Merger and Related Transactions (Details) $ in Thousands			1 Months Ended	12 Months Ended
	Jul. 17, 2024 USD ($)	Mar. 21, 2024 USD ($) member shares	Jul. 31, 2024 shares	Dec. 31, 2024 USD ($)
Reverse Recapitalization [Line Items]
Number of board of directors, former stockholders | member		5
Number of board of directors, combined company | member		7
Issuance of common stock from private placement, net (in shares) | shares		8,670,653
Recapitalization exchange ratio		0.2022
Sale of stock, number of shares issued (in shares) | shares		15,409,102	1,578,947
Sale of stock, consideration received	$ 30,000	$ 53,500
Sale of stock, percentage of ownership following transaction		56.00%
Cash and cash equivalents acquired		$ 112,600
Assets acquired		1,500
Payables and accruals acquired		3,200
Merger transaction costs		$ 5,100		$ 5,070
Acceleration of stock awards, expense				$ 300
Graphite Bio, Inc. Stockholders
Reverse Recapitalization [Line Items]
Sale of stock, percentage of ownership following transaction		31.00%
PIPE Investors
Reverse Recapitalization [Line Items]
Sale of stock, percentage of ownership following transaction		13.00%