License, Collaboration, and Success Payment Agreements - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Oct. 31, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) $ / shares
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Research and development expense	$ 39,500,000	$ 43,849,000	$ 122,935,000	$ 135,950,000
Series A Convertible Preferred Stock
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Convertible preferred stock, par value (in dollars per share) | $ / shares						$ 1.83		$ 1.83
Fred Hutch | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Annual license maintenance payments								$ 50,000
Aggregate research payments due								$ 12,000,000
Term of collaborative arrangement for research								6 years
Research and development expense	200,000	300,000	400,000	700,000
Aggregate success payments	0		0
Term of success payment agreement								9 years
Trigger period from IPO date								1 year
Trigger period thereafter								2 years
Fair value of potential success payments due	300,000		300,000		$ 700,000
Success payment expense (reversal)	(100,000)	(1,500,000)	(400,000)	(2,100,000)
Fred Hutch | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Minimum
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Multiple of initial equity value at issuance								10
Aggregate success payments								$ 10,000,000
Per share common stock price required for payment (in dollars per share) | $ / shares								$ 18.29
Fred Hutch | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Maximum
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Multiple of initial equity value at issuance								50
Aggregate success payments								$ 200,000,000
Per share common stock price required for payment (in dollars per share) | $ / shares								$ 91.44
Stanford | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Annual license maintenance payments							$ 50,000
Aggregate research payments due						$ 12,000,000
Term of collaborative arrangement for research						4 years
Research and development expense	800,000	800,000	2,300,000	2,300,000
Aggregate success payments	0		0
Term of success payment agreement						9 years
Trigger period from IPO date						1 year
Trigger period thereafter						2 years
Fair value of potential success payments due	600,000		600,000		1,100,000
Success payment expense (reversal)	0	$ (1,200,000)	(300,000)	$ (1,200,000)
Success payment liability	$ 600,000		$ 600,000		$ 900,000
Stanford | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | License
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Potential milestone payments due							2,500,000
Stanford | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Minimum
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Multiple of initial equity value at issuance						10
Aggregate success payments						$ 10,000,000
Per share common stock price required for payment (in dollars per share) | $ / shares						$ 18.29
Stanford | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Maximum
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Multiple of initial equity value at issuance						50
Aggregate success payments						$ 200,000,000
Per share common stock price required for payment (in dollars per share) | $ / shares						$ 91.44
Stanford | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Maximum | License
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Potential milestone payments due							$ 3,700,000