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Collaborative Agreements (Details)			1 Months Ended					3 Months Ended									12 Months Ended
	Dec. 29, 2017	Aug. 07, 2015 USD ($) product	Dec. 31, 2017 USD ($)	Feb. 28, 2017 USD ($)	Sep. 30, 2015 USD ($)	Apr. 30, 2015 USD ($)	Sep. 30, 2013 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue under collaborative research and development arrangements									$ 7,409,214	$ 351,272	$ 16,358,316	$ 4,288,586	$ 476,586	$ 2,327,316	$ 1,889,988	$ 1,796,857	$ 28,407,388	$ 6,490,747	$ 26,876,533
Collaborative Arrangement, Product
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Upfront payment received							$ 10,000,000
MedImmune | Collaborative Arrangement, Product
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Upfront payment received		$ 27,500,000			$ 27,500,000
Additional revenue to be achieved		$ 700,000,000
Number of additional products | product		2
Revenue recognized			$ 7,000,000
Revenue under collaborative research and development arrangements																	22,300,000	1,500,000
Deferred revenue			1,100,000						1,100,000				13,700,000				1,100,000	13,700,000
Accounts receivable			1,700,000						1,700,000				1,200,000				1,700,000	1,200,000
Roche | Collaborative Arrangement, Product
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Upfront payment received							10,000,000
Revenue under collaborative research and development arrangements																	6,100,000	4,900,000
Accounts receivable			0						0				2,400,000				0	2,400,000
Full payment				$ 8,500,000
DARPA | Collaborative Arrangement, Product
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Deferred revenue			149,000						149,000				1,200,000				149,000	1,200,000
Accounts receivable			$ 4,100,000						$ 4,100,000				$ 9,200,000				4,100,000	9,200,000
Term						2 years
Base award						$ 19,600,000
Previously deferred revenue recognized																	$ 9,800,000	$ 22,400,000
Option award						24,600,000
Second option award						$ 11,100,000
ApolloBio | Collaborative Arrangement, Product
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Territory expansion option period	3 years
INO-3112 | Collaborative Arrangement, Product
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue recognized		$ 15,000,000
INO 5150 | Collaborative Arrangement, Product
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue recognized							8,400,000
Nonsoftware License Arrangement | License To Research Collaboration Products | Collaborative Arrangement, Product
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Deferred revenue, additions		$ 12,500,000
Nonsoftware License Arrangement | Option Right | Collaborative Arrangement, Product
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Deferred revenue, additions							1,500,000
Nonsoftware License Arrangement | Joint Steering Committee Obligation | Collaborative Arrangement, Product
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Deferred revenue, additions							$ 155,000
Scenario, Forecast | ApolloBio | Collaborative Arrangement, Product
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Upfront payment received								$ 23,000,000
Additional revenue to be achieved								$ 20,000,000
Duration for upfront payment to be made following date of approval of collaborative agreement								3 days
Obligation period to pay royalties								10 years

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