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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 |  |  |  |

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