Income Taxes - Significant deferred tax assets and deferred tax liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets
Accrued expenses and other	$ 3,721	$ 1,230
Unrealized gain/loss on investments	811	1,296
Stock-based compensation	2,638	1,626
Deferred revenue	27,599	49,053
Goodwill	9,217	6,378
Operating lease liabilities	793	1,071
Loss and loss adjustment reserves	2,479	16,392
Net operating losses	102,044	100,920
Disallowed interest	9,650	5,676
Research and development capitalized costs	169	521
Valuation allowance	(140,535)	(117,568)
Total deferred tax assets	18,586	66,595
Deferred tax liabilities
Property and equipment	(98)	(87)
Intangibles	(1,167)	(3,614)
Operating lease right-of-use assets	(774)	(1,026)
Deferred policy acquisition costs	(5,715)	(1,907)
Reinsurance balance due	(11,491)	(59,794)
Internally developed software	0	(590)
Total deferred tax liabilities	(19,245)	(67,018)
Net deferred tax liabilities	$ (659)	$ (423)