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Related Party Transactions - Additional Information (Details) - USD ($)

1 Months Ended

3 Months Ended

6 Months Ended

Jun. 30, 2024

Jun. 30, 2025

Jun. 30, 2024

Jun. 30, 2025

Jun. 30, 2024

Dec. 31, 2024

Related Party Transaction [Line Items]

Research and development expense

^[1]

$ 22,680,000

$ 15,689,000

$ 42,252,000

$ 28,193,000

General and administrative expense

^[2]

6,816,000

$ 5,111,000

14,352,000

9,701,000

Accounts payable

3,176,000

3,176,000

$ 1,954,000

Accrued expenses

6,944,000

6,944,000

6,076,000

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

0

69,000

Accounts payable

0

0

0

Accrued expenses

0

0

0

Third Rock

Related Party Transaction [Line Items]

Costs incurred

0

$ 100,000

Accrued expenses

$ 0

$ 0

$ 0

[1]	Includes related party amounts of zero for each of the three months ended June 30, 2025 and 2024, and zero and less than $0.1 million for the six months ended June 30, 2025 and 2024, respectively (see Note 10).
[2]	Includes related party amounts of zero for each of the three months ended June 30, 2025 and 2024, and zero and $0.1 million for the six months ended June 30, 2025 and 2024, respectively (see Note 10).

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