Collaborative Agreements	12 Months Ended
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Collaborative Agreements	Collaborative Agreements MedImmune On August 7, 2015, The Company entered into a license and collaboration agreement with MedImmune, the global biologics research and development arm of AstraZeneca. Under the agreement, MedImmune acquired exclusive rights to the Company's INO-3112 immunotherapy, renamed as MEDI0457, which targets cancers caused by human papillomavirus (HPV) types 16 and 18. MedImmune made an upfront payment of $27.5 million to the Company in September 2015 and has agreed to make additional future development, regulatory and commercial event based payments totaling up to $700 million. MedImmune will fund all development costs associated with INO-3112 immunotherapy. The Company is entitled to receive up to mid-single to double-digit tiered royalties on INO-3112 product sales. Within the broader collaboration, the Company and MedImunne will attempt to develop up to two additional DNA-based cancer vaccine products not included in the Company's current product pipeline, which MedImmune will have the exclusive rights to develop and commercialize. The Company has assessed event-based payments under the authoritative guidance for research and development milestones and determined that none of the event- based payments represent a milestone under the milestone method of accounting. The Company identified the deliverables at the inception of the agreement. The Company has determined that the license to INO-3112, the license for the research collaboration products with related research and development services and the product development services for INO-3112 individually represent separate units of accounting because each deliverable has standalone basis. The Company considered the provisions of the multiple-element arrangement guidance in determining whether the deliverables outlined above have standalone basis and thus should be treated as separate units of accounting. The Company determined that the license for INO-3112, the license for the research collaboration products with related research and development services, and the product development services for INO-3112 have standalone basis and represent separate units of accounting because the rights conveyed permit MedImmune to perform all efforts necessary to complete development, commercialize and begin selling the product upon regulatory approval. In addition, MedImmune has the appropriate development, regulatory and commercial expertise with products similar to the product licensed under the agreement and has the ability to engage third parties to manufacture the product allowing MedImmune to realize the value of the license without receiving any of the remaining deliverables. MedImmune can also sublicense its license rights to third parties. Also, the Company determined that the product development services for INO-3112 represents an individual unit of accounting as MedImmune could perform such services and/or could acquire these on a separate basis. The best estimated selling prices for these units of accounting were determined based on market conditions, the terms of comparable collaborative agreements for similar technology in the pharmaceutical and biotechnology industry, the Company's pricing practices and pricing objectives and the nature of the research and development services to be provided. While market data and the cost-to-recreate method under the cost approach were considered throughout the valuation process, ultimately, the estimated selling prices of the licenses were determined utilizing two forms of the relief from royalty method under the income approach. The arrangement consideration was allocated to the deliverables based on the relative selling price method. The amount allocable to the delivered unit or units of accounting is limited to the amount that is considered fixed and determinable and is not contingent upon the delivery of additional items or meeting other specified performance conditions. Based on the results of the Company's analysis, the $27.5 million up-front payment was allocated as follows: $15.0 million to the product license to INO-3112 and $12.5 million for the license to the research collaboration products and related research and developments services. The amount allocated to the license for INO-3112 was recognized as revenue under collaborative research and development arrangements during the year ended December 31, 2015 as this was determined to be earned upon the granting of the license and delivery of the related knowledge and data. The remaining amount related to the research collaboration products and related research and development services of $12.5 million was recognized as revenue under collaboration research and development arrangements during the quarter ended June 30, 2017, upon selection of the first research collaboration product candidate by MedImmune. The Company believes that no substantive value related to the research collaboration products license and research services was transferred to MedImmune prior to their selection of the first research collaboration product since there was no economic benefit from the research unless such product candidate was selected. Therefore, the Company believes the license for the research collaboration products was delivered and the research services were completed upon the selection of the product candidate by MedImmune in June 2017. The Company performs certain product development services for INO-3112 and is reimbursed by MedImmune for these services. The Company recognizes revenues associated with these services as revenues under collaborative arrangements as the related services are performed and according to the relative selling price method of the allocable arrangement consideration. In December 2017, the Company received a $7.0 million milestone payment from MedImmune triggered by the initiation of the Phase 2 portion of an ongoing clinical trial under the agreement. This amount was recognized in full as revenue for the year ended December 31, 2017. During the years ended December 31, 2017 and 2016, the Company recognized revenues of $22.3 million and $1.5 million from MedImmune, respectively. As of December 31, 2017 and 2016, the Company has a deferred revenue balance of $1.1 million and $13.7 million, respectively, related to the Agreement. As of December 31, 2017 and 2016, the Company had an accounts receivable balance of $1.7 million and $1.2 million, respectively, related to the collaboration agreement with MedImmune. Roche In September 2013, the Company entered into a Collaborative, License, and Option Agreement with Roche and received an upfront payment of $10.0 million. The parties agreed to co-develop multi-antigen DNA immunotherapies targeting prostate cancer and hepatitis B. On November 14, 2014, Roche provided notice to the Company that it would be partially terminating the agreement with respect to the development of the Company’s DNA immunotherapy targeting prostate cancer. The termination was effective in February 2015. All of Roche’s rights to the Company’s DNA immunotherapy targeting prostate cancer, including the right to license the product to other parties, have been returned to the Company. On July 28, 2016, Roche provided notice to the Company that it would be discontinuing the agreement and its development of INO-1800, the Company’s DNA immunotherapy against the hepatitis B virus. The termination was effective in October 2016. All of Roche’s rights to INO-1800, including the right to license the product to other parties, have been returned to the Company. In February 2017, the Company received full payment of $8.5 million from Roche for its past and future obligations associated with the termination of the agreement. The Company identified the deliverables at the inception of the agreement. The Company determined that the license to the targets, the option right to license additional vaccines, research and development services, manufacturing and drug supply, and participation in the joint steering committee individually represented separate units of accounting because each deliverable had standalone value. The amount allocable to the delivered unit or units of accounting using the best estimated selling price was limited to the amount that was considered fixed and determinable and was not contingent upon the delivery of additional items or meeting other specified performance conditions. Based on the results of the Company's analysis, the $10.0 million up-front payment was allocated as follows: $8.4 million to the license to the targets, $1.5 million to the option right and $155,000 to the joint steering committee obligation. The amounts allocated to the licenses for the targets was recognized as revenue in 2013 as these were determined to be earned upon the granting of the license and delivery of the related knowledge and data. The Company recognized revenues associated with research and development services and manufacturing and drug supply as revenues under collaborative arrangements as the related services were performed and according to the relative selling price method of the allocable arrangement consideration. During the years ended December 31, 2017 and 2016, the Company recognized revenues of $6.1 million and $4.9 million from Roche, respectively. As of December 31, 2017 and 2016, the Company has an accounts receivable balance of $0 and $2.4 million, respectively, related to the Roche Agreement. DARPA- Ebola In April 2015, the Company received a grant from the Defense Advanced Research Projects Agency ("DARPA") to lead a collaborative team to develop multiple treatment and prevention approaches against Ebola. The consortium, led by the Company, is taking a multi-faceted approach to develop products to prevent and treat Ebola infection. The award covers pre-clinical development costs as well as good manufacturing practice manufacturing costs and the Phase 1 clinical study costs. The funding period is over two years and covers a base award of $19.6 million and an option award of $24.6 million, which was exercised in September 2015. The development proposal includes a second option of $11.1 million to support additional product supply and clinical development activities. The options are contingent upon the successful completion of certain pre-clinical development milestones. During the years ended December 31, 2017 and 2016, the Company recognized revenues of $9.8 million and $22.4 million, respectively, from DARPA related to the grant. As of December 31, 2017 and 2016, the Company had a deferred revenue balance of $149,000 and $1.2 million, respectively, related to the DARPA grant. As of December 31, 2017 and 2016, the Company had an accounts receivable balance of $4.1 million and $9.2 million, respectively, related to the DARPA grant. ApolloBio Corporation On December 29, 2017, the Company entered into an Amended and Restated License and Collaboration Agreement, or the ApolloBio Agreement, with ApolloBio Corporation, or ApolloBio. Under the terms of the ApolloBio Agreement, the Company has granted to ApolloBio the exclusive right to develop and commercialize VGX-3100, its DNA immunotherapy product designed to treat pre-cancers caused by HPV, within the territories of China, Hong Kong, Macao and Taiwan. The territory may be expanded to include Korea in the event that no patent covering VGX-3100 issues in China within the three years following the Effective Date of the ApolloBio Agreement, as defined below. Under the ApolloBio Agreement, ApolloBio will pay the Company an upfront payment of $23.0 million, and such payment is to be made within three business days following the date of approval of the ApolloBio Agreement by ApolloBio’s board of directors and shareholders, or the Effective Date, which the Company expects to occur in the first quarter of 2018. In the event that such upfront payment is not made on or before April 7, 2018, the Company has the right to terminate the Agreement in its entirety. In addition to the upfront payment, the Company is entitled to receive up to an aggregate of $20.0 million upon the achievement of specified milestones related to the regulatory approval of VGX-3100 in the United States, China and Korea. In the event that VGX-3100 is approved for marketing, the Company will be entitled to receive royalty payments based on a tiered percentage of annual net sales, with such percentage being in the low- to mid-teens, subject to reduction in the event of generic competition in a particular territory. ApolloBio’s obligation to pay royalties will continue for 10 years after the first commercial sale in a particular territory or, if later, until the expiration of the last-to-expire patent covering the licensed products in the specified territory.

Collaborative Agreements

MedImmune

On August 7, 2015, The Company entered into a license and collaboration agreement with MedImmune, the global biologics research and development arm of AstraZeneca. Under the agreement, MedImmune acquired exclusive rights to the Company's INO-3112 immunotherapy, renamed as MEDI0457, which targets cancers caused by human papillomavirus (HPV) types 16 and 18. MedImmune made an upfront payment of $27.5 million to the Company in September 2015 and has agreed to make additional future development, regulatory and commercial event based payments totaling up to $700 million. MedImmune will fund all development costs associated with INO-3112 immunotherapy. The Company is entitled to receive up to mid-single to double-digit tiered royalties on INO-3112 product sales. Within the broader collaboration, the Company and MedImunne will attempt to develop up to two additional DNA-based cancer vaccine products not included in the Company's current product pipeline, which MedImmune will have the exclusive rights to develop and commercialize. The Company has assessed event-based payments under the authoritative guidance for research and development milestones and determined that none of the event- based payments represent a milestone under the milestone method of accounting.

The Company identified the deliverables at the inception of the agreement. The Company has determined that the license to INO-3112, the license for the research collaboration products with related research and development services and the product development services for INO-3112 individually represent separate units of accounting because each deliverable has standalone basis. The Company considered the provisions of the multiple-element arrangement guidance in determining whether the deliverables outlined above have standalone basis and thus should be treated as separate units of accounting. The Company determined that the license for INO-3112, the license for the research collaboration products with related research and development services, and the product development services for INO-3112 have standalone basis and represent separate units of accounting because the rights conveyed permit MedImmune to perform all efforts necessary to complete development, commercialize and begin selling the product upon regulatory approval. In addition, MedImmune has the appropriate development, regulatory and commercial expertise with products similar to the product licensed under the agreement and has the ability to engage third parties to manufacture the product allowing MedImmune to realize the value of the license without receiving any of the remaining deliverables. MedImmune can also sublicense its license rights to third parties. Also, the Company determined that the product development services for INO-3112 represents an individual unit of accounting as MedImmune could perform such services and/or could acquire these on a separate basis. The best estimated selling prices for these units of accounting were determined based on market conditions, the terms of comparable collaborative agreements for similar technology in the pharmaceutical and biotechnology industry, the Company's pricing practices and pricing objectives and the nature of the research and development services to be provided. While market data and the cost-to-recreate method under the cost approach were considered throughout the valuation process, ultimately, the estimated selling prices of the licenses were determined utilizing two forms of the relief from royalty method under the income approach. The arrangement consideration was allocated to the deliverables based on the relative selling price method.

The amount allocable to the delivered unit or units of accounting is limited to the amount that is considered fixed and determinable and is not contingent upon the delivery of additional items or meeting other specified performance conditions. Based on the results of the Company's analysis, the $27.5 million up-front payment was allocated as follows: $15.0 million to the product license to INO-3112 and $12.5 million for the license to the research collaboration products and related research and developments services. The amount allocated to the license for INO-3112 was recognized as revenue under collaborative research and development arrangements during the year ended December 31, 2015 as this was determined to be earned upon the granting of the license and delivery of the related knowledge and data. The remaining amount related to the research collaboration products and related research and development services of $12.5 million was recognized as revenue under collaboration research and development arrangements during the quarter ended June 30, 2017, upon selection of the first research collaboration product candidate by MedImmune. The Company believes that no substantive value related to the research collaboration products license and research services was transferred to MedImmune prior to their selection of the first research collaboration product since there was no economic benefit from the research unless such product candidate was selected. Therefore, the Company believes the license for the research collaboration products was delivered and the research services were completed upon the selection of the product candidate by MedImmune in June 2017. The Company performs certain product development services for INO-3112 and is reimbursed by MedImmune for these services. The Company recognizes revenues associated with these services as revenues under collaborative arrangements as the related services are performed and according to the relative selling price method of the allocable arrangement consideration. In December 2017, the Company received a $7.0 million milestone payment from MedImmune triggered by the initiation of the Phase 2 portion of an ongoing clinical trial under the agreement. This amount was recognized in full as revenue for the year ended December 31, 2017. During the years ended December 31, 2017 and 2016, the Company recognized revenues of $22.3 million and $1.5 million from MedImmune, respectively. As of December 31, 2017 and 2016, the Company has a deferred revenue balance of $1.1 million and $13.7 million, respectively, related to the Agreement. As of December 31, 2017 and 2016, the Company had an accounts receivable balance of $1.7 million and $1.2 million, respectively, related to the collaboration agreement with MedImmune.

Roche

In September 2013, the Company entered into a Collaborative, License, and Option Agreement with Roche and received an upfront payment of $10.0 million. The parties agreed to co-develop multi-antigen DNA immunotherapies targeting prostate cancer and hepatitis B.

On November 14, 2014, Roche provided notice to the Company that it would be partially terminating the agreement with respect to the development of the Company’s DNA immunotherapy targeting prostate cancer. The termination was effective in February 2015. All of Roche’s rights to the Company’s DNA immunotherapy targeting prostate cancer, including the right to license the product to other parties, have been returned to the Company.

On July 28, 2016, Roche provided notice to the Company that it would be discontinuing the agreement and its development of INO-1800, the Company’s DNA immunotherapy against the hepatitis B virus. The termination was effective in October 2016. All of Roche’s rights to INO-1800, including the right to license the product to other parties, have been returned to the Company. In February 2017, the Company received full payment of $8.5 million from Roche for its past and future obligations associated with the termination of the agreement.

The Company identified the deliverables at the inception of the agreement. The Company determined that the license to the targets, the option right to license additional vaccines, research and development services, manufacturing and drug supply, and participation in the joint steering committee individually represented separate units of accounting because each deliverable had standalone value. The amount allocable to the delivered unit or units of accounting using the best estimated selling price was limited to the amount that was considered fixed and determinable and was not contingent upon the delivery of additional items or meeting other specified performance conditions.

Based on the results of the Company's analysis, the $10.0 million up-front payment was allocated as follows: $8.4 million to the license to the targets, $1.5 million to the option right and $155,000 to the joint steering committee obligation. The amounts allocated to the licenses for the targets was recognized as revenue in 2013 as these were determined to be earned upon the granting of the license and delivery of the related knowledge and data. The Company recognized revenues associated with research and development services and manufacturing and drug supply as revenues under collaborative arrangements as the related services were performed and according to the relative selling price method of the allocable arrangement consideration. During the years ended December 31, 2017 and 2016, the Company recognized revenues of $6.1 million and $4.9 million from Roche, respectively. As of December 31, 2017 and 2016, the Company has an accounts receivable balance of $0 and $2.4 million, respectively, related to the Roche Agreement.

DARPA- Ebola

In April 2015, the Company received a grant from the Defense Advanced Research Projects Agency ("DARPA") to lead a collaborative team to develop multiple treatment and prevention approaches against Ebola. The consortium, led by the Company, is taking a multi-faceted approach to develop products to prevent and treat Ebola infection. The award covers pre-clinical development costs as well as good manufacturing practice manufacturing costs and the Phase 1 clinical study costs. The funding period is over two years and covers a base award of $19.6 million and an option award of $24.6 million, which was exercised in September 2015. The development proposal includes a second option of $11.1 million to support additional product supply and clinical development activities. The options are contingent upon the successful completion of certain pre-clinical development milestones. During the years ended December 31, 2017 and 2016, the Company recognized revenues of $9.8 million and $22.4 million, respectively, from DARPA related to the grant. As of December 31, 2017 and 2016, the Company had a deferred revenue balance of $149,000 and $1.2 million, respectively, related to the DARPA grant. As of December 31, 2017 and 2016, the Company had an accounts receivable balance of $4.1 million and $9.2 million, respectively, related to the DARPA grant.

ApolloBio Corporation

On December 29, 2017, the Company entered into an Amended and Restated License and Collaboration Agreement, or the ApolloBio Agreement, with ApolloBio Corporation, or ApolloBio. Under the terms of the ApolloBio Agreement, the Company has granted to ApolloBio the exclusive right to develop and commercialize VGX-3100, its DNA immunotherapy product designed to treat pre-cancers caused by HPV, within the territories of China, Hong Kong, Macao and Taiwan. The territory may be expanded to include Korea in the event that no patent covering VGX-3100 issues in China within the three years following the Effective Date of the ApolloBio Agreement, as defined below.

Under the ApolloBio Agreement, ApolloBio will pay the Company an upfront payment of $23.0 million, and such payment is to be made within three business days following the date of approval of the ApolloBio Agreement by ApolloBio’s board of directors and shareholders, or the Effective Date, which the Company expects to occur in the first quarter of 2018. In the event that such upfront payment is not made on or before April 7, 2018, the Company has the right to terminate the Agreement in its entirety.

In addition to the upfront payment, the Company is entitled to receive up to an aggregate of $20.0 million upon the achievement of specified milestones related to the regulatory approval of VGX-3100 in the United States, China and Korea. In the event that VGX-3100 is approved for marketing, the Company will be entitled to receive royalty payments based on a tiered percentage of annual net sales, with such percentage being in the low- to mid-teens, subject to reduction in the event of generic competition in a particular territory. ApolloBio’s obligation to pay royalties will continue for 10 years after the first commercial sale in a particular territory or, if later, until the expiration of the last-to-expire patent covering the licensed products in the specified territory.