Segment Reporting and Disaggregated Revenue - Segment Information, by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Earned premium, net	$ 239,642	$ 169,355
Revenues	61,093	148,392
Marketplace revenue	25,652	29,086
Net investment income	10,263	9,058
Net investment losses	(2,289)	(315)
Total revenue	311,830	328,336
Losses and loss adjustment expenses, net	97,919	71,130
Policy acquisition costs, net	101,922	77,333
Underwriting and other insurance expenses	59,588	1,357
Selling, general, and administrative expenses	72,138	143,780
Interest expense and other, net	(173)	296
Total segment expenses	(331,394)	(293,896)
Segment income (loss) before taxes	(19,564)	34,440
Interest expense	(1,095)	(1,393)
(Loss) Income Before Taxes	(20,937)	32,782
Segment Reporting, Reconciling Item, Corporate Nonsegment
Segment Reporting Information [Line Items]
Total segment expenses	(278)	(265)
Insurance
Segment Reporting Information [Line Items]
Earned premium, net	239,642	169,355
Revenues	38,562	121,152
Net investment income	10,014	8,883
Net investment losses	(2,289)	(315)
Total revenue	285,929	299,075
Insurance | Operating Segments
Segment Reporting Information [Line Items]
Earned premium, net	239,642	169,355
Marketplace revenue	0	0
Net investment income	10,014	8,883
Net investment losses	(2,289)	(315)
Total revenue	285,929	299,075
Losses and loss adjustment expenses, net	97,919	71,130
Policy acquisition costs, net	101,922	77,333
Underwriting and other insurance expenses	59,588	1,357
Selling, general, and administrative expenses	46,866	115,941
Interest expense and other, net	(16)	412
Total segment expenses	(306,279)	(266,173)
Segment income (loss) before taxes	(20,350)	32,902
Marketplace
Segment Reporting Information [Line Items]
Earned premium, net	0	0
Revenues	22,531	27,240
Net investment income	249	175
Net investment losses	0	0
Total revenue	25,901	29,261
Marketplace | Operating Segments
Segment Reporting Information [Line Items]
Earned premium, net	0	0
Marketplace revenue	25,652	29,086
Net investment income	249	175
Net investment losses	0	0
Total revenue	25,901	29,261
Losses and loss adjustment expenses, net	0	0
Policy acquisition costs, net	0	0
Underwriting and other insurance expenses	0	0
Selling, general, and administrative expenses	25,272	27,839
Interest expense and other, net	(157)	(116)
Total segment expenses	(25,115)	(27,723)
Segment income (loss) before taxes	786	1,538
Total commission and fee revenue
Segment Reporting Information [Line Items]
Revenues	16,435	100,287
Total commission and fee revenue | Insurance | Operating Segments
Segment Reporting Information [Line Items]
Revenues	16,435	100,287
Total commission and fee revenue | Marketplace | Operating Segments
Segment Reporting Information [Line Items]
Revenues	0	0
Membership and other revenue
Segment Reporting Information [Line Items]
Revenues	22,127	20,865
Membership and other revenue | Insurance | Operating Segments
Segment Reporting Information [Line Items]
Revenues	22,127	20,865
Membership and other revenue | Marketplace | Operating Segments
Segment Reporting Information [Line Items]
Revenues	$ 0	$ 0