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Commitments and Contingencies - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Dec. 31, 2019 ft² agreement | Sep. 30, 2022 USD ($) ft² | Sep. 30, 2021 USD ($) | Jul. 31, 2022 USD ($) | Mar. 09, 2021 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Lease cost | $ 858 | $ 852 |  | $ 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 cash settlement |  |  |  |  |  | $ 30,000 | $ 30,000
Estimate of shares settlement |  |  |  |  |  | $ 14,000 | $ 14,000
Minimum |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Operating lease, remaining lease term | 1 year 2 months 12 days |  |  | 1 year 2 months 12 days |  |  |
Maximum |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Operating lease, remaining lease term | 7 years 3 months 18 days |  |  | 7 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 |  |  | 13,500 | 57,360 |  |  |

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