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Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($) segment	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)
Concentration Risk [Line Items]
Number of operating segments \| segment			1
Number of reportable segments \| segment			1
Cash and cash equivalents segregated for the benefit of stablecoin holders - restricted \| $	$ 4,634,863	$ 2,207,411	$ 4,634,863	$ 2,207,411	$ 3,313,527
Money Market Funds
Concentration Risk [Line Items]
Cash equivalents \| $	$ 41,000		$ 41,000		$ 49,100
Customer Concentration Risk \| Revenue from Contract with Customer Benchmark \| Largest Customers
Concentration Risk [Line Items]
Concentration percentage	20.70%	20.00%	19.90%	12.00%
Customer Concentration Risk \| Accounts Receivable \| Customer One
Concentration Risk [Line Items]
Concentration percentage			36.40%		30.20%
Customer Concentration Risk \| Accounts Receivable \| Customer Two
Concentration Risk [Line Items]
Concentration percentage			15.90%		12.10%