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Commitments and Contingencies - Narrative (Details) $ in Thousands | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Nov. 30, 2023 ft² | Jul. 31, 2023 USD ($) | Apr. 30, 2020 director | Mar. 31, 2024 USD ($) ft² | Dec. 31, 2023 ft² | Sep. 30, 2023 ft² | Mar. 31, 2023 USD ($) shares | Dec. 31, 2019 ft² agreement | Jan. 31, 2023 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |
Lease cost |  |  |  | $ 837 |  |  | $ 840 |  |
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
Estimate of shares settlement |  |  |  |  |  |  |  |  | $ 14,000
Shares issued in settlement (in shares) | shares |  |  |  |  |  |  | 760,083 |  |
Behesti v. Kim, et al. |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |
Number of defendants | director |  |  | 8 |  |  |  |  |  |
Damages paid |  | $ 1,200 |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |
Operating lease, remaining lease term (in years) |  |  |  | 3 years 2 months 12 days |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |
Operating lease, remaining lease term (in years) |  |  |  | 5 years 9 months 18 days |  |  |  |  |
San Diego, California |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |
Area leased (in square feet) | ft² |  |  |  | 56,600 |  |  |  |  |
Plymouth Meeting, Pennsylvania |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |
Area leased (in square feet) | ft² |  |  |  | 57,400 | 7,000 | 4,400 |  | 13,500 |
San Diego, California |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |
Area leased (in square feet) | ft² | 5,600 |  |  |  |  |  |  |  |
Lessee, operating lease, term of contract (in years) | 4 years 3 months 18 days |  |  |  |  |  |  |  |
Lessee, operating lease, base rate percentage (in percent) | 3.00% |  |  |  |  |  |  |  |

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