Income Taxes - Significant deferred tax assets and deferred tax liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets
Accrued expenses	$ 1,070	$ 1,114
Stock-based compensation	1,753	2,469
Deferred revenue	37,108	2,036
Property and equipment		229
Intangibles		452
Goodwill	357	1,444
Operating lease liabilities	1,126
Loss and loss adjustment reserves	11,971
Other	10	8
Net operating losses	87,802	50,119
Disallowed interest	5,098	6,385
Valuation allowance	(88,613)	(63,317)
Total deferred tax assets	57,682	939
Deferred tax liabilities
Property and equipment	(50)
Intangibles	(10,660)
Operating lease right-of-use assets	(1,091)
Deferred acquisition costs	(857)
Reinsurance balance due	(44,197)
Internally developed software	(1,180)	(943)
Total deferred tax liabilities	(58,035)	(943)
Net deferred tax liabilities	$ (353)	$ (4)