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Commitments and Contingencies - Narrative (Details) $ in Thousands	1 Months Ended			3 Months Ended					6 Months Ended
	Nov. 30, 2023 ft²	Jul. 31, 2023 USD ($)	Apr. 30, 2020 director	Jun. 30, 2024 USD ($)	Dec. 31, 2023 ft²	Sep. 30, 2023 ft²	Jun. 30, 2023 USD ($)	Dec. 31, 2019 ft² agreement	Jun. 30, 2024 USD ($) ft²	Jun. 30, 2023 USD ($)	Mar. 31, 2023 shares	Jan. 31, 2023 USD ($)
Lessee, Lease, Description [Line Items]
Lease cost				$ 521			$ 856		$ 1,400	$ 1,700
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)				2 years 10 months 24 days					2 years 10 months 24 days
Maximum
Lessee, Lease, Description [Line Items]
Operating lease, remaining lease term (in years)				5 years 6 months					5 years 6 months
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					7,000	4,400		13,500	57,400
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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