$ 1,800	$ 4,300	$ 3,300