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License and Collaboration Agreements - Additional Information (Details) - USD ($) $ in Thousands			1 Months Ended		3 Months Ended			9 Months Ended		12 Months Ended
	Jan. 01, 2024	Sep. 30, 2022	Mar. 31, 2023	Jul. 31, 2020	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2020
Preferred stock, shares issued (in shares)					0			0			0
Acquired IPR&D expense		$ 3,000
Quarterly fee								$ 1,300
Total operating costs and expenses					$ 24,152	$ 71,611		79,224	$ 169,211
Delivery fee								200
Completion fee								200
Exercise fee								$ 1,000
Accrued Upfront Fee												$ 200
Royalty Based on Net Sales of Licensed Products, Percentage								1.00%
Royalty expense								$ 0
Research and Development [Member]
Quarterly fee	$ 600				600	600		1,800	1,800
Adimab Assignment Agreement [Member]
Milestone payment								11,100		$ 11,100
Royalty expense					500	500		$ 1,400	500
Adimab Assignment Agreement [Member] | Maximum [Member]
Potential milestone payment				$ 24,600
Royalty percentage of sublicense consideration								55.00%
Adimab Assignment Agreement [Member] | Minimum [Member]
Royalty percentage of sublicense consideration								45.00%
Adimab Assignment Agreement [Member] | Research and Development [Member]
Recognized expense					0	0		$ 0	0
Adimab Assignment Agreement [Member] | Acquired In Process Research And Development Expense [Member]
Milestone payment			$ 400		0	0	$ 3,200	0	0
Adimab Assignment Agreement [Member] | First Product [Member]
Potential milestone payment				16,500
Adimab Assignment Agreement [Member] | Second Product [Member]
Potential milestone payment				$ 8,100
Adimab Collaboration Agreement [Member]
Total operating costs and expenses					0	0		0	0
Adimab Collaboration Agreement [Member] | Research and Development [Member]
Quarterly fee					600	600		1,800	1,800
Adimab Collaboration Agreement [Member] | Acquired In Process Research And Development Expense [Member]
Delivery fee					0	0		0	0
Completion fee					0	0		0	0
Exercise fee					0	0			0
Adimab Collaboration Agreement [Member] | Research Development And Regulatory Milestone
Potential milestone payment								18,000
Adimab Platform Transfer Agreement [Member]
Research and development expenses					500	500		1,500	1,500
Adimab Platform Transfer Agreement [Member] | Research Development And Regulatory Milestone
Potential milestone payment								9,500
Cell Line License Agreement [Member]
Acquired IPR&D expense					$ 0	$ 0		$ 0	$ 0

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