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Certain Balance Sheet Items - Accounts Payable and Accrued Expenses (Details) - USD ($)
3 Months Ended
Mar. 31, 2023
Feb. 28, 2023
Dec. 31, 2022
Jul. 31, 2022
Mar. 09, 2021
Accounts Payable and Accrued Expenses [Line Items]          
Trade accounts payable $ 11,194,396   $ 19,862,487    
Accrued compensation 7,607,673   12,574,921    
Accrued litigation settlement 0   44,000,000    
Other accrued expenses 5,950,102   3,249,477    
Total $ 24,752,171   $ 79,686,885    
Common stock, shares, issued (in shares) 262,739,126        
McDermid v. Inovio Pharmaceuticals, Inc. and J. Joseph Kim          
Accounts Payable and Accrued Expenses [Line Items]          
Estimate of cash settlement       $ 30,000,000 $ 30,000,000
Estimate of shares settlement       $ 14,000,000 $ 14,000,000
Amount paid to other party $ 252,000        
Common stock, shares, issued (in shares)   9,121,000