Income Taxes - Deferred tax assets and liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Net operating loss carryforwards	$ 125,037	$ 73,364
Tax credit carryforwards	7,388	4,780
Unearned premium reserves	662	103
Discounting of unpaid losses	631	167
Stock compensation	2,487	501
Other	324	1,048
Total deferred tax assets	136,529	79,963
Deferred tax liabilities:
Depreciation & Amortization	(6,507)	(3,691)
Total deferred tax liabilities	(6,507)	(3,691)
Net deferred tax assets before valuation allowance	130,022	76,272
Less valuation allowance	$ (130,022)	(76,272)
Balance end of year		$ 0