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Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Segment Information
Revenue	$ 5,000	$ 50,000
Research and development expenses	(139,139)	(60,033)
General and administrative	(29,749)	(17,114)
Stock-based compensation	(10,821)	(3,495)
Net loss to common stockholders	(156,988)	(37,124)
Single Reportable Segment
Segment Information
Revenue	5,000	50,000
General and administrative	22,995	15,218
Stock-based compensation	10,821	3,495
Other segment items	(6,901)	9,977
Net loss to common stockholders	(156,988)	(37,124)
Single Reportable Segment | Obexelimab
Segment Information
Research and development expenses	94,563	25,446
Single Reportable Segment | Other programs (ZB002 & ZB004)
Segment Information
Research and development expenses	2,115	6,242
Single Reportable Segment | Partnered regional programs (ZB001 & ZB005)
Segment Information
Research and development expenses	6,737	6,738
Single Reportable Segment | Unallocated
Segment Information
Research and development expenses	$ 31,658	$ 20,008

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