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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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