Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2024
Operating loss and tax credit carryforwards
Valuation allowance, deferred tax asset, decrease	$ 177.9
State and local tax authority | California Franchise Tax Board
Operating loss and tax credit carryforwards
Operating loss carryforwards		$ 171.9
Tax credit carryforwards, alternative minimum tax credit		0.5
Research and development tax credit carryforward | Federal
Operating loss and tax credit carryforwards
Tax credit carryforwards		41.6
Research and development tax credit carryforward | State and local tax authority | California Franchise Tax Board
Operating loss and tax credit carryforwards
Tax credit carryforwards		30.0
Foreign tax credit
Operating loss and tax credit carryforwards
Tax credit carryforwards		$ 1.0