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Restructuring, Impairment and Costs of Terminated Program, and Impairment of Goodwill - Narrative (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 21 Months Ended
Jun. 30, 2023
Jan. 31, 2023
Apr. 30, 2022
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Sep. 30, 2023
Restructuring Cost and Reserve [Line Items]                            
Non-cash impairment charges       $ (10,567)             $ (35,329) $ (53,401)    
Impairment of other property, plant and equipment           $ 1,700         1,299 5,120    
Gain on net impairment                     1,300      
Impairment of goodwill       0   76,500   $ 0     76,501 0    
Nektar 214 | Research and Development Expense | Bristol Myers Squibb Company                            
Restructuring Cost and Reserve [Line Items]                            
Reimbursement of expenses               8,300   $ 24,900   16,700    
2022 Restructuring Plan                            
Restructuring Cost and Reserve [Line Items]                            
Non-cash impairment charges       (1,467) $ (13,255) 0 $ (12,361) (1,200) $ (52,200)     (80,483)    
Contract termination and other restructuring costs       0       5,023     878 $ 7,064   $ 11,800
2023 Restructuring Plan                            
Restructuring Cost and Reserve [Line Items]                            
Non-cash impairment charges       10,200   11,500         36,600      
Contract termination and other restructuring costs       0             34      
2023 Restructuring Plan | Third St. Facility                            
Restructuring Cost and Reserve [Line Items]                            
Non-cash impairment charges         6,200                  
2023 Restructuring Plan | Mission Bay Facility                            
Restructuring Cost and Reserve [Line Items]                            
Non-cash impairment charges       10,600 $ 7,100                  
2023 Restructuring Plan | Life Sciences Lease Market                            
Restructuring Cost and Reserve [Line Items]                            
Non-cash impairment charges       $ 9,100                    
2023 Restructuring Plan | Property, Plant and Equipment                            
Restructuring Cost and Reserve [Line Items]                            
Non-cash impairment charges               $ 1,200            
2023 Restructuring Plan | Office and Laboratory Space | Mission Bay Facility                            
Restructuring Cost and Reserve [Line Items]                            
Non-cash impairment charges           $ 11,500         $ 20,600      
Measurement Input, Market Participant Subtenant Borrowing Rate                            
Restructuring Cost and Reserve [Line Items]                            
Operating lease, measurement input           7.90%     6.40%          
Measurement Input, Market Participant Subtenant Borrowing Rate | 2023 Restructuring Plan                            
Restructuring Cost and Reserve [Line Items]                            
Sublease income, measurement input       8.70% 8.50%                  
Employee Severance                            
Restructuring Cost and Reserve [Line Items]                            
Restructuring, impairment, and costs of terminated program       $ 535 $ 1,943 $ 5,483                
Payments during the period   $ 3,300   887 6,624 3,299                
Employee Severance | 2022 Restructuring Plan                            
Restructuring Cost and Reserve [Line Items]                            
Workforce termination, percentage     70.00%                      
Restructuring, impairment, and costs of terminated program       0 0 0                
Payments during the period       0 0 3,299                
Employee Severance | 2023 Restructuring Plan                            
Restructuring Cost and Reserve [Line Items]                            
Workforce termination, percentage 60.00%                          
Restructuring, impairment, and costs of terminated program       535 1,943 5,483             $ 30,900  
Payments during the period       $ 887 $ 6,624 $ 0