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Segment Reporting - Segment Profit And Loss (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting
Collaboration revenue	$ 706			$ 0			$ 706	$ 0
Research and development	24,149			20,510			77,880	56,945
General and administrative	10,661			8,504			29,745	25,022
Stock-based compensation expense	4,308			3,434			12,498	9,639
Other income, net	2,461			4,480			8,515	13,333
Net loss	(31,643)	$ (33,052)	$ (33,709)	(24,534)	$ (24,172)	$ (19,928)	(98,404)	(68,634)
Single reportable segment
Segment Reporting
Collaboration revenue	706						706
Stock-based compensation expense	4,308			3,434			12,498	9,639
Consulting and professional services expenses	3,961			4,847			12,239	12,675
Other segment expenses	1,382			1,498			5,149	4,226
Other income, net	(2,461)			(4,480)			(8,515)	(13,333)
Net loss	31,643			24,534			98,404	68,634
Single reportable segment | Navenibart
Segment Reporting
Research and development	13,438			8,797			36,349	23,868
Single reportable segment | STAR-0310
Segment Reporting
Research and development	2,377			3,539			15,551	12,224
Single reportable segment | Employee expenses
Segment Reporting
Research and development	5,393			3,689			14,690	10,321
General and administrative	3,646			2,877			10,500	8,476
Single reportable segment | Program support
Segment Reporting
General and administrative	$ 305			$ 333			$ 649	$ 538

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