Income Taxes - Valuation allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Valuation allowance for deferred tax assets
Valuation allowance as of beginning of year	$ 259,448	$ 216,061	$ 54,224
Increases recorded to Purchase Accounting and Net Investment from Former Parent	21,538	0	50,905
Increases recorded to income tax provision	22,745	43,387	110,932
Valuation allowance as of end of year	$ 303,731	$ 259,448	$ 216,061