LICENSE AGREEMENTS AND COMMITMENTS - Summary of Significant Agreements and Commitments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Financial statement information
Accrued liabilities, current	$ 13,166	$ 13,241
Accrued liabilities, noncurrent	5,375	2,250
License Agreement | MSK
Milestones
Maximum Clinical Milestones	2,450
Maximum Regulatory Milestones	9,000
Maximum Sales-based Milestones	20,000
Financial statement information
Cash paid	6,027	2,871
Expense	5,158	3,582
Accrued liabilities, current	2,452	3,397
Accrued liabilities, noncurrent	1,950	1,950
License Agreement | MabVax
Milestones
Maximum Clinical Milestones	200
Maximum Regulatory Milestones	1,200
Financial statement information
Cash paid	10	10
Expense	10	10
CD33 License Agreement | MSK
Milestones
Maximum Clinical Milestones	550
Maximum Regulatory Milestones	500
Maximum Sales-based Milestones	7,500
Financial statement information
Cash paid		150
Accrued liabilities, noncurrent	300	300
SADA License Agreement | MSK and MIT
Milestones
Maximum Clinical Milestones	4,730
Maximum Regulatory Milestones	18,125
Maximum Sales-based Milestones	23,750
Financial statement information
Cash paid	605	1,000
Expense	4,125	0
Accrued liabilities, current	1,000	605
Accrued liabilities, noncurrent	3,125
Accrued liabilities	$ 1,000	$ 605