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Collaborative Agreements (Details) - Collaborative Arrangement, Product [Member] $ in Thousands			1 Months Ended		3 Months Ended
	Aug. 07, 2015 USD ($) product	Nov. 14, 2014	Apr. 30, 2015 USD ($)	Sep. 30, 2013 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Upfront payment received				$ 10,000
INO-3112 [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue recognized	$ 15,000
License To Research Collaboration Products [Member] | Nonsoftware License Arrangement [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Deferred revenue, additions	12,500
INO 5150 [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue recognized				5,000
INO 1800 [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue recognized				3,400
Option Right [Member] | Nonsoftware License Arrangement [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Deferred revenue, additions				1,500
Joint Steering Committee Obligation [Member] | Nonsoftware License Arrangement [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Deferred revenue, additions				155
MedImmune [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Upfront payment received	27,500
Anticipated development and regulatory event based payment receivable milestones	$ 700,000
Number of additional products to be developed | product	2
Revenue under collaborative research and development arrangements					$ 390
Deferred revenue					13,100
Accounts receivable					829
Hoffman-La Roche [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Upfront payment received				10,000
Anticipated development and regulatory event based payment receivable milestones				$ 3,000
Revenue under collaborative research and development arrangements						$ 3,000
Deferred revenue					23
Accounts receivable					2,400
Length of period after date of product first commercial sale to determine agreement in effect terms				10 years
Previously deferred revenue recognized					1,400	$ 4,200
Hoffman-La Roche [Member] | INO 5150 [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Days subsequent to termination notice effective		90 days
Defense Advanced Research Projects Agency (DARPA) [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Deferred revenue					290
Accounts receivable					6,300
Term			2 years
Base award			$ 19,600
Option award			24,600
Second option award			$ 11,100
Previously deferred revenue recognized					$ 4,600

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