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Description of Business - Schedule of Impact of Change in Reporting Entity on Unaudited Condensed Consolidated Statements of Operations (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Name Change Event [Line Items]        
Revenue $ 139 $ 622 $ 240 $ 934
Operating expenses:        
Research and development (including amounts with related parties) 41,128 232,366 248,149 195,958
Selling, general and administrative (including amounts with related parties) 45,275 129,620 102,708 135,256
Loss from operations (86,264) (362,250) (351,298) (330,280)
Other (expense) income, net (including amounts with related parties) 5,789 (221,642) (65,988) (19,559)
Income tax expense (6) 40 (34) (9)
Net loss (80,481) $ (583,852) $ (417,320) $ (349,848)
Reportable Legal Entities | NantCell        
Name Change Event [Line Items]        
Revenue 183      
Operating expenses:        
Research and development (including amounts with related parties) 21,509      
Selling, general and administrative (including amounts with related parties) 24,382      
Loss from operations (45,708)      
Other (expense) income, net (including amounts with related parties) (848)      
Income tax expense 0      
Net loss (46,556)      
Reportable Legal Entities | NantKwest        
Name Change Event [Line Items]        
Revenue 0      
Operating expenses:        
Research and development (including amounts with related parties) 19,725      
Selling, general and administrative (including amounts with related parties) 20,903      
Loss from operations (40,628)      
Other (expense) income, net (including amounts with related parties) 6,637      
Income tax expense (6)      
Net loss (33,997)      
Intercompany Eliminations        
Name Change Event [Line Items]        
Revenue (44)      
Operating expenses:        
Research and development (including amounts with related parties) (106)      
Selling, general and administrative (including amounts with related parties) (10)      
Loss from operations 72      
Other (expense) income, net (including amounts with related parties) 0      
Income tax expense 0      
Net loss $ 72