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Commitments and Contingencies - Narrative (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Aug. 09, 2023
USD ($)
Jun. 30, 2023
USD ($)
shares
Jun. 30, 2022
USD ($)
Dec. 31, 2019
ft²
agreement
Jun. 30, 2023
USD ($)
ft²
shares
Jun. 30, 2022
USD ($)
Mar. 31, 2023
shares
Jul. 31, 2022
USD ($)
Mar. 09, 2021
USD ($)
Lessee, Lease, Description [Line Items]                  
Lease cost   $ 856 $ 851   $ 1,700 $ 1,700      
Number of agreements | agreement       2          
Common stock, shares, issued (in shares) | shares   268,073,202     268,073,202        
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
Common stock, shares, issued (in shares) | shares             9,121,000    
Behesti v. Kim, et al. | Subsequent Event                  
Lessee, Lease, Description [Line Items]                  
Damages paid $ 1,200                
Minimum                  
Lessee, Lease, Description [Line Items]                  
Operating lease, remaining lease term   4 months 24 days     4 months 24 days        
Maximum                  
Lessee, Lease, Description [Line Items]                  
Operating lease, remaining lease term   6 years 6 months     6 years 6 months        
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       13,500 57,360