v3.25.2
Business Segment - Summary of Segment Reporting Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting, Asset Reconciling Item [Line Items]            
Total revenues $ 160   $ 39   $ 188 $ 184
Less:            
Impairment of long-lived assets 0   0 $ 20 0 20
Income tax expense 0   0   0 0
Net income (loss) 0 $ (112) (93) $ (4) (112) (97)
Reportable segment            
Segment Reporting, Asset Reconciling Item [Line Items]            
Total revenues 160   39   188 184
Less:            
Late-stage development programs 74   64   129 127
Early-stage development and preclinical programs 38   33   80 58
Compensation and personnel costs 61   64   128 128
Depreciation and amortization 2   2   5 5
Impairment of long-lived assets 0   0   0 20
Interest income, net (8)   (13)   (18) (25)
Income tax expense 0   0   0 0
Other segment items 26   22   47 45
Partnership reimbursements (33)   (40)   (71) (77)
Net income (loss) $ 0   $ (93)   $ (112) $ (97)