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Segment Disclosures - Schedule of Revenue and Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting Information [Line Items]            
Total revenue $ 1,418   $ 18,658   $ 11,677 $ 69,575
General research and development expenses 1,925   1,520   4,808 4,050
Total external costs 9,086   5,599   20,511 14,394
Internal costs 8,512   7,723   16,325 17,795
Research and development expenses 17,598   13,322   36,836 32,189
General and administrative expenses 7,601   6,622   18,294 16,050
Total operating expenses 25,199   19,944   55,130 48,239
Income (loss) from operations (23,781)   (1,286)   (43,453) 21,336
Interest income 3,157   1,178   4,647 2,133
Other income 18   17   11 28
Income (loss) before income taxes (20,606)   (91)   (38,795) 23,497
Provision for income taxes 60   63   119 126
Net income (loss) (20,666) $ (18,248) (154) $ 23,525 (38,914) 23,371
Varseta-M (EpCAM)            
Segment Reporting Information [Line Items]            
Total external costs 6,225   3,679   14,039 7,949
CX-801 (IFNAlpha2b)            
Segment Reporting Information [Line Items]            
Total external costs 437   452   781 940
CX-904 (EGFRxCD3)            
Segment Reporting Information [Line Items]            
Total external costs 227   (550)   468 561
Other Wholly Owned and Partnered Programs            
Segment Reporting Information [Line Items]            
Total external costs $ 272   $ 498   $ 415 $ 894