Related Party Transactions - Additional Information (Details) - USD ($)		1 Months Ended	3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Related Party Transaction [Line Items]
Research and development expense	[1]		$ 15,689,000	$ 4,721,000	$ 28,193,000	$ 8,620,000
General and administrative expense	[2]		5,111,000	$ 1,909,000	9,701,000	3,201,000
Accounts payable	[3]	$ 1,875,000	1,875,000		1,875,000		$ 2,502,000
Accrued expenses	[3]	$ 5,517,000	$ 5,517,000		5,517,000		5,631,000
Common Stock
Related Party Transaction [Line Items]
Additional share purchased			9,200,000
IPO | Common Stock
Related Party Transaction [Line Items]
Additional share purchased		9,200,000
Janssen
Related Party Transaction [Line Items]
Costs incurred					69,000	200,000
Accounts payable		$ 0	$ 0		0		0
Accrued expenses		0	0		0		0
Third Rock
Related Party Transaction [Line Items]
Costs incurred					100,000	800,000
Research and development expense					0	300
General and administrative expense					100,000	$ 500,000
Accounts payable		0	0		0		200,000
Accrued expenses		$ 13,000	$ 13,000		$ 13,000		$ 0

[1] Includes related party amounts of zero and $0.2 million for the three months ended June 30, 2024 and 2023, respectively and less than $0.1 million and $0.5 million for the six months ended June 30, 2024 and 2023, respectively (see Note 10).

[2] Includes related party amounts of zero and $0.2 million for the three months ended June 30, 2024 and 2023, respectively and $0.1 million and $0.5 million for the six months ended June 30 2024 and 2023, respectively (see Note 10).

[3] Includes related party amounts of zero and $0.2 million (accounts payable) and less than $0.1 million and zero (accrued expenses) as of June 30, 2024 and December 31, 2023, respectively (see Notes 5 and 10).