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Commitments and Contingencies - Narrative (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 30, 2023 USD ($) ft² lease | Jul. 31, 2023 USD ($) | Apr. 30, 2020 defendent | Dec. 31, 2023 ft² | Sep. 30, 2023 ft² | Dec. 31, 2019 ft² agreement | Dec. 31, 2023 USD ($) ft² | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Mar. 31, 2023 shares | Jan. 31, 2023 USD ($) | Jul. 31, 2022 USD ($)
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of leases amended | lease | 1 |  |  |  |  |  |  |  |  |  |  |
Area under lease amended | ft² | 31,207 |  |  |  |  |  |  |  |  |  |  |
Lease, cost |  |  |  |  |  |  | $ 3,500 | $ 3,400 | $ 3,400 |  |  |
Number of agreements | agreement |  |  |  |  |  | 2 |  |  |  |  |  |
McDermid v. Inovio Pharmaceuticals, Inc. and J. Joseph Kim |  |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimate of cash settlement |  |  |  |  |  |  |  |  |  |  | $ 30,000 | $ 30,000
Estimate of shares settlement |  |  |  |  |  |  |  |  |  |  | $ 14,000 | $ 14,000
Shares issued in settlement (in shares) | shares |  |  |  |  |  |  |  |  |  | 760,083 |  |
Behesti v. Kim, et al. |  |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of defendants | defendent |  |  | 8 |  |  |  |  |  |  |  |  |
Damages paid |  | $ 1,200 |  |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating lease, remaining lease term |  |  |  | 3 years 4 months 24 days |  |  | 3 years 4 months 24 days |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating lease, remaining lease term |  |  |  | 6 years |  |  | 6 years |  |  |  |  |
San Diego, California |  |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Lessee, operating lease, area of land under lease | ft² | 5,563 |  |  |  |  |  | 56,600 |  |  |  |  |
Initial term of contract | 4 years 3 months 18 days |  |  |  |  |  |  |  |  |  |  |
Annual increase of base rent percentage | 3.00% |  |  |  |  |  |  |  |  |  |  |
Deposit payments | $ 33 |  |  |  |  |  |  |  |  |  |  |
Plymouth Meeting, Pennsylvania |  |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Lessee, operating lease, area of land under lease | ft² |  |  |  | 7,000 | 4,400 | 13,500 | 57,360 |  |  |  |  |

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