Revenue - Schedule of Commission Revenue by Segment (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Total revenue	$ 33,566	$ 60,782	$ 121,584	$ 173,901
Basic (in dollars per share)	$ (1.18)	$ (0.98)	$ (1.77)	$ (1.32)
Diluted (in dollars per share)	$ (1.18)	$ (0.98)	$ (1.77)	$ (1.32)
Commission
Disaggregation of Revenue [Line Items]
Total revenue	$ 29,804	$ 54,731	$ 109,611	$ 153,677
Commission \| Medicare
Disaggregation of Revenue [Line Items]
Total revenue	28,228	52,237	101,456	141,956
Commission \| Employer and Individual
Disaggregation of Revenue [Line Items]
Total revenue	1,576	2,494	8,155	11,721
Commission revenue from members approved during the period
Disaggregation of Revenue [Line Items]
Total revenue	20,484	35,068	89,489	120,680
Commission revenue from members approved during the period \| Medicare
Disaggregation of Revenue [Line Items]
Total revenue	19,141	33,148	85,579	114,902
Commission revenue from members approved during the period \| Employer and Individual
Disaggregation of Revenue [Line Items]
Total revenue	1,343	1,920	3,910	5,778
Commission revenue from renewals of small business members during the period
Disaggregation of Revenue [Line Items]
Total revenue	1,713	1,892	4,484	4,742
Commission revenue from renewals of small business members during the period \| Medicare
Disaggregation of Revenue [Line Items]
Total revenue			0
Commission revenue from renewals of small business members during the period \| Employer and Individual
Disaggregation of Revenue [Line Items]
Total revenue	1,713	1,892	4,484	4,742
Net commission revenue from members approved in prior periods
Disaggregation of Revenue [Line Items]
Total revenue	$ 7,607	$ 17,771	$ 15,638	$ 28,255
Basic (in dollars per share)	$ 0.18	$ 0.44	$ 0.38	$ 0.71
Diluted (in dollars per share)	$ 0.18	$ 0.44	$ 0.38	$ 0.71
Net commission revenue from members approved in prior periods \| Medicare
Disaggregation of Revenue [Line Items]
Total revenue	$ 9,087	$ 19,089	$ 15,877	$ 27,054
Net commission revenue from members approved in prior periods \| Employer and Individual
Disaggregation of Revenue [Line Items]
Total revenue	$ (1,480)	$ (1,318)	$ (239)	$ 1,201