Property, Equipment and Leasehold Improvements - Schedule of Property, Equipment and Leasehold Improvements (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Property Plant And Equipment [Line Items]
Total property, equipment and leasehold improvements	$ 33.4	$ 32.6
Less: accumulated depreciation and amortization	(28.2)	(25.6)
Property, equipment and leasehold improvements, net	5.2	7.0
Laboratory equipment
Property Plant And Equipment [Line Items]
Total property, equipment and leasehold improvements	21.3	20.6
Leasehold improvements
Property Plant And Equipment [Line Items]
Total property, equipment and leasehold improvements	9.1	9.3
Office equipment
Property Plant And Equipment [Line Items]
Total property, equipment and leasehold improvements	$ 3.0	$ 2.7