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Commitments and Contingencies - Narrative (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Mar. 28, 2022
director
Jul. 07, 2020
director
Apr. 20, 2020
director
Jul. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
ft²
Sep. 30, 2022
USD ($)
Dec. 31, 2019
ft²
agreement
Sep. 30, 2023
USD ($)
ft²
Sep. 30, 2022
USD ($)
Mar. 31, 2023
shares
Jan. 31, 2023
USD ($)
Jul. 31, 2022
USD ($)
Lessee, Lease, Description [Line Items]                        
Lease cost         $ 851 $ 858   $ 2,500 $ 2,500      
Number of agreements | agreement             2          
McDermid v. Inovio Pharmaceuticals, Inc. and J. Joseph Kim                        
Lessee, Lease, Description [Line Items]                        
Estimate of shares settlement                     $ 14,000 $ 14,000
Estimate of cash settlement                     $ 30,000 $ 30,000
Shares issued in settlement (in shares) | shares                   9,121,000    
Behesti v. Kim, et al.                        
Lessee, Lease, Description [Line Items]                        
Number of defendants | director     8                  
Damages paid       $ 1,200                
Fettig v. Kim et al                        
Lessee, Lease, Description [Line Items]                        
Number of defendants | director   8                    
Schumacher v. Benito et al                        
Lessee, Lease, Description [Line Items]                        
Number of defendants | director 8                      
Minimum                        
Lessee, Lease, Description [Line Items]                        
Operating lease, remaining lease term         2 months 12 days     2 months 12 days        
Maximum                        
Lessee, Lease, Description [Line Items]                        
Operating lease, remaining lease term         6 years 3 months 18 days     6 years 3 months 18 days        
San Diego, California                        
Lessee, Lease, Description [Line Items]                        
Area leased (in square feet) | ft²               82,200        
Plymouth Meeting, Pennsylvania                        
Lessee, Lease, Description [Line Items]                        
Area leased (in square feet) | ft²         4,400   13,500 57,360