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Marketable Securities and Fair Value Measurements (Details 1) (USD $)
3 Months Ended
Mar. 31, 2015
Assumptions used to estimate the fair values of the common stock warrants  
Risk-free interest rate 0.99%us-gaap_FairValueAssumptionsRiskFreeInterestRate
Expected volatility 81.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
Expected life in years 3 years 6 months
Dividend yield $ 0us-gaap_FairValueAssumptionsExpectedDividendPayments
OncoSec common stock warrants [Member]  
Assumptions used to estimate the fair values of the common stock warrants  
Expected volatility 90.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ ino_OncoSecCommonStockWarrantsAxis
= ino_OncoSecCommonStockWarrantsMember
Dividend yield $ 0us-gaap_FairValueAssumptionsExpectedDividendPayments
/ ino_OncoSecCommonStockWarrantsAxis
= ino_OncoSecCommonStockWarrantsMember
OncoSec common stock warrants [Member] | Minimum [Member]  
Assumptions used to estimate the fair values of the common stock warrants  
Risk-free interest rate 0.41%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ ino_OncoSecCommonStockWarrantsAxis
= ino_OncoSecCommonStockWarrantsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Expected life in years 1 year 6 months
OncoSec common stock warrants [Member] | Maximum [Member]  
Assumptions used to estimate the fair values of the common stock warrants  
Risk-free interest rate 0.56%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ ino_OncoSecCommonStockWarrantsAxis
= ino_OncoSecCommonStockWarrantsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Expected life in years 2 years