Significant Accounting Policies - Revenue Recognition (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026 USD ($) customer	Jun. 30, 2025 USD ($) customer	Jun. 30, 2026 USD ($) customer	Jun. 30, 2025 USD ($) customer
Significant Accounting Policies
Revenue	$ 386,381	$ 355,788	$ 772,771	$ 729,013
Number of customers (customer) \| customer	4	4	4	5
Capitated revenue
Significant Accounting Policies
Revenue	$ 366,398	$ 351,724	$ 745,897	$ 721,241
Capitated revenue \| Revenue \| Product Concentration Risk
Significant Accounting Policies
Percentage of total revenue (as a percent)	94.80%	98.90%	96.50%	98.90%
Health Care, Other [Member]
Significant Accounting Policies
Revenue	$ 19,983	$ 4,064	$ 26,874	$ 7,772
Health Care, Other [Member] \| Revenue \| Product Concentration Risk
Significant Accounting Policies
Percentage of total revenue (as a percent)	5.20%	1.10%	3.50%	1.10%
Health Care Clinical Fees Insurance Revenue [Member]
Significant Accounting Policies
Revenue	$ 856	$ 808	$ 1,119	$ 1,800
Health Care Clinical Fees Insurance Revenue [Member] \| Revenue \| Product Concentration Risk
Significant Accounting Policies
Percentage of total revenue (as a percent)	0.20%	0.20%	0.10%	0.30%
Health Care Coordination Management Fees [Member]
Significant Accounting Policies
Revenue	$ 8,758	$ 2,667	$ 15,276	$ 5,362
Health Care Coordination Management Fees [Member] \| Revenue \| Product Concentration Risk
Significant Accounting Policies
Percentage of total revenue (as a percent)	2.30%	0.70%	2.00%	0.70%
Health Care Incentive Fees [Member]
Significant Accounting Policies
Revenue	$ 10,369	$ 589	$ 10,479	$ 610
Health Care Incentive Fees [Member] \| Revenue \| Product Concentration Risk
Significant Accounting Policies
Percentage of total revenue (as a percent)	2.70%	0.20%	1.40%	0.10%