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The costs incurred in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, excluding in-process research and development acquired in a business combination consummated during the period. Excludes software research and development, which has a separate concept.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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COLLABORATION AGREEMENTS (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
COLLABORATION AGREEMENTS (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue	$ 72		$ 1,195		$ 242	$ 1,667
Research and development costs	$ 30,385		22,119		$ 121,208	61,577
Zenas BioPharma \| Fairmount Funds Management
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Noncontrolling interest ownership percentage	5.00%				5.00%
Paragon Therapeutics
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Collaborative arrangement, upfront fee payment				$ 2,500
Collaborative arrangement, rights and licenses fee		$ 2,300
Research and development costs	$ 1,100		1,600		$ 6,500	4,500
Paragon Therapeutics \| Fairmount Funds Management
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Noncontrolling interest ownership percentage	5.00%				5.00%
Collaboration Revenue \| Zenas BioPharma
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue	$ 100		$ 1,200		$ 200	$ 1,700