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Stockholders' (Deficit) Equity - Additional Information (Detail)
 12 Months Ended 62 Months Ended
Jun. 29, 2020
USD ($)
$ / shares
shares
Sep. 26, 2019
USD ($)
$ / shares
shares
Jun. 28, 2019
USD ($)
$ / shares
shares
Mar. 11, 2019
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Mar. 09, 2021
$ / shares
Dec. 31, 2018
shares
Nov. 30, 2015
USD ($)
Class Of Stock [Line Items]                    
Share price | $ / shares         $ 0.0001   $ 0.0001      
Proceeds from equity offering, net of issuance costs paid | $         $ 86,302,000 $ 30,000,000        
Total amount authorized for repurchase | $                   $ 50,000,000.0
Repurchase of common stock, shares         0 473,586 6,403,489      
Repurchase of common stock excluding commissions, value | $           $ 500,000 $ 31,700,000      
Broker commissions on repurchases | $             100,000      
Remaining authorized repurchase amount | $         $ 18,300,000   $ 18,300,000      
Common stock, shares authorized         500,000,000 500,000,000 500,000,000      
Common stock, par value | $ / shares         $ 0.0001 $ 0.0001 $ 0.0001 $ 0.001    
Common stock, shares issued         382,243,142 371,976,995 382,243,142      
Common stock, shares outstanding         382,243,142 371,976,995 382,243,142      
Stockholders' equity note, stock split, conversion ratio         0.8190          
Stock issued during period, value, acquisitions | $           $ 30,000,000        
Altor Acquisition | Warrants                    
Class Of Stock [Line Items]                    
Stock issued during period, shares, acquisitions   3,712,800                
NantWorks | Altor Acquisition                    
Class Of Stock [Line Items]                    
Share price | $ / shares   $ 3.24                
Stock issued during period, shares, acquisitions   1,638,000                
Executive Chairman                    
Class Of Stock [Line Items]                    
Share price | $ / shares     $ 3.24              
Stock issued during period, shares, acquisitions     2,074,800              
Proceeds from issuance of warrants | $     $ 6,700,000              
Executive Chairman | Altor Acquisition                    
Class Of Stock [Line Items]                    
Share price | $ / shares   $ 3.24                
Stock issued during period, shares, acquisitions   2,074,800                
Unvested Warrants | Altor Acquisition                    
Class Of Stock [Line Items]                    
Stock issued during period, value, issued for services | $   $ 18,000,000.0                
Stock issued during period, shares, issued for services   1,638,000                
Merger with NantCell                    
Class Of Stock [Line Items]                    
Proceeds from equity offering, net of issuance costs paid | $         $ 273,700,000          
NantCell Common Stock                    
Class Of Stock [Line Items]                    
Share price | $ / shares               $ 0.001    
NantCell Common Stock | Merger with NantCell                    
Class Of Stock [Line Items]                    
Share price | $ / shares         $ 0.001   $ 0.001      
Common Stock                    
Class Of Stock [Line Items]                    
Shares issued         8,521,500          
Repurchase of common stock, shares           678,336        
Common stock, shares issued         382,243,142 371,976,995 382,243,142   348,677,955  
Stock issued during period, shares, acquisitions           2,047,500        
Stock issued during period, value, acquisitions | $           $ 0        
Common Stock | Kuwait Investment Authority                    
Class Of Stock [Line Items]                    
Share price | $ / shares       $ 14.66            
Stock issued during period, shares, acquisitions       2,047,500            
Stock issued during period, value, acquisitions | $       $ 30,000,000.0            
Common Stock | Stock Transfer Agreement                    
Class Of Stock [Line Items]                    
Share price | $ / shares   $ 9.77                
Stock issued during period, shares, acquisitions   204,750                
Stock issued during period, value, acquisitions | $   $ 2,000,000.0                
Underwritten Public Offering                    
Class Of Stock [Line Items]                    
Shares issued 8,521,500                  
Proceeds from equity offering, net of issuance costs paid | $ $ 90,700,000                  
Underwriting discounts, commissions and other offering expenses | $ $ 4,400,000                  
Underwritten Public Offering | Public                    
Class Of Stock [Line Items]                    
Shares issued 4,811,500                  
Share price | $ / shares $ 9.50                  
Underwritten Public Offering | Shares Sold to Public upon full Exercise of Underwriters Option to Purchase Additional Shares                    
Class Of Stock [Line Items]                    
Share price | $ / shares $ 9.50                  
Shares sold to public upon full exercise of underwriters' option to purchase additional shares 1,111,500                  
Underwritten Public Offering | Dr. Patrick Soon-Shiong                    
Class Of Stock [Line Items]                    
Shares issued         3,710,000          
Share price | $ / shares $ 12.12