Related Party Transactions - Schedule of Related Party Accounts Payable and Other Current Liabilities (Details) - Related Party - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Related Party Transaction [Line Items]
Total related party accounts payable	$ 4.0	$ 0.6
Reimbursable costs under the Paragon Agreement
Related Party Transaction [Line Items]
Total related party accounts payable	0.0	0.1
License Agreements development milestone liability (see Note 6)
Related Party Transaction [Line Items]
Total related party accounts payable	$ 4.0	$ 0.5