Income Taxes - Schedule Of Deferred Tax Assets And Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Deferred Tax Assets:
Net operating loss carryforwards	$ 43.4	$ 22.4
Accrued expenses	1.5	0.7
Operating lease liabilities	3.3	1.2
Stock-based compensation	3.7	1.3
Warrants	2.5	2.0
Capitalized R&D expenses	51.7	14.9
Credits	21.1	6.1
Start-up costs	4.7	0.0
Other	0.9	0.1
Gross deferred tax assets	132.8	48.7
Less: valuation allowance	(129.7)	(47.1)
Deferred tax assets, net of valuation allowance	3.1	1.6
Deferred Tax Liabilities:
Depreciation and amortization	0.0	(0.3)
Right-of-use assets	(3.1)	(1.3)
Total deferred tax liabilities	(3.1)	(1.6)
Total net deferred tax assets	$ 0.0	$ 0.0