Paragon Agreement (Details) $ in Millions			1 Months Ended	12 Months Ended
	Jul. 12, 2023 USD ($)	Jun. 22, 2023 USD ($)	May 31, 2023 USD ($) researchProgram	Dec. 31, 2023 USD ($)
Paragon Therapeutics Inc
Related Party Transaction [Line Items]
Milestone payments				$ 39.5
Parapyre Option Obligation
Related Party Transaction [Line Items]
Percentage of annual equity grant of options			1.00%
Paragon Agreement
Related Party Transaction [Line Items]
Number of research programs | researchProgram			4
Related party expenses incurred prior to asset acquisition		$ 19.0
Related party expenses unpaid prior to asset acquisition		19.0
Stock Compensation And Research And Development Expense
Related Party Transaction [Line Items]
Related party transaction amount				$ 48.5
Related Party | Paragon Agreement
Related Party Transaction [Line Items]
Research initiation fees		3.0	$ 3.0
Reimbursable research costs		16.0
Nonrefundable research initiation fee for one program paid in cash		$ 0.8
Related Party | SPY001 License Agreement
Related Party Transaction [Line Items]
Nomination fee	$ 1.5
Milestone payments	$ 2.5