Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands		Dec. 31, 2024	Dec. 31, 2023
Convertible preferred stock, shares authorized			189,613,384
Convertible preferred stock, shares issued			151,456,144
Convertible preferred stock, shares outstanding			151,456,144
Convertible preferred stock, liquidation preference			$ 186,182
Common stock, par value		$ 0.001	$ 0.001
Common stock, shares authorized		500,000,000	250,000,000
Common stock, shares issued		36,580,202	4,170,817
Common stock, shares outstanding		36,580,202	4,170,817
Accounts payable	[1]	$ 1,954	$ 2,502
Accrued expenses	[1]	6,076	5,631
Third Rock Ventures LLC
Accounts payable		0	200
Accrued expenses		$ 0	$ 0
Series A Convertible Preferred Stock
Convertible preferred stock, par value		$ 0.001	$ 0.001
Convertible preferred stock, shares authorized		0	100,182,354
Convertible preferred stock, shares issued		0	100,182,354
Convertible preferred stock, shares outstanding		0	100,182,354
Convertible preferred stock, liquidation preference		$ 0	$ 100,182
Series B Convertible Preferred Stock
Convertible preferred stock, par value		$ 0.001	$ 0.001
Convertible preferred stock, shares authorized		0	89,431,030
Convertible preferred stock, shares issued		0	51,273,790
Convertible preferred stock, shares outstanding		0	51,273,790
Convertible preferred stock, liquidation preference		$ 0	$ 86,000

[1] Includes related party amounts of zero and $0.2 million (accounts payable) and zero (accrued expenses) as of both December 31, 2024 and 2023, respectively (see Notes 5 and 10).