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Income Taxes (Details 1) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Disclosure [Abstract] |  |  |
Statutory tax rate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] |  |  |
Income (benefit) taxes at statutory rates | $ (12,639,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ (23,118,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ (6,894,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income tax, net of federal benefit | (2,362,000)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | (1,651,000)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | (1,234,000)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Change in valuation allowance | 14,235,000 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 8,819,000 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 7,415,000 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Research and development tax credits | (849,000)ino_IncomeTaxReconciliationStatuteLimitations | (735,000)ino_IncomeTaxReconciliationStatuteLimitations | 190,000 ino_IncomeTaxReconciliationStatuteLimitations
Fair value warrant | (180,000)ino_IncomeTaxReconciliationFairValueWarrant | 16,129,000 ino_IncomeTaxReconciliationFairValueWarrant | (811,000)ino_IncomeTaxReconciliationFairValueWarrant
Stock compensation | 1,573,000 us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost | 279,000 us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost | 603,000 us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
Expired NOL's and credits | 728,000 ino_EffectiveIncomeTaxReconciliationExpiredNetOperatingLossesandCredits | 338,000 ino_EffectiveIncomeTaxReconciliationExpiredNetOperatingLossesandCredits | 405,000 ino_EffectiveIncomeTaxReconciliationExpiredNetOperatingLossesandCredits
Limited NOL's and credits | (749,000)ino_EffectiveIncomeTaxReconciliationLimitedNetOperatingLossesandCredits | 605,000 ino_EffectiveIncomeTaxReconciliationLimitedNetOperatingLossesandCredits | (124,000)ino_EffectiveIncomeTaxReconciliationLimitedNetOperatingLossesandCredits
Change in state tax rate | (60,000)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate | (623,000)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate | 438,000 us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate
Other | 332,000 us-gaap_IncomeTaxReconciliationOtherAdjustments | (12,000)us-gaap_IncomeTaxReconciliationOtherAdjustments | 42,000 us-gaap_IncomeTaxReconciliationOtherAdjustments
Income Tax Expense (Benefit) | $ 29,000 us-gaap_IncomeTaxExpenseBenefit | $ 31,000 us-gaap_IncomeTaxExpenseBenefit | $ 30,000 us-gaap_IncomeTaxExpenseBenefit

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e32123-109318 + Details
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