10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-K

(Mark One)

x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2015.

OR

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from             to             .

Commission file number: 000-21088

VICAL INCORPORATED

(Exact name of registrant as specified in its charter)

Delaware	93-0948554
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

10390 Pacific Center Court, San Diego, California	92121-4340
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code: (858) 646-1100

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Name of each exchange on which registered
Common Stock, $0.01 par value	The Nasdaq Capital Market

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.  ¨    Yes    x  No

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act.  ¨    Yes    x  No

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  x    Yes    ¨  No

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).  x    Yes    ¨  No

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.  x

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company.

Large accelerated filer	¨	Accelerated filer	x
Non-accelerated filer	¨	Smaller reporting company	¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).  ¨    Yes    x  No

The aggregate market value of the voting stock held by non-affiliates of the registrant, based upon the last sale price of the registrant’s common stock reported on the Nasdaq Global Market on June 30, 2015, was approximately $63,553,157.

The number of shares of common stock outstanding as of February 29, 2016, was 91,905,977.

Documents Incorporated by Reference:

Document	Part of Form 10-K
Proxy Statement for the Annual Meeting of Stockholders to be held May 20, 2016	Part III

VICAL INCORPORATED

FORM 10-K

INDEX

PART I.
ITEM 1.	Business	3
ITEM 1A.	Risk Factors	16
ITEM 1B.	Unresolved Staff Comments	27
ITEM 2.	Properties	27
ITEM 3.	Legal Proceedings	27
ITEM 4.	Mine Safety Disclosures	27
PART II.
ITEM 5.	Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	28
ITEM 6.	Selected Financial Data	29
ITEM 7.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	30
ITEM 7A.	Quantitative and Qualitative Disclosures About Market Risk	36
ITEM 8.	Financial Statements and Supplementary Data	38
ITEM 9.	Changes in and Disagreements With Accountants on Accounting and Financial Disclosure	62
ITEM 9A.	Controls and Procedures	62
ITEM 9B.	Other Information	64
PART III.
ITEM 10.	Directors, Executive Officers and Corporate Governance	64
ITEM 11.	Executive Compensation	64
ITEM 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	64
ITEM 13.	Certain Relationships and Related Transactions, and Director Independence	64
ITEM 14.	Principal Accounting Fees and Services	64
PART IV.
ITEM 15.	Exhibits and Financial Statement Schedules	65
Signatures		68

FORWARD-LOOKING STATEMENTS

In addition to historical information, this Annual Report on Form 10-K contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, or the Securities Act, and Section 21E of the Securities Exchange Act of 1934, as amended, or the Exchange Act, including statements regarding our business, our financial position, the research and development of biopharmaceutical products, the timing of on-going clinical trials and other statements describing our goals, expectations, intentions or beliefs. Such statements reflect our current views and assumptions and are subject to risks and uncertainties, particularly those inherent in the process of developing and commercializing biopharmaceutical products. Actual results could differ materially from those discussed in this Annual Report on Form 10-K. Factors that could cause or contribute to such differences include, but are not limited to, those identified in Item 1A entitled “Risk Factors” beginning on page 16 of this report, as well as those discussed in our other filings with the Securities and Exchange Commission, or SEC, including our Quarterly Reports on Form 10-Q. As a result, you are cautioned not to unduly rely on these forward-looking statements. We disclaim any duty to update any forward-looking statement to reflect events or circumstances that occur after the date on which such statement is made.

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PART I

ITEM 1. BUSINESS

Overview

We research and develop biopharmaceutical products, including those based on our patented DNA delivery technologies, for the prevention and treatment of serious or life-threatening diseases.

We currently have four active, independent or partnered, development programs in the area of infectious disease comprised of:

· An ongoing Phase 3 clinical trial of ASP0113 for prevention of cytomegalovirus, or CMV, reactivation in hematopoietic stem cell transplant recipients and an ongoing Phase 2 clinical trial of ASP0113 for prevention of CMV infection in kidney transplant recipients, both in collaboration with Astellas Pharma Inc., or Astellas. Astellas expects enrollment in the Phase 3 clinical trial to be completed during the third quarter of 2016. Enrollment in the Phase 2 trial was completed in May of 2015 and top-line results are expected during the third quarter of 2016;

· In June 2015, we announced top-line results from an ongoing randomized, double-blind, placebo controlled Phase 1/2 clinical study of our therapeutic genital herpes vaccine, designed to reduce viral shedding and genital herpes lesions in herpes simplex virus type 2, or HSV-2, infected patients. The trial enrolled patients across seven U.S. sites and evaluated a monovalent (gD) vaccine and a bivalent (gD + UL46) vaccine. Neither the monovalent nor bivalent vaccine met the primary endpoint (reduction of viral shedding from baseline). Patients were also followed for safety for 12 months and efficacy for nine months after their final vaccine dose. During that period we collected additional clinical efficacy data including lesion rate. We anticipate these additional results will be announced in the first quarter of 2016 and that the additional results will enable us to determine the appropriate next steps for this program.

· An ongoing Phase 1 program of VL-2397 for invasive fungal infections, including invasive Aspergillus, which are major causes of morbidity and mortality in immunocompromised patients, including transplant recipients; and

· A completed preclinical program, with an allowed investigational new drug application, or IND, using our CyMVectin™ prophylactic vaccine formulated with our proprietary Vaxfectin^® adjuvant to prevent CMV infection during pregnancy.

In addition, we have licensed complementary technologies from leading research institutions and biopharmaceutical companies.

Available Information

We were incorporated in Delaware in 1987. Our Annual Report on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, and amendments to these reports filed or furnished pursuant to Section 13(a) or 15(d) of the Exchange Act, are available free of charge on our website at www.vical.com as soon as reasonably practicable after such reports and amendments are electronically filed with or furnished to the SEC. We also make available copies of our news releases and other financial information about us on our website.

Our Core Technology

The key discovery leading to our core DNA delivery technology was that muscle tissues can take up polynucleotide genetic material, such as DNA or RNA, directly, without the use of viral components or other delivery vehicles or technologies, and subsequently express the proteins encoded by the genetic material for periods ranging from weeks to more than a year. Our approach typically involves designing and constructing closed loops of DNA called plasmids, or pDNAs. These pDNAs contain a DNA segment encoding the protein of interest, as well as short segments of DNA that control protein expression. Plasmids can be manufactured using uniform methods of fermentation and processing. This could result in faster development and production times than technologies that require development of product-specific manufacturing processes.

Since the initial discovery of our DNA delivery technology, our researchers have improved the design of our plasmids to increase efficiency of gene expression and immunogenicity. We own broad patent rights in the United States and in key foreign markets to certain non-viral polynucleotide delivery technologies. Our patents and patent applications cover, for

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example, specific DNA constructs and formulations of gene-based product candidates, methods for producing pharmaceutical-grade DNA, and several families of lipid molecules and their uses in DNA delivery. Benefits of our DNA delivery technologies may include the following, which may enable us to offer novel treatment alternatives for diseases that are currently poorly addressed:

· Broad Applicability. Our DNA delivery technologies may be useful in vaccines for infectious diseases, in which the expressed protein induces an immune response, and for therapeutic protein delivery, in which the expressed protein is a therapeutic agent;

· Convenience. Our DNA-based biopharmaceutical product candidates are intended to be administered on an outpatient basis;

· Safety. Our product candidates contain no infectious components that may cause unwanted immune responses, infections, or malignant and permanent changes in the targeted cells’ genetic makeup;

· Repeat Administration. Our product candidates contain no infectious components that may preclude multiple dosing with a single product or use in multiple products;

· Ease of Manufacturing. Our product candidates are manufactured using uniform fermentation and purification procedures; and

· Cost-Effectiveness. Our DNA delivery technologies may be more cost-effective than other approaches. They may also cause fewer potential side effects, which may reduce per patient treatment costs.

DNA Technology

Our DNA delivery technology is currently being developed by us and our partners in the area of infectious disease:

Infectious Diseases

DNA vaccines use portions of the genetic code of a pathogen to cause the host to produce proteins of the pathogen that may induce an immune response. Compared with conventional vaccines that use live, weakened, or killed pathogens to produce an immune response, this method potentially offers superior safety and ease of manufacturing, as well as convenient storage and handling characteristics. DNA vaccines have the potential to induce potent T-cell responses against target pathogens as well as trigger production of antibodies. Over the past decade, many scientific publications have documented the effectiveness of DNA vaccines in contributing to immune responses in dozens of species, including fish, nonhuman primates and humans. We believe important steps in the validation of DNA vaccines occurred in 2005 when our licensee Aqua Health received Canadian approval to market its proprietary product, Apex^®-IHN, a DNA vaccine to protect farm-raised salmon against infectious hematopoietic necrosis virus, or IHNV, and again in late 2009, when our licensee Merial received approval from the U.S. Department of Agriculture, or USDA, to sell a therapeutic DNA vaccine, ONCEPT^®, designed to aid in extending the survival time of dogs with oral melanoma.

Vaccines are generally recognized as the most cost-effective approach for infectious disease healthcare. However, the technical limitations of conventional vaccine approaches have constrained the development of effective vaccines for many diseases. Development of vaccines based on conventional methods requires significant infrastructure in research and manufacturing. In addition, the safety risks associated with certain conventional vaccine approaches may offset their potential benefits. We believe our potential vaccine products may be simpler to manufacture than vaccines made using live viruses or protein subunit approaches, including those involving mammalian, avian or insect cell, or egg-based, culture procedures. In addition, our DNA delivery technologies may accelerate certain aspects of vaccine product development such as nonclinical evaluation and manufacturing.

In the broader vaccine marketplace, it is important to note a changing dynamic. Traditionally, vaccines have been predominantly focused on the pediatric market, intended to protect children from diseases that could cause them serious harm. Today, there is a growing interest in vaccines against diseases that may affect adolescents and adults, which include both sexually transmitted diseases and infections that strike opportunistically, such as during pregnancy or in immunocompromised individuals. We believe our technologies, because of their potential safety and development timeline advantages, could be ideally suited for this new generation of vaccines.

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Manufacturing Process Development

The bacterial fermentation process typically used for DNA vaccines produces a closed loop of DNA, called a plasmid, which must include DNA sequences required in the manufacturing process. Conventional vaccine development and manufacturing methods require prolonged effort after the emergence of a new pathogen for production of even a single dose for testing. Current DNA vaccine development and manufacturing processes allow initial production of vaccines in as little as three months after selection of a gene sequence associated with a pathogen, but quantities are limited by the batch-processing capacity of available manufacturing equipment.

Business Strategy

There are three basic elements to our business strategy:

Develop Products Independently

We currently focus our resources on the independent development of infectious disease vaccines. The selection of targets for our independent development programs is driven by three key criteria: the complexity of the product development program, competition, and commercial opportunities. We intend to retain significant participation in the commercialization of any independently developed proprietary DNA vaccines and therapeutics that receive regulatory approval, although we may choose to enlist the support of partners to accelerate product development and commercialization.

Vaccines are perceived by government and medical communities as an efficient and cost-effective means of healthcare. According to the Centers for Disease Control and Prevention, or CDC, “Vaccines are among the very best protections we have against infectious diseases.” In the infectious disease area, we are currently focusing our resources on the development of DNA-based vaccines against CMV and HSV-2. We are also focusing our resources on VL-2397, a therapeutic anti-fungal product candidate we recently in-licensed from Astellas. We believe our technologies may lead to the development of novel preventive or therapeutic products for infectious disease targets. DNA vaccines may help combat diseases for which conventional vaccine methods have been unsuccessful.

Expand the Applications of Our Technologies through Strategic Collaborations

We collaborate with major pharmaceutical and biotechnology companies and government agencies, providing us access to complementary technologies or greater resources. These collaborations are intended to provide us with mutually beneficial opportunities to expand or advance our product pipeline and serve significant unmet medical needs. We license our intellectual property to other companies to leverage our technologies for applications that may not be appropriate for our independent product development.

Pursue Contract Manufacturing Opportunities

We selectively pursue contract manufacturing opportunities to leverage our infrastructure and expertise in pDNA manufacturing, to support advancement and application of our technologies by others, and to provide revenues that contribute to our independent research and development efforts.

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Product Development

We, together with our licensees and collaborators, are currently developing a number of DNA-based vaccines and other therapeutics for the prevention or treatment of infectious diseases. The table below summarizes our current independent programs and corporate and government collaborations.

Product/Concept	Intended Use	DevelopmentStatus1	Lead Developer
Independent Programs
Therapeutic and prophylactic    vaccines for HSV-2	Prevent and protect against recurring    flare-ups, reduce viral shedding and    transmission	Phase 1/2	Vical
CyMVectin™ prophylactic    vaccine for CMV	Prevent infection during pregnancy to    preclude fetal transmission	Preclinical complete	Vical
VL-2397 antifungal	Treatment of invasive fungal infections	Phase 1	Vical
Corporate Collaborations
ASP0113 therapeutic vaccine    for CMV	Protect against infection after    hematopoietic stem cell transplants	Phase 3	Astellas
ASP0113 therapeutic vaccine    for CMV	Protect against infection after solid organ    transplants	Phase 2	Astellas
ONCEPT® therapeutic cancer    vaccine encoding human    tyrosinase	Adjunct treatment to increase survival    time of  dogs with oral melanoma	Marketed in the    United States	Merial

¹ “Preclinical” indicates that a specific product candidate in a nonclinical setting has shown functional activity that is relevant to a targeted medical need, and is advancing toward initial human clinical testing. “Phase 1” clinical trials are typically conducted with a small number of patients or healthy subjects to evaluate safety, determine a safe dosage range, identify side effects, and, if possible, gain early evidence of effectiveness. “Phase 2” clinical trials are conducted with a larger group of patients to evaluate effectiveness of an investigational product for a defined patient population, and to determine common short-term side effects and risks associated with the product candidate. “Phase 3” clinical trials involve large scale, multi-center, comparative trials that are conducted with patients afflicted with a target disease to evaluate the overall benefit-risk relationship of the investigational product and to provide an adequate basis for product labeling.

Programs Targeting Infectious Diseases

Herpes Simplex Virus - 2

In December 2013, we initiated a Phase 1/2 trial of our Vaxfectin^®-formulated therapeutic vaccine for HSV-2. A total of 165 HSV-2-infected patients were enrolled in the trial. The randomized, double-blind, placebo-controlled trial evaluated safety, tolerability and efficacy in otherwise healthy HSV-2-infected patients aged 18 to 50 years who have experienced 2 to 9 genital herpes recurrences within the prior year. The trial enrolled subjects at seven U.S. clinical sites.

This trial tested the effectiveness of two HSV-2 vaccines that we are developing, a monovalent vaccine and a bivalent vaccine, by comparing the viral shedding rate prevaccination (baseline) to the viral shedding rate postvaccination of each subject. Viral shedding was measured by daily self-collected swabs that were sampled for detectable HSV-2 DNA by PCR assay. In addition to this primary efficacy endpoint, this trial also evaluated several secondary outcome measures, including genital lesion rate change from baseline, the HSV viral load (or copy numbers) from baseline, as well as the immunological responses over time from baseline.

In June 2015, we announced top-line results from the Phase 1/2 trial. Neither the monovalent nor bivalent vaccine met the primary endpoint (reduction of viral shedding from baseline). All patients were also followed for safety for 12 months and efficacy for nine months after their final vaccine dose. During that period we collected additional clinical efficacy data including lesion rate.  The bivalent vaccine continued to achieve statistically significant reductions in the clinically meaningful secondary endpoint of genital lesion rate when compared to the pre-vaccination period at the 9-month time point after the patients final dose. Neither the placebo nor the monovalent vaccine groups achieved statistical significance on this endpoint at nine months after vaccination. We are reviewing this data and the T-cell immunogenicity results with our clinical advisory board to determine the best path forward for the program.

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About HSV-2

HSV-2 is a member of the herpes virus family and is the leading cause of recurrent genital herpes worldwide. About 400 million people aged 15-49 years are living with HSV-2 worldwide, and about 20 million are newly infected every year.  About one in six adults in the United States are infected with HSV-2. Even higher infection rates are evident in developing countries, with further complications in people also infected with HIV. HSV-2 infections are permanent and result in periodic virus shedding. There is no approved vaccine for HSV-2. Although antiviral regimens have become a standard of care in developed countries, we believe their inconvenience and cumulative cost underscore the need for safe, new approaches to reducing HSV-2 lesions, shedding, and transmission.

CMV Vaccines

CMV is a ubiquitous herpes virus that can cause serious complications in two distinct patient populations: immunocompromised transplant patients and children who were congenitally infected during pregnancy. We are currently developing two CMV vaccines to address the unmet needs in each of these two populations: ASP0113 (TransVax™; in collaboration with Astellas) and CyMVectin™. ASP0113 is designed to serve the first patient population by preventing CMV reactivation or infection in transplant recipients. In 2011, we licensed the right to develop and commercialize ASP0113 to Astellas. CyMVectin™ is designed to serve the second, much larger patient population by preventing primary CMV infection during pregnancy and thereby precluding maternal-fetal CMV transmission, congenital CMV infection, and related birth defects. We believe congenital CMV represents a major commercial opportunity and could potentially lead to universal vaccination.

In 2013, our licensee, Astellas initiated two ASP0113 clinical trials including a global Phase 3 registration trial of ASP0113 in approximately 500 HCT recipients. This 1:1 randomized, double-blind, placebo-controlled trial will enroll CMV seropositive subjects undergoing HCT procedures. Randomization will be stratified by donor-recipient relatedness and donor CMV serostatus. The trial will enroll approximately 500 subjects and the primary endpoint will be a composite of overall mortality and CMV end organ disease. Treatment and follow-up for each subject will continue for one year following enrollment. During the course of the trial, an independent statistician conducted a series of futility analyses based upon viral load. The final of these analyses has now been completed and the trial continues as planned. Enrollment of the Phase 3 trial is expected to be completed in the third quarter of 2016, with top-line data expected to be available in the fourth quarter of 2017.

Astellas also initiated a Phase 2 trial of ASP0113 in approximately 140 solid organ transplant recipients. This global, randomized, double-blind, placebo-controlled trial is designed to evaluate the efficacy of ASP0113 compared to placebo as measured by the incidence of CMV viremia in CMV-seronegative subjects receiving a kidney from a CMV-seropositive donor. The study will also evaluate the safety of ASP0113 in this patient population. Follow-up for each subject will continue for one year following enrollment. Enrollment of the Phase 2 trial was completed in May of 2015. Top-line results are expected to be released in the third quarter of 2016.

Prior to licensing ASP0113 to Astellas, we completed a multicenter Phase 2 trial in 94 CMV-seropositive HCT recipients (14 donor-recipient pairs and 80 recipient-only subjects), randomized 1:1 for vaccine or placebo. Subjects enrolled were 18-65 years old  and diagnosed with selected leukemias or lymphomas. Enrollment in the trial was completed in November 2008 and a 1-year follow up was completed in November 2009. In 2010, we released 12 month post-transplant data, and showed that significant reductions were achieved for key viral reactivation metrics. The final study results were published in The Lancet Infectious Diseases in January 2012.

The U.S. Food and Drug Administration, or FDA, and European Medicines Agency has designated ASP0113 as an orphan drug for the prevention of clinically significant CMV viremia, CMV disease and associated complications in at-risk transplant populations. Orphan drug designation provides certain tax benefits for qualifying expenses in the U.S. and can result in extended marketing exclusivity both in the U.S. and Europe.

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We initially developed ASP0113 as a pathway to establish a CMV vaccine proof of concept in a relatively small patient population. We decided to specifically target patients who were susceptible to CMV reactivation in HCT patients. Therefore we designed a vaccine that would primarily induce a cellular immune response. ASP0113 is a plasmid DNA vaccine that induces both T-cell and antibody responses by expressing two antigens: pp65 and gB. The tegument protein, pp65, is a major antigen recognized by T cells in CMV-infected individuals. The gB protein is a major surface antigen of CMV and a primary target of neutralizing antibodies. The gB protein is also a major CMV antigen recognized by both CD4⁺ and CD8⁺ T cells in CMV-seropositive subjects. Induction of gB-specific T cells following DNA vaccination may provide an additional antiviral mechanism that could act to reduce CMV replication and viral loads shortly after infection. The vaccine is also formulated with poloxamer CRL1005, which has been shown in nonclinical studies by us and others to enhance gene expression and immune responses.

CyMVectin™

CMV is the most common congenital infection in the United States and a leading cause of birth defects. If a woman becomes infected with CMV for the first time during pregnancy, the manifestations of congenital infection can be very severe and there are no treatment options available. CyMVectin™ is designed to prevent CMV infection prior to pregnancy. We believe this may ultimately reduce birth defects caused by CMV.

CyMVectin™ consists of pDNA that encodes the human CMV glycoprotein B, or gB, antigen and pDNA that encodes the human CMV phosphoprotein 65, or pp65, antigen. The product is formulated with our proprietary lipid-based adjuvant Vaxfectin^®. Vaxfectin^® has been shown in clinical and/or nonclinical studies by us and others to enhance immune responses, particularly antibody responses, to expressed immunogens. A recombinant gB protein-based vaccine, developed by others, has shown some protection against maternal CMV infection in a Phase 2 clinical trial, so we believe a vaccine strategy for CMV prevention can be successful. In addition, prior maternal CMV infection is associated with a reduction of risk of congenital infection. Nonclinical studies performed in rabbit, guinea pig and mouse animal models have demonstrated the ability to induce high titers of gB-specific antibodies in animals receiving the gB plasmid. Rabbit studies of Vaxfectin^®-formulated gB pDNA demonstrated an approximately 10-fold enhancement of gB when compared to gB pDNA in phosphate-buffered saline. Similarly, mouse studies also demonstrated this added benefit of Vaxfectin^® as an adjuvant. The results of these and prior published studies provide support that immune responses can be induced by pDNA vaccination and that formulation with Vaxfectin^® enhances those immune responses. Phosphoprotein 65 is a major CMV tegument protein that is among the most widely recognized CMV antigens by both CD4+ and CD8+ T cells in CMV-seropositive subjects. Induction of pp65-specific T cells following vaccination may provide an additional antiviral mechanism that could limit the spread of CMV infection by reducing CMV replication and viral loads. A repeat dose safety study in rabbits with Vaxfectin^®-formulated gB and pp65 plasmids supports the conduct of an initial safety study in humans under an allowed IND.

About CMV

CMV infects over 50% of adults in the United States by age 50. Although most healthy people who are infected by CMV after birth are asymptomatic, CMV can affect certain high-risk groups, including immunocompromised individuals and congenitally-infected infants. Significant mortality and morbidity are observed in the immunocompromised populations, especially hematopoietic stem cell transplant, or HCT, and solid organ transplant, or SOT, recipients. In CMV-seropositive HCT recipients, the incidence of CMV reactivation in the first three months following transplantation is 50-70%, and these subjects are at increased risk for CMV end-organ disease. The incidence of CMV disease has been reduced to approximately 5% by the use of preemptive antiviral therapy, but currently available antiviral therapies are associated with drug toxicity, are costly, may lead to drug resistance and provide incomplete efficacy. Late-onset CMV reactivation may also occur after this initial period of heightened susceptibility. Despite current antiviral treatments that reduce the incidence of CMV disease, CMV-seropositive HCT recipients are still at increased risk of overall mortality as well as significant morbidities or mortalities from acute and chronic graft-versus-host disease, as well as other non-CMV infectious diseases.

Currently no vaccine is approved for the prevention of CMV infection. The only approved treatment for CMV in HCT patients is ganciclovir, although other antivirals are used off label, such as valganciclovir, foscarnet, and cidofovir. We believe a vaccine that enables the patient’s immune system to control CMV infection, thereby reducing the need for antiviral therapy, would be a valuable therapeutic option for HCT recipients. The control of CMV in immunocompromised persons is primarily associated with T-cell mediated immune responses.

CMV-seropositive HCT and SOT recipients represent important populations for the prevention of CMV reactivation and reduction in antiviral therapy. Approximately 50,000 HCTs and 100,000 SOTs are performed annually throughout the world. We believe these populations represent a significant market potential for our ASP0113 vaccine.

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CyMVectin™ was designed to prevent CMV infection prior to pregnancy. We believe this may ultimately reduce birth defects caused by CMV. In the United States, congenital infection occurs in about 1 in 150 live-born infants and results in permanent disabilities, including hearing loss, mental retardation and vision loss in approximately 5,000 children per year, and approximately 500 deaths annually. Congenital infection can also occur in CMV-seropositive women. Prior maternal CMV infection is associated with a reduction of the frequency and severity of congenital infection. Contact with infected young children is the primary source of infection for pregnant women, especially those exposed to children in daycare environments.

DNA vaccine induction of CMV-specific antibodies and T-cell responses may prevent or limit CMV infection in women during pregnancy, which could impact congenital CMV transmission and the incidence of newborns suffering from the morbidities or mortality inflicted by CMV infections. We believe that there is a significant market potential for our CyMVectin™ vaccine, as there are more than 30 million CMV seronegative women of childbearing age (10 to 49 years) in the United States.

Antifungal Program

In March 2016, we initiated a Phase 1 clinical trial of our novel antifungal candidate, VL-2397. The randomized, double-blind trial will evaluate safety, tolerability and pharmacokinetics of VL-2397 at single and multiple ascending doses in otherwise healthy volunteers at one U.S. clinical site. We intend to develop VL-2397 as a front-line therapy for invasive pulmonary aspergillosis and as part of a combination regimen for preemptive treatment of fungal infections, which may represent a meaningful commercial opportunity within the global market for systemic antifungals. The FDA recently granted us orphan drug and qualified infectious disease designation for VL-2397 for the treatment of invasive aspergillosis.

VL-2397 represents a potential new class of antifungal compound to address invasive aspergillus infections, which are major causes of morbidity and mortality in immunocompromised patients, including transplant recipients. In preclinical studies to date, it has demonstrated faster fungicidal activity than marketed drugs and activity against azole-resistant fungal pathogens. Current treatment options have limited efficacy, as approximately 50-60% of allogeneic hematopoietic stem cell transplant recipients with invasive aspergillosis infections die within 12 weeks. Over the past 30 years, only one new class of antifungal drugs (echinocandins) has been introduced.

Other Infectious Disease Programs

Ebola

In January 2015, we and AnGes MG announced a collaboration to develop and commercialize an equine polyclonal antibody therapy for patients afflicted with Ebola virus disease. We will develop and provide to AnGes a DNA vaccine encoding the glycoprotein antigen of the 2014 Zaire strain of Ebola virus, formulated with our proprietary Vaxfectin^® adjuvant. AnGes received the right to exclusively develop and commercialize the equine polyclonal antibody therapy in Japan and will be responsible for all development costs. We received an upfront payment and are eligible to receive royalties on net sales and a percentage of payments received by AnGes under any sub-licensing agreements.

Government Collaborations

We have developed several vaccines targeting other diseases including dengue, malaria, anthrax, severe acute respiratory syndrome, or SARS, West Nile virus, or WNV, and Ebola. We have performed nonclinical work and completed a Phase 1 clinical trial targeting anthrax. The Naval Medical Research Center, or NMRC, has completed a Phase 1 study of a tetravalent (serotypes 1, 2, 3, and 4) dengue DNA vaccine formulated with Vaxfectin^®. The National Institutes of Health, or NIH, has completed Phase 1 clinical trials using our vaccines targeting SARS, WNV and Ebola. Due to the lack of commercial opportunities and government funding, we do not plan on further developing these vaccines at this time.

Adjuvant Development

DNA Vaccines with Vaxfectin^®

Vaxfectin^® is our proprietary, cationic lipid formulation optimized to increase the immune response to vaccines. Vaxfectin^® formulations have demonstrated safety and adjuvant activity in pDNA vaccine applications in multiple animal models, including nonhuman primates. Studies of Vaxfectin^®-formulated pDNA vaccines against CMV and measles have shown enhanced immunogenicity in rodents and nonhuman primates. Vaxfectin^®-formulated pDNA vaccines have also been tested in approximately 120 healthy human subjects receiving influenza or dengue vaccines, and collectively, these Phase 1

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trials indicate favorable safety profiles of these vaccines. Further clinical data with Vaxfectin^®-formulated HSV-2 vaccines has been gathered during the Phase 1/2 trial mentioned above. We believe Vaxfectin^® is an important potentiator of both antibody and T-cell mediated immune responses to pDNA vaccines.

Other Vaxfectin^® Applications

In 2013, we entered into a nonexclusive license with Bristol-Myers Squibb Company, or BMS, for our patented platform DNA immunization technology and our Vaxfectin^® adjuvant for use in the production of antibodies. Under the agreement, BMS is using our technology to generate antibodies with potential therapeutic uses in humans. We also agreed to provide specified quantities of our Vaxfectin^® adjuvant to BMS from time to time.

Collaboration and Licensing Agreements

We have entered into various arrangements with corporate, academic, and government collaborators, licensors, licensees, and others. In addition to the agreements summarized below, we conduct ongoing discussions with potential collaborators, licensors and licensees.

Out-licensing

Astellas. In July 2011, we entered into license agreements with Astellas, granting Astellas exclusive, worldwide, royalty-bearing licenses under certain of the Company’s intellectual property to develop and commercialize certain products containing plasmids encoding certain forms of gB, and/or pp65, including ASP0113 but excluding CyMVectin™. Under the agreements, Astellas is responsible for the worldwide development and commercialization of products in the licensed field, at its expense, and has agreed to use commercially reasonable efforts to develop, obtain regulatory approval for and commercialize at least one licensed product for use in certain immunocompromised patients in the licensed field in the United States and certain other major markets.

Under the terms of the license agreements, Astellas paid a nonrefundable upfront license fee of $25.0 million in 2011. We received an additional $10.0 million in 2012 upon finalization of the trial design for a Phase 3 registration trial of ASP0113 in HCT recipients. We are also entitled to receive additional cash payments potentially totaling $95.0 million for achievement of certain milestones through commercial launch and to receive double-digit royalties on net sales of products, and we have an option to co-promote ASP0113 in the United States. Under the terms of a supply and services agreement entered into by us and Astellas on the same date, we agreed to perform certain development and regulatory activities, at Astellas’ expense, and to supply licensed products to Astellas, at Astellas’ expense, for use in development and initial commercialization activities in the licensed field. During the years ended December 31, 2015, 2014 and 2013, we recognized $1.8 million, $1.6 million and $0.7 million, respectively, in license revenue and $14.7 million, $13.3 million and $5.6 million, respectively, of revenue related to contract services and product delivered.

In August 2012, we amended our license and supply agreements with Astellas to, among other things, (i) extend the time period that we are obligated to supply licensed products for commercial use to Astellas, at Astellas’ expense, (ii) modify the allocation of $95.0 million of milestone payments among certain milestones through commercial launch and (iii) modify the structure of the royalties on net sales from a fixed double-digit royalty to escalating tiered double-digit royalties.

As of December 31, 2015, the aggregate potential milestone payments that we were eligible to receive under each of our out-license agreements with Astellas was equal to approximately $95.0 million. These amounts assume that all remaining milestones associated with the milestone payments are met. Because the milestones are highly contingent and we have limited control over whether the development and regulatory milestones will be achieved, we are not in a position to reasonably estimate how much, if any, of the potential milestone payments will ultimately be received, or when. Many of the milestone events are related to progress in clinical trials which will take several years to achieve.

We are also eligible to receive royalty payments under our out-license agreements based on net sales of any products which incorporate the out-licensed technology. The royalties in our out-license agreements with Astellas are based on percentages of net sales in the double-digit range. Our receipt of any royalty payments under the out-license agreements is contingent upon the licensee successfully developing and commercializing products incorporating the licensed technology, and we have limited control over our licensees’ efforts in this regard. Consequently, we are not in a position to reasonably estimate when or to what extent we will receive any royalty payments under our out-license agreements.

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Merial. In 2004, we granted an exclusive license to Merial for use of our core DNA delivery technology in a therapeutic vaccine designed to aid in extending survival time of dogs with oral melanoma. Under the agreement, Merial is responsible for research and development activities. In March 2009, Merial received approval from the USDA to market the DNA vaccine, now called ONCEPT^®. Merial pays royalties to us on sales of the vaccine.

In-licensing

Astellas. In March 2015, we entered into a license agreement with Astellas, granting us exclusive worldwide license to develop and commercialize our novel antifungal candidate, VL-2397.  As consideration for the rights under the license, we issued 861,216 shares of our common stock to Astellas and made an up-front payment of $250,000 in cash. The license agreement provides for potential development, regulatory and sales milestone payments totaling up to $99.0 million, as well as tiered single-digit royalty payments based on net sales of licensed products.  The royalty payments are subject to reduction on a country-by-country basis in certain circumstances where there is not exclusivity in the country. We are responsible for the worldwide development, manufacturing and commercialization of licensed products, at our cost, and we are required to use commercially reasonable efforts with respect to such development and commercialization activities.

The license agreement, unless terminated earlier, will continue until expiration of our royalty obligations with respect to licensed products. Either party may terminate the license agreement earlier if the other party materially breaches the agreement and does not cure the breach within a specified notice period, or upon the other party’s insolvency.  Astellas may terminate the license agreement earlier if we or any of our affiliates or sublicensees oppose or challenge any of the licensed patents. Vical may terminate the license agreement on a country-by-country basis for reasonable scientific, regulatory, commercial, financial, ethical or other reasons.

CytRx. In 2001, we entered into an exclusive agreement with CytRx Corporation, or CytRx, which grants us rights to use or sublicense CytRx’s poloxamer technology to enhance viral or non-viral delivery of polynucleotides in all nonexcluded preventive and therapeutic human and animal health applications, including CMV. In addition, the agreement permits our use of CytRx’s technology to enhance the delivery of proteins in prime-boost vaccine applications that involve the use of polynucleotides. As part of the agreement, we made a $3.8 million up-front payment and agreed to make potential future milestone and royalty payments. As of December 31, 2015, we had paid CytRx $5.3 million under the agreement.

The agreement with CytRx expires upon the expiration of our royalty obligations, unless earlier terminated as set forth in the agreement. Each party may terminate the agreement early upon the bankruptcy or insolvency of, or the material breach of the agreement by, the other party, upon prior written notice to the other party. Subject to certain conditions, we may terminate the agreement early upon prior written notice to CytRx.

City of Hope. In 2003, we licensed from the City of Hope on an exclusive basis various U.S. patents that provide protection for CMV-related polynucleotide based vaccines, including TransVax^TM and CyMVectin^TM vaccine candidates. The agreement expires upon the last to expire of the patent rights licensed by us under the agreement, unless earlier terminated as set forth in the agreement. The City of Hope may terminate the agreement early, in accordance with notice provisions set forth in the agreement, if we cease to operate, fail to make payments when due or materially breach the agreement. Subject to certain conditions, we may terminate the agreement early at any time upon prior written notice to the City of Hope. We are also obligated to pay a low double-digit percentage of any payments we receive from the sub-license of products that incorporate the licensed technology. As of December 31, 2015, we had paid the City of Hope $5.5 million under the agreement.

As of December 31, 2015, the aggregate potential milestone payments that we could be obligated to pay under our active in-license agreements with Astellas, City of Hope and CytRx, total approximately $106.1 million. These amounts assume that all remaining milestones associated with the milestone payments are met. Although we believe that some of the milestones contained in the in-license agreements may be achieved, it is highly unlikely that a significant number of them will be achieved. Because the milestones are highly contingent and we have limited control over whether the regulatory milestones will be achieved, we are not in a position to reasonably estimate how much, if any, of the potential milestone payments will ultimately be paid, or when. Additionally, under these in-license agreements, many of the milestone events are related to progress in clinical trials which will take several years to achieve.

Under these in-license agreements, we may also be obligated to pay royalties based on net sales of any products which incorporate the in-licensed technology. These royalties are based on percentages of net sales in the single digit range. We may also be obligated to make payments under our in-license agreements with the City of Hope based on amounts we receive from sub-licensees, if any. Our obligations to pay any royalty payments under our in-license agreements are contingent upon

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the successful development and commercialization of products incorporating the in-licensed technology. Before any products incorporating the in-licensed technology may be sold, such products must be approved by U.S. or foreign regulatory authorities, which will require a substantial amount of additional research and development. Even if such product candidates are advanced through clinical trials, the results of such trials may not support approval by the FDA or comparable foreign agencies. Consequently, we are not in a position to reasonably estimate when or to what extent we will be obligated to pay any royalties under our in-license agreements.

Contract Manufacturing

In April 2015, we entered into a $4.1 million contract with the IPPOX Foundation to manufacture HIV-antigen plasmid DNA as a component of vaccine regimens to be evaluated in clinical trials for the prevention of HIV infection. IPPOX is a Swiss non-profit foundation that participates in the conduct of HIV vaccine clinical trials under the auspices of the Pox-Protein Public-Private Partnership, or P5, funded by theBill & Melinda Gates Foundation and the U.S. National Institute of Allergy and Infectious Diseases, or NIAID.  These plasmids were shipped and the related revenue of $4.1 million was recognized in December 2015. This contract builds upon our 2010 agreement with IPPOX to manufacture plasmid DNA for HIV vaccine clinical trials.

Intellectual Property

Patents and other proprietary rights are essential to our business. We file patent applications to protect our technologies, inventions, and improvements to our inventions that we consider important to the development of our business. We believe we have a comprehensive patent portfolio in the United States and in key foreign markets. We also rely upon trade secrets, know-how, continuing technological innovations and licensing opportunities to develop and maintain our competitive position.

Our patents and patent applications cover, for example, specific DNA constructs and formulations of gene-based product candidates, methods for producing pharmaceutical-grade DNA, and several families of lipid molecules and their uses in DNA delivery, as described more fully below:

· Core DNA Delivery Technology. We either co-owned or had rights to issued U.S. patents covering our core DNA delivery technology, including patents on methods of administering DNA sequences for the purposes of expressing therapeutic proteins or for inducing immune responses and the administration of DNA sequences into blood vessels and the heart. These patents are now expired, but we maintain patents covering specific product applications as described below.

· Lipid Technologies. We are the sole assignee of issued U.S. patents covering numerous examples of cationic lipid compounds that are used to facilitate delivery of plasmids to some tissues. Our HSV-2 therapeutic vaccine candidate, our Vaxfectin® adjuvant, as well as our CyMVectin™ prophylactic vaccine candidate are protected in-part by lipid technology and/or lipid compound patents that extend up to March 24, 2020. Patent protection of these key lipids also has been obtained in Europe, Canada and Japan. Under the Hatch-Waxman Act, a U.S. patent term extension for up to 5 years may be available under certain conditions.

· Specific DNA Products. We have patents covering specific product applications of our technologies. To date, we have received patents in the United States, Europe, Canada and Japan, relating to codon-optimized polynucleotide-based vaccines against human CMV infection. The patents expire between December 19, 2023, and May 12, 2025. These patents further protect both our ASP0113 therapeutic vaccine candidate for CMV as well as our CyMVectin™ prophylactic vaccine candidate for CMV. Protection for our therapeutic vaccine candidate for HSV-2 is further augmented by issued patents in the U.S. and Japan and other foreign counterparts pending in Australia, Canada, and Europe, all of which will expire on July 20, 2027. These patents are co-owned with the University of Washington. Under the Hatch-Waxman Act, a U.S. patent term extension for up to 5 years may be available under certain conditions.

· Antifungal Technology. We have been granted the exclusive right to Astellas patents which claim the composition of matter of, or any method of making or using, VL-2397. All of these issued U.S. patents and foreign counterparts will expire on March 13, 2029.    

As of December 31, 2015, we were the assignee or co-assignee of 52 issued U.S. and foreign patents. We maintain our issued patents by paying maintenance fees to the patent office in each country when due. Where appropriate, we participate in legal proceedings to vigorously defend against the revocation or withdrawal of our patents. The scope and nature of these proceedings generally differ depending on the country in which they are initiated.

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As of December 31, 2015, we were also prosecuting 6 pending patent applications in the United States and in foreign countries that cover various aspects of our proprietary technologies, not including patent applications for which we are a co-assignee and that are being prosecuted by our partners.

See “Risk Factors—Our patents and proprietary rights may not provide us with any benefit and the patents of others may prevent us from commercializing our products,” and “The legal proceedings to obtain and defend patents, and litigation of third-party claims of intellectual property infringement, could require us to spend money and could impair our operations.”

Commercialization and Manufacturing

Because of the broad potential applications of our technologies, we intend to develop and commercialize products both on our own and through our collaborators and licensees. We intend to develop and commercialize products in well-defined specialty markets, including infectious diseases. Where appropriate, we intend to rely on strategic marketing and distribution alliances.

We believe our plasmids can be produced in commercial quantities through uniform methods of fermentation and processing that are applicable to all plasmids. In addition, our formulations consist of components that are synthesized chemically using traditional, readily scalable organic synthesis procedures.

We produce and supply our own plasmids for all of our research needs and clinical trials and intend to produce sufficient supplies for all foreseeable clinical investigations. Our facility received a California Food and Drug Branch manufacturing facility license and began production in 2004. We also engage in contract manufacturing of plasmid investigational products for selected clients.

Competition

We are aware of several development-stage and established enterprises, including major pharmaceutical and biotechnology firms, which are actively engaged in infectious disease vaccine research and development. These include Sanofi, Novartis, GlaxoSmithKline plc, MedImmune, Inc., a wholly owned subsidiary of AstraZeneca, Merck and Pfizer Inc., among others. We may also experience competition from companies that have acquired or may acquire technologies from companies, universities and other research institutions. These companies may develop proprietary technologies which may materially and adversely affect our business.

In addition, a number of companies are developing products to address the same diseases that we are targeting. For example, Roche, Sanofi, AiCuris GmbH & Co. KG in conjunction with Merck, Chimerix, Inc., and others have products or development programs for CMV treatment and prevention. GlaxoSmithKline plc, Genocea Biosciences, Inc., Agenus, Inc. and others have products or development programs for HSV-2 treatment. If these or any other companies develop products with efficacy or safety profiles significantly better than our products, we may not be able to commercialize our products, and sales of any of our commercialized products could be harmed.

Some of our competitors and potential competitors have substantially greater product development capabilities and financial, scientific, marketing and human resources than we do. Competitors may develop products earlier, obtain FDA approvals for products more rapidly, or develop products that are more effective than those under development by us. We will seek to expand our technological capabilities to remain competitive, however, research and development by others may render our technologies or products obsolete or noncompetitive, or result in treatments or cures superior to ours.

Our competitive position will be affected by the disease indications addressed by our product candidates and those of our competitors, the timing of market introduction for these products and the stage of development of other technologies to address these disease indications. For us and our competitors, proprietary technologies, the ability to complete clinical trials on a timely basis and with the desired results, and the ability to obtain timely regulatory approvals to market these product candidates are likely to be significant competitive factors. Other important competitive factors will include the efficacy, safety, ease of use, reliability, availability and price of products and the ability to fund operations during the period between technological conception and commercial sales.  

The FDA and other regulatory agencies may expand current requirements for public disclosure of DNA-based product development data, which may harm our competitive position with foreign and U.S. companies developing DNA-based products for similar indications.

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Government Regulation

Any products we develop will require regulatory clearances prior to clinical trials and additional regulatory approvals prior to commercialization. New gene-based products for vaccine or therapeutic applications are subject to extensive regulation by the FDA and comparable agencies in other countries. The precise regulatory requirements with which we will have to comply are uncertain at this time due to the novelty of the gene-based products and indications, or uses, that are currently under development. Our potential products will be regulated either as biological products or as drugs. In the United States, drugs are subject to regulation under the Federal Food, Drug and Cosmetic Act, or the FDC Act. Biological products, in addition to being subject to provisions of the FDC Act, are regulated in the United States under the Public Health Service Act. Both statutes and related regulations govern, among other things, testing, manufacturing, safety, efficacy, labeling, storage, record keeping, advertising, and other promotional practices.

Obtaining FDA approval is a costly and time-consuming process. Generally, FDA approval requires that preclinical studies be conducted in the laboratory and in animal model systems to gain preliminary information on efficacy and to identify any major safety concerns. The results of these studies are submitted as a part of an IND which the FDA must review and allow before human clinical trials can start. The IND includes a detailed description of the proposed clinical investigations.

A company must submit an IND for each proposed product and must conduct clinical studies to demonstrate the safety and efficacy of the product necessary to obtain FDA approval. The FDA receives reports on the progress of each phase of clinical testing and may require the modification, suspension, or termination of clinical trials if an unwarranted risk is presented to patients.

To obtain FDA approval prior to marketing a pharmaceutical product in the United States typically requires several phases of clinical trials to demonstrate the safety and efficacy of the product candidate. Clinical trials are the means by which experimental treatments are tested in humans, and are conducted following preclinical testing. Clinical trials may be conducted within the United States or in foreign countries. If clinical trials are conducted in foreign countries, the products under development as well as the trials are subject to regulations of the FDA and/or its counterparts in the other countries. Upon successful completion of clinical trials, approval to market the treatment for a particular patient population may be requested from the FDA in the United States and/or its counterparts in other countries.

Clinical trials for therapeutic products are normally done in three phases. Phase 1 clinical trials are typically conducted with a small number of patients or healthy subjects to evaluate safety, determine a safe dosage range, identify side effects, and, if possible, gain early evidence of effectiveness. Phase 2 clinical trials are conducted with a larger group of patients to evaluate effectiveness of an investigational product for a defined patient population, and to determine common short-term side effects and risks associated with the drug. Phase 3 clinical trials involve large scale, multi-center, comparative trials that are conducted to evaluate the overall benefit-risk relationship of the investigational product and to provide an adequate basis for product labeling. In some special cases where the efficacy testing of a product may present a special challenge to testing in humans, such as in the case of a vaccine to protect healthy humans from a life-threatening disease that is not a naturally occurring threat, effectiveness testing may be required in animals.

After completion of clinical trials of a new product, FDA marketing approval must be obtained. If the product is regulated as a biologic, a Biologics License Application, or BLA, is required. If the product is classified as a new drug, a New Drug Application, or  NDA is required. The NDA or BLA must include results of product development activities, preclinical studies, and clinical trials in addition to detailed chemistry, manufacturing and control information.

Applications submitted to the FDA are subject to an unpredictable and potentially prolonged approval process. Despite good-faith communication and collaboration between the applicant and the FDA during the development process, the FDA may ultimately decide, upon final review of the data, that the application does not satisfy its criteria for approval or requires additional product development or further preclinical or clinical studies. Even if FDA regulatory clearances are obtained, a marketed product is subject to continual review, and later discovery of previously unknown problems or failure to comply with the applicable regulatory requirements may result in restrictions on the marketing of a product or withdrawal of the product from the market as well as possible civil or criminal sanctions.

Before marketing clearance for a product can be secured, the facility in which the product is manufactured must be inspected by the FDA and must comply with the FDA’s current Good Manufacturing Practices, or cGMP, regulations. In addition, after marketing clearance is secured, the manufacturing facility must be inspected periodically for cGMP compliance by FDA inspectors, and, if the facility is located in California, by inspectors from the Food and Drug Branch of the California Department of Health Services.

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In addition to the FDA requirements, the NIH has established guidelines for research involving human genetic materials, including recombinant DNA molecules. The FDA cooperates in the enforcement of these guidelines, which apply to all recombinant DNA research that is conducted at facilities supported by the NIH, including proposals to conduct clinical research involving gene therapies. The NIH review of clinical trial proposals and safety information is a public process and often involves review and approval by the Recombinant DNA Advisory Committee of the NIH.

Sponsors of clinical trials are required to register, and report results for, all controlled, clinical investigations, other than Phase 1 investigations, of a product subject to FDA regulation. Trial registration may require public disclosure of confidential commercial development data resulting in the loss of competitive secrets, which could be commercially detrimental.

We also are subject to various federal, state and local laws, regulations, and recommendations relating to safe working conditions, laboratory and manufacturing practices, the experimental use of animals, and the use and disposal of hazardous or potentially hazardous substances, including radioactive compounds and infectious disease agents, used in connection with our research. The extent of government regulation that might result from any future legislation or administrative action cannot be accurately predicted.

Employees

As of December 31, 2015, we had 69 full-time employees, including 6 with doctorate degrees. Of these full-time employees, 52 were engaged in, or directly supporting, research and development and manufacturing activities, and 17 were in general and administrative positions. A significant number of our management and other employees have prior experience with pharmaceutical and/or biotechnology companies. None of our employees is covered by collective bargaining agreements, and our management considers relations with our employees to be good.

Executive Officers of the Registrant

Our executive officers and other executives are as follows:

Name	Age1	Position
Vijay B. Samant2	63	President, Chief Executive Officer and Director
Mammen P. Mammen, Jr., M.D.	52	Vice President, Clinical Vaccines
Anthony A. Ramos	49	Vice President Finance, Chief Accounting Officer
Larry R. Smith, Ph.D.	55	Vice President, Vaccine Research

¹ As of December 31, 2015.

² Executive officer.

Vijay B. Samant joined us as President and Chief Executive Officer in November 2000. Previously, he held various positions at Merck from 1977 to 2000. From 1998 to 2000, he was Chief Operating Officer of the Merck Vaccine Division. From 1990 to 1998, he served in the Merck Manufacturing Division as Vice President of Vaccine Operations, Vice President of Business Affairs and Executive Director of Materials Management. From 1977 to 1990, Mr. Samant held a variety of positions of increasing responsibility in manufacturing, process engineering, production planning and control, business development and loss prevention in several Merck operating divisions. Mr. Samant holds a bachelor’s degree in chemical engineering from the University of Bombay, India, an M.S. degree in chemical engineering from Columbia University and an S.M. degree from the Sloan School of Management at MIT. Mr. Samant currently serves on the Board of Directors for AmpliPhi Biosciences and was a member of the board of directors of Raptor Pharmaceutical Corporation from 2011 to 2014. Mr. Samant was a member of the Board of Trustees for the National Foundation for Infectious Diseases and the International Vaccine Institute in Seoul, South Korea from 2008 to 2012. Mr. Samant was also a Director of the Aeras Global TB Vaccine Foundation from 2001 to 2010.

Mammen P. Mammen, Jr., M.D., joined us as Vice President, Clinical Vaccines, in November 2012. Prior to joining us, he served as Infectious Disease Consultant and Chief, Pandemic Warning Team, U.S. Department of Defense, Fort Detrick, Maryland. From 2006 to 2010, he served as the Army’s Product Manager for vaccines in Advanced Development against dengue, hepatitis E, and HIV viruses for the U.S. Army Medical Research and Materiel Command, Fort Detrick, Maryland. As Chief, Department of Virology, the Armed Forces Research Institute of Medical Sciences, Thailand, from 2001 to 2006, Dr. Mammen managed a number of the Army’s FDA-regulated vaccine studies. Dr. Mammen received his M.D. degree from the Pennsylvania State University College of Medicine and is Board-certified in Infectious Diseases. He has been elected as

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Fellow by the Infectious Disease Society of America and the American College of Physicians. He received his Internal Medicine and Infectious Disease clinical training from the Walter Reed Army Medical Center. He earned a B.A. degree in mathematics from Williams College. Dr. Mammen has authored or co-authored nearly 50 scientific publications spanning multiple emerging and re-emerging infectious diseases.

Anthony A. Ramos joined us as Corporate Controller in February 2005 and was named Chief Accounting Officer in July 2010 and Vice President of Finance in December 2013. From January 1999 until joining Vical, Mr. Ramos held various positions at Copper Mountain Networks, Inc., a publicly held network communications company, most recently as Vice President of Finance with broad responsibilities in finance, accounting, treasury, risk management and corporate governance. From April 1996 until joining Copper Mountain Networks, Mr. Ramos was Accounting Manager at Viasat, Inc., a publicly held digital communications company, where he held accounting and financial reporting responsibilities. From January 1990 until joining Viasat, Mr. Ramos served as an audit manager at PricewaterhouseCoopers LLP, where his clients included life sciences, computer software and telecommunications companies as well as government contractors. Mr. Ramos received his bachelor’s degree in business administration and accounting from San Diego State University and is a Certified Public Accountant.

Larry R. Smith, Ph.D., joined us as Executive Director, Vaccinology in September 2003, and was named Vice President, Vaccine Research in October 2006. Prior to joining Vical, Dr. Smith was Director of Viral Vaccines Research at Wyeth Vaccines, where he oversaw the immunogenicity testing of various viral vaccines including a number of recombinant viral vectors. Prior to joining Wyeth in 1996, Dr. Smith was a Scientific Investigator at Immune Response, where he identified autoreactive T-cell targets in psoriasis and multiple sclerosis which led to the clinical testing of several therapeutic vaccine candidates. Dr. Smith received a B.S. degree in biology from Purdue University, a Ph.D. in microbiology and immunology from the University of Texas Medical Branch, and was a postdoctoral fellow in the Immunology Department at Scripps Clinic and Research Foundation.

ITEM 1A. RISK FACTORS

You should consider carefully the risks described below, together with all of the other information included in this Annual Report on Form 10-K, and in our other filings with the SEC, before deciding whether to invest in or continue to hold our common stock. The risks described below are all material risks currently known, expected or reasonably foreseeable by us. If any of these risks actually occur, our business, financial condition, results of operations or cash flow could be seriously harmed. This could cause the trading price of our common stock to decline, resulting in a loss of all or part of your investment.

None of our independently developed product candidates has been approved for sale, and we have a limited number of independently developed product candidates in clinical trials. If we do not develop commercially successful products, we may be forced to curtail or cease operations.

All of our independently developed product candidates are either in research or development. We must conduct a substantial amount of additional research and development before any U.S. or foreign regulatory authority will approve any of our product candidates. Limited data exist regarding the efficacy of DNA vaccines or therapeutics compared with conventional vaccines or therapeutics. Results of our research and development activities may indicate that our product candidates are unsafe or ineffective. In this case, we may stop development and regulatory authorities will not approve them. For example, in 2013 we ceased development of Allovectin^®, an investigational intratumoral cancer immunotherapy, following negative results from a Phase 3 trial.

In June 2015, we announced top-line results from an ongoing randomized, double-blind, placebo controlled Phase 1/2 clinical study of our therapeutic genital herpes vaccine, designed to reduce viral shedding and genital herpes lesions in HSV-2 infected patients. The trial enrolled patients across seven U.S. sites and evaluated a monovalent (gD) vaccine and a bivalent (gD + UL46) vaccine. Neither the monovalent nor bivalent vaccine met the primary endpoint (reduction of viral shedding from baseline). The trial was completed in February 2016 and all patients were followed for safety for 12 months and efficacy for nine months after their final vaccine dose. .  The bivalent vaccine continued to achieve statistically significant reductions in the clinically meaningful secondary endpoint of genital lesion rate when compared to the pre-vaccination period at the 9-month time point after the patients final dose. Neither the placebo nor the monovalent vaccine groups achieved statistical significance on this endpoint at nine months after vaccination. We are reviewing this data and the T-cell immunogenicity results with our clinical advisory board to determine the best path forward for the program.We may decide to cease further clinical development of this vaccine candidate which would reduce the number of development programs and limit our future growth prospects.

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In March 2016, we initiated a Phase 1 clinical trial of ournovel antifungal, VL-2397.The Phase 1 clinical trial and any future trials, if any, may not demonstrate sufficient safety or efficacy to support further product development. Because we have a limited number of independent clinical-stage product candidates, if we experience a significant delay, set-back or failure in the development of any of our product candidates, it could have a material adverse impact on our business prospects.

All of our product candidates we are developing independently will require significant costs to advance through the development stages. If such product candidates are advanced through clinical trials, the results of such trials may not support approval by the FDA or comparable foreign agencies. Even if approved, our products may not be commercially successful, particularly if they do not gain market acceptance among physicians, patients, healthcare payers and relevant medical communities. If we fail to develop and commercialize our product candidates, we may be forced to curtail or cease operations.

Our clinical trials or those of our partners may fail to demonstrate adequately the safety and efficacy of any of our product candidates, which would prevent or delay regulatory approval and commercialization.

Before obtaining regulatory approvals for the commercial sale of our product candidates, we must demonstrate through lengthy, complex and expensive preclinical testing and clinical trials that our product candidates are both safe and effective for use in each target indication. Clinical testing is expensive and can take many years to complete, and its outcome is inherently uncertain. Failure can occur at any time during the clinical trial process. The results of preclinical studies and early clinical trials of our product candidates may not be predictive of the results of later-stage clinical trials. There is typically an extremely high rate of attrition from the failure of product candidates proceeding through clinical trials. Product candidates in later stages of clinical trials may fail to show the desired safety and efficacy profile despite having progressed through preclinical studies and initial clinical trials. We and our licensees have in the past suffered significant setbacks in advanced clinical trials due to lack of efficacy, notwithstanding promising results in earlier trials. For example, in 2013 we ceased development of Allovectin^®, an investigational intratumoral cancer immunotherapy, following negative results from a Phase 3 trial. In June 2015, we announced that our HSV-2 product candidates did not meet the primary endpoint in a Phase 1/2 clinical study. This may lead us to cease development of our HSV-2 product candidates. Most product candidates that commence clinical trials are never approved as products.

There are a number of factors that could cause a clinical study to fail or be delayed, including:

· the clinical study may produce negative or inconclusive results;

· regulators, monitoring boards or other entities may require that we hold, suspend or terminate clinical research for safety, ethical or regulatory reasons, including adverse events reported during the trial;

· we may decide, or regulators may require us, to conduct additional preclinical testing or clinical studies;

· enrollment in our clinical studies may be slower than we anticipate;

· the cost of our clinical studies may be greater than we anticipate; and

· the supply or quality of our product candidates or other materials necessary to conduct our clinical studies may be insufficient, inadequate or delayed.

In addition, even if clinical trials are successfully completed, we cannot guarantee that the FDA or foreign regulatory authorities will interpret the results as sufficient to demonstrate that a product is safe and efficacious, and more trials could be required before we submit our product candidates for approval. To the extent that the results of the trials are not satisfactory to the FDA or foreign regulatory authorities for support of a marketing application, approval of our product candidates may be significantly delayed, or we may be required to expend significant additional resources, which may not be available to us, to conduct additional trials in support of potential approval of our product candidates.

We are dependent on our out-license agreements with Astellas to further develop and commercialize ASP0113. The failure to maintain these agreements, or the failure of Astellas to perform its obligations under these agreements, could negatively impact our business.

Pursuant to the terms of our out-license agreements with Astellas, we granted to Astellas exclusive worldwide rights to develop and commercialize certain products, including ASP0113 but excluding CyMVectin™, for the control and prevention of CMV infection in immunocompromised patients, including transplant recipients and transplant donors, and pursuant to the terms of our supply and services agreement with Astellas, we are obligated to perform certain development activities and

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supply Astellas with its product requirements for development and initial commercialization activities. Consequently, our ability to generate any revenues from ASP0113 depends on Astellas’ ability to develop, obtain regulatory approvals for and successfully commercialize ASP0113. We have limited control over the amount and timing of resources that Astellas will dedicate to these efforts.

We are subject to a number of other risks associated with our dependence on our out-license agreements with Astellas, including:

· Astellas may not comply with applicable regulatory guidelines with respect to developing or commercializing ASP0113, which could adversely impact sales or future development of ASP0113;

· We and Astellas could disagree as to future development plans and Astellas may delay, fail to commence or stop future clinical trials or other development;

· There may be disputes between us and Astellas, including disagreements regarding the license agreements, that may result in (1) the delay of or failure to achieve developmental, regulatory and commercial objectives that would result in milestone or royalty payments, (2) the delay or termination of any future development or commercialization of ASP0113, and/or (3) costly litigation or arbitration that diverts our management’s attention and resources;

· Astellas may not provide us with timely and accurate information regarding development, sales and marketing activities or supply forecasts, which could adversely impact our ability to comply with our service and supply obligations to Astellas and manage our own inventory of ASP0113, as well as our ability to generate accurate financial forecasts;

· Business combinations or significant changes in Astellas’ business strategy may adversely affect Astellas’ ability or willingness to perform its obligations under our license agreements;

· Astellas may not properly defend our intellectual property rights, or may use our proprietary information in such a way as to invite litigation that could jeopardize or invalidate our intellectual property rights or expose us to potential litigation;

· The royalties we are eligible to receive from Astellas may be reduced based upon Astellas’ and our ability to maintain or defend our intellectual property rights and the presence of generic competitors;

· Limitations on our or an acquirer’s ability to maintain or pursue development or commercialization of products that are competitive with ASP0113 could deter a potential acquisition of us that our stockholders may otherwise view as beneficial; and

· If Astellas is unsuccessful in developing, obtaining regulatory approvals for or commercializing ASP0113, we may not receive any additional milestone or royalty payments under the license agreements and our business prospects and financial results may be materially harmed.

The out-license agreements and supply and services agreement are subject to early termination, including through Astellas’ right to terminate upon advance notice to us if Astellas reasonably determines that further development and/or commercialization will not be beneficial for Astellas. If the agreements are terminated early, we may not be able to find another collaborator for the commercialization and further development of ASP0113 on acceptable terms, or at all, and we may be unable to pursue continued development or commercialization of ASP0113 on our own.

Our revenues partially depend on the development and commercialization of products in collaboration with others to whom we have licensed our technologies. If our other collaborators or licensees do not successfully develop and commercialize products covered by these arrangements, or if we are unable to find collaborators or licensees in the future, we may not be able to derive revenues from these arrangements, we may lose opportunities to validate our DNA delivery technologies, or we may be forced to curtail our development and commercialization efforts in these areas.

In addition to our out-license agreements with Astellas, we have licensed, and may continue to license, our technologies to corporate collaborators and licensees for the research, development and commercialization of specified product candidates. Our revenues partially depend upon the ability of these collaborators and licensees to successfully develop and commercialize products covered by these arrangements. In addition, our licensee Astellas has product candidates in advanced stages of clinical development, for which we believe regulatory approval would provide important further validation of our DNA delivery technologies. The development and commercialization efforts of our collaborators and licensees are subject to the same risks and uncertainties described above with respect to our independently developed product candidates.

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Some collaborators or licensees may not succeed in their product development efforts. It is possible that our collaborators or licensees may be unable to obtain regulatory approval of product candidates using our technologies or successfully market and commercialize any such products for which regulatory approval is obtained. Other collaborators or licensees may not devote sufficient time or resources to the programs covered by these arrangements, and we may have limited or no control over the time or resources allocated by these collaborators or licensees to these programs. The occurrence of any of these events may cause us to derive little or no revenue from these arrangements, lose opportunities to validate our DNA delivery technologies, or force us to curtail or cease our development and commercialization efforts in these areas.

Our collaborators and licensees may breach or terminate their agreements with us, including some that may terminate their agreements without cause at any time subject to certain prior written notice requirements, and we may be unsuccessful in entering into and maintaining other collaborative arrangements for the development and commercialization of products using our technologies. If we are unable to maintain existing collaboration arrangements or enter into new ones, our ability to generate licensing, milestone or royalty revenues would be materially impaired.

Some of our independent product candidates and some of those under development by our sublicensees incorporate technologies we have licensed from others. If we are unable to retain rights to use these technologies, we or our sublicensees may not be able to market products incorporating these technologies on a commercially feasible basis, if at all.

We have licensed certain technologies from corporate collaborators and research institutions, and sublicensed certain of such technologies to others, for use in the research, development and commercialization of product candidates. Our product development efforts and those of our sublicensees partially depend upon continued access to these technologies. For example, we or our licensors may breach or terminate our agreements, or disagree on interpretations of those agreements, which could prevent continued access to these technologies. If we were unable to resolve such matters on satisfactory terms, or at all, we or our sublicensees may be unable to develop and commercialize our products, and we may be forced to curtail or cease operations.

We licensed rights to patents and know-how for VL-2397 from Astellas pursuant to an in-license agreement that contains obligations to pay Astellas regulatory and sales milestone payments relating to VL-2397, as well as royalties on net sales of VL-2397.  If we fail to make a required payment to Astellas or otherwise materially breach our in-license agreement with Astellas and do not cure the failure within the required time period, Astellas may be able to terminate the license to the VL-2397 patents and know-how, which would have a material adverse effect on our business, financial condition and results of operations.

We have a history of net losses. We expect to continue to incur net losses and we may not achieve or maintain profitability.

To date, we have not sold, or received approval to sell, any pharmaceutical products. We do not expect to sell any pharmaceutical products for at least the next several years. Our net losses were approximately $9.2 million, $16.5 million and $31.2 million for the years ended December 31, 2015, 2014 and 2013, respectively. As of December 31, 2015, we had incurred cumulative net losses totaling approximately $404.9 million. Moreover, we expect that our net losses will continue and may increase for the foreseeable future. We may not be able to achieve projected results if we generate lower revenues or receive lower investment income than expected, or we incur greater expenses than expected, or all of the above. Currently our revenues are largely dependent on manufacturing and research services performed under our license agreement with Astellas. That revenue may decrease once the ASP0113 trials are complete or in the event that the development of the ASP0113 program ceases.  We may never generate sufficient product revenue to become profitable. We also expect to have quarter-to-quarter fluctuations in revenues, expenses, and losses, some of which could be significant.

We may need additional capital in the future. If additional capital is not available, we may have to curtail or cease operations.

We may need to raise more money to continue the research and development necessary to bring our products to market and to establish marketing and additional manufacturing capabilities. We may seek additional funds through public and private stock offerings, government contracts and grants, arrangements with corporate collaborators, borrowings under lines of credit or other sources. We currently have on file a shelf registration statement that allows us to raise up to an aggregate of $100.0 million from the sale of common stock, preferred stock, debt securities and/or warrants. However, we may not be able to raise additional funds on favorable terms, or at all. Conditions in the credit markets and the financial services industry may

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make equity and debt financing more difficult to obtain, and may negatively impact our ability to complete financing transactions. To the extent that we raise additional funds by issuing equity securities, our stockholders may experience significant dilution. Any debt financing, if available, may involve restrictive covenants, such as limitations on our ability to incur additional indebtedness and other operating restrictions that could adversely impact our ability to conduct our business.

If we are unable to obtain additional funds, we may have to scale back our development of new products, reduce our workforce or license to others products or technologies that we otherwise would seek to commercialize ourselves. The amount of money we may need would depend on many factors, including:

· The progress of our research and development programs;

· The scope and results of our preclinical studies and clinical trials;

· The amount of our legal expenses, including those expenses associated with the shareholder class action filed against us and certain of our current and former officers and any settlement or damages payments associated with litigation; and

· The time and costs involved in: obtaining necessary regulatory approvals; filing, prosecuting and enforcing patent claims; scaling up our manufacturing capabilities; and the commercial arrangements we may establish.

The regulatory approval process is expensive, time consuming and uncertain, which may prevent us and our collaborators and licensees from obtaining required approvals for the commercialization of our products.

Our product candidates under development and those of our collaborators and licensees, including Astellas, are subject to extensive and rigorous regulations by numerous governmental authorities in the United States and other countries. The regulatory approval process takes many years and will require us to expend substantial resources.

U.S. or foreign regulations evolve and could prevent or delay regulatory approval of our products or limit our and our collaborators and licensees’ ability to develop and commercialize our products. Delays could:

· Impose costly procedures on our activities and those of our collaborators and licensees;

· Delay or prevent our receipt of developmental or commercial milestones from our collaborators and licensees;

· Diminish any competitive advantages that we or our products attain; or

· Otherwise negatively affect our results of operations and cash flows.

We have no experience in filing a BLA or an NDA with the FDA. Because these applications must be submitted to and approved by the FDA before any of our product candidates may be commercialized, our lack of experience may impede our ability to obtain FDA approval in a timely manner, if at all, which in turn would delay or prevent us from commercializing those products. Similarly, our lack of experience with respect to obtaining regulatory approvals in countries other than the United States may impede our ability to commercialize our products in those countries.

The FDA and comparable foreign regulatory bodies will regulate separately each product containing a particular gene depending on its intended use. Presently, to commercialize any product we and our collaborators and licensees must file a regulatory application for each proposed use. We and our collaborators and licensees must conduct clinical studies to demonstrate the safety and efficacy of the product necessary to obtain FDA or foreign regulatory authority approval. The results obtained so far in our clinical trials and those of our collaborators and licensees may not be replicated in ongoing or future trials, or the results may be subject to varying interpretation on whether they are sufficient to support approval for commercialization. This may prevent any of our product candidates from receiving approval for commercial sale.

We anticipate that we would commercially manufacture any of our product candidates that are approved for marketing. Therefore, our manufacturing facilities will have to be approved by the FDA pursuant to inspections conducted after we submit an application for regulatory approval. If we cannot successfully manufacture material that conforms to applicable specifications and the strict regulatory requirements of the FDA, we will not be able to secure and/or maintain regulatory approval for our manufacturing facilities. If the FDA does not approve our facilities for the manufacture of our product candidates or if it withdraws any such approval in the future, our ability to develop, obtain regulatory approval for or market our product candidates will be adversely affected.

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If any of our product candidates receive regulatory approval, the FDA or other foreign regulatory agencies may still impose significant restrictions on the indicated uses or marketing of our product candidates or impose ongoing requirements for potentially costly post-approval studies. In addition, regulatory agencies subject a product, its manufacturer and the manufacturer’s facilities to continual review and periodic inspections. If a regulatory agency discovers previously unknown problems with a product or a product class, including adverse events of unanticipated severity or frequency, or problems with the facility where the product is manufactured, a regulatory agency may impose restrictions on that product or product class, our collaborators and licensees or us, including requiring withdrawal of a product from the market. Our product candidates will also be subject to ongoing FDA and other foreign regulatory agency requirements for the labeling, packaging, storage, advertising, promotion, record-keeping and submission of safety and other post-market information on the product. If we or our collaborators and licensees fail to maintain regulatory compliance after receiving marketing approval, we or our collaborators and licensees may be unable to market our products and our business could suffer.

Adverse events or the perception of adverse events in the field of gene therapy, or with respect to our product candidates, may negatively impact regulatory approval or public perception of our products.

The commercial success of some of our product candidates will depend in part on public acceptance of the use of gene therapy for preventing or treating human diseases. Serious adverse events, including patient deaths, have occurred in clinical trials utilizing viral delivery systems to deliver therapeutic genes to the patient’s targeted cells. Although none of our current products or studies utilize viral delivery systems, these adverse events, as well as any other adverse events in the field of gene therapy that may occur in the future, may negatively influence public perception of gene therapy in general. If public perception is influenced by claims that gene therapy is unsafe, our product candidates may not be accepted by the general public or the medical community.

Future adverse events in gene therapy or the biotechnology industry could also result in greater governmental regulation, stricter labeling requirements and potential regulatory delays in the testing or approval of our potential products. Any increased scrutiny could delay or increase the costs of our product development efforts or clinical trials. In addition, any adverse events that may occur in our clinical trials and any resulting publicity may cause regulatory delays or otherwise affect our product development efforts or clinical trials.

Some of our potential products may be administered to patients who are suffering from, or are vulnerable to, serious diseases or other conditions which can themselves be life-threatening and often result in the death of the patient. Patient deaths in our clinical trials, even if caused by pre-existing diseases or conditions, could negatively affect the perception of our product candidates. In addition, although we do not believe our vaccine candidates could cause the diseases they are designed to protect against, a temporal relationship between vaccination and disease onset could be perceived as causal. Some of our products are designed to stimulate immune responses, and those responses, if particularly strong or uncontrolled, could result in local or systemic adverse events, including latent adverse events.

Our patents and proprietary rights may not provide us with any benefit and the patents of others may prevent us from commercializing our products.

As of December 31, 2015, we were the assignee or co-assignee of 52 issued U.S. and foreign patents. We maintain our issued patents by paying maintenance fees to the patent office in each country when due. Where appropriate, we participate in legal proceedings to vigorously defend against the revocation or withdrawal of our patents. The scope and nature of these proceedings generally differ depending on the country in which they are initiated. If we are not successful in defending our patents, we may lose all or part of our proprietary rights related to those patents in these geographic regions.

As of December 31, 2015, we were also prosecuting 6 pending patent applications in the United States and in foreign countries that cover various aspects of our proprietary technologies, not including patent applications for which we are a co-assignee and that are being prosecuted by our partners.

We may not receive any patents from our current patent applications. Issued patents provide exclusivity for only a limited time period, after which they no longer serve to protect proprietary technologies or to provide any commercial advantage. Moreover, if patents are issued to us, governmental authorities may not allow claims sufficient to protect our technologies and products. Others may also challenge or seek to circumvent or invalidate our patents. In that event, the rights granted under our patents may be inadequate to protect our proprietary technologies or to provide any commercial advantage.

In addition, the Leahy-Smith America Invents Act, or AIA, was signed into law on September 16, 2011, and significantly changed certain aspects of the United States patent laws. These changes include, but are not limited to,

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authorizing fee setting authority to the United States Patent Office, transitioning the United States to a first-inventor-to-file patent system, expanding the scope of prior art that may be utilized against a pending patent application, and adding post-patent grant proceedings before the Patent Office in which third parties may challenge the validity of the granted patent. It is not clear, what, if any, impact the AIA will have on the cost of prosecuting our patent applications, our ability to obtain patents based on our patent applications, and our ability to enforce or defend our issued or granted United States patents. An inability to obtain, enforce, and defend patents covering our proprietary technologies would materially and adversely affect our business prospects and financial condition.

Some components of our gene-based product candidates are, or may become, patented by others. As a result, we may be required to obtain licenses to conduct research, to manufacture, or to market such products. Licenses may not be available on commercially reasonable terms, or at all, which may impede our ability to commercialize our products.

The legal proceedings to obtain and defend patents, and litigation of third-party claims of intellectual property infringement, could require us to spend money and could impair our operations.

Our and our collaborators’, including Astellas’, success will depend in part on our, or our collaborators’, ability to obtain patent protection for our products and processes, both in the United States and in other countries. The patent positions of biotechnology and pharmaceutical companies, however, can be highly uncertain and involve complex legal and factual questions. Therefore, it is difficult to predict the breadth of claims allowed in the biotechnology and pharmaceutical fields.

We also rely on confidentiality agreements with our corporate collaborators, employees, consultants and certain contractors to protect our proprietary technologies. However, these agreements may be breached and we may not have adequate remedies for such breaches. In addition, our trade secrets may otherwise become known or independently discovered by our competitors.

Protecting intellectual property rights can be very expensive. Litigation may be necessary to enforce patents issued to us or to determine the scope and validity of third-party proprietary rights. If we or, as applicable, our commercialization partners, including Astellas pursuant to its first right to enforce patents licensed to it under our license agreements, choose to go to court to stop someone else from using our inventions, that individual or company has the right to ask the court to rule that the underlying patents are invalid and/or should not be enforced against that third party. Moreover, if a competitor were to file a patent application claiming technology also invented by us or our collaborators or licensees, we would have to participate in an interference proceeding before the U.S. Patent and Trademark Office to determine the priority of the invention. We or our collaborators or licensees may be drawn into interferences with third parties or may have to provoke interferences ourselves to unblock third-party patent rights to allow us or our collaborators or licensees to commercialize products based on our technologies. Litigation could result in substantial costs and the diversion of management’s efforts regardless of the results of the litigation. An unfavorable result in litigation could subject us to significant liabilities to third parties, require disputed rights to be licensed or require us to cease using some technologies.

Our products and processes may infringe, or be found to infringe, patents not owned or controlled by us. Patents held by others may require us to alter our products or processes, obtain licenses, or stop activities. If relevant claims of third-party patents are upheld as valid and enforceable, we or our collaborators or licensees could be prevented from practicing the subject matter claimed in the patents, or may be required to obtain licenses or redesign our products or processes to avoid infringement. In addition, we or our collaborators or licensees could be required to pay money damages. A number of genetic sequences or proteins encoded by genetic sequences that we are investigating are, or may become, patented by others. As a result, we or our collaborators or licensees may have to obtain licenses to test, use or market these products. Our business will suffer if we or our collaborators or licensees are not able to obtain licenses at all or on terms commercially reasonable to us or them and we or they are not able to redesign our products or processes to avoid infringement.

We have incurred costs in several legal proceedings involving our intellectual property rights in Europe, Japan and Canada. We may continue to incur costs to defend and prosecute patents and patent applications in these and other regions.

Competition and technological change may make our product candidates and technologies less attractive or obsolete.

We compete with companies, including major pharmaceutical and biotechnology firms that are pursuing other forms of treatment or prevention for diseases that we target. We also may experience competition from companies that have acquired or may acquire technologies from universities and other research institutions. As these companies develop their technologies, they may develop proprietary positions which may prevent us from successfully commercializing products.

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Some of our competitors are established companies with greater financial and other resources than we have. Other companies may succeed in developing products and obtaining regulatory approval from the FDA or comparable foreign agencies faster than we do, or in developing products that are more effective than ours. Research and development by others may seek to render our technologies or products obsolete or noncompetitive or result in treatments or cures superior to any therapeutics developed by us.

The internet site ClinicalTrials.gov provides public access to information on clinical trials and their results for a wide range of diseases and conditions. Future disclosures of such confidential commercial information may result in loss of advantage of competitive secrets.

If we lose our key personnel or are unable to attract and retain additional personnel, we may not be able to achieve our business objectives.

We are highly dependent on our principal scientific, manufacturing, clinical, regulatory and management personnel, including Vijay B. Samant, our President and Chief Executive Officer. The loss of the services of these individuals might significantly delay or prevent the achievement of our objectives. We do not maintain “key person” life insurance on any of our personnel. We depend on our continued ability to attract, retain and motivate highly qualified management and scientific personnel. We face competition for qualified individuals from other companies, academic institutions, government entities and other organizations in attracting and retaining personnel. To pursue our product development plans, we may need to hire additional management personnel and additional scientific personnel to perform research and development, as well as additional personnel with expertise in clinical trials, government regulation and manufacturing. However, due to the reasons noted above, we may not be successful in hiring or retaining qualified personnel and therefore we may not be able to achieve our business objectives.

We have limited experience in manufacturing our product candidates in commercial quantities. We may not be able to comply with applicable manufacturing regulations or produce sufficient product for contract or commercial purposes.

The commercial manufacturing of vaccines and other biological products is a time-consuming and complex process, which must be performed in compliance with the FDA’s cGMP regulations. We may not be able to comply with the cGMP regulations, and we have in the past encountered and may in the future encounter delays, disruptions or quality control problems in our manufacturing process. In addition, we may need to complete the installation and validation of additional large-scale fermentation and related purification equipment to produce the quantities of product expected to be required for commercial purposes. We have limited experience in manufacturing at this scale. We will also depend on third parties for any commercial scale filling of product vials. Noncompliance with the cGMP regulations, the inability to complete the installation or validation of additional large-scale equipment, or other problems with our manufacturing process may limit or delay the development or commercialization of our product candidates, and cause us to breach our contract manufacturing service arrangements or our obligations under our agreements with collaborators, including our obligations under our supply and services agreement with Astellas.

We currently depend on third parties to conduct our clinical trials and may initially depend on third parties to manufacture our product candidates commercially.

We rely on third parties, including clinical research organizations, medical institutions and contract laboratories, to perform critical services for us in connection with our clinical trials. These third parties are responsible for many aspects of the trials, including finding and enrolling subjects for testing and administering the trials. Although we rely on these third parties to conduct our clinical trials, we are responsible for ensuring that each of our clinical trials is conducted in accordance with its protocol and applicable regulations, including good clinical practices established by the FDA and foreign regulatory authorities, which govern the conduct, monitoring, recording and reporting the results of clinical trials to ensure that the data and results are scientifically credible and accurate, and that trial subjects are adequately informed of the potential risks associated with participating in clinical trials. Our reliance on third parties does not relieve us of the responsibility to ensure these requirements are met. These third parties may not comply with all regulatory and contractual requirements or may not otherwise perform their services in a timely or acceptable manner, and we may need to enter into new arrangements with alternative third parties and our clinical trials may be extended, delayed or terminated. In addition, if such third parties fail to perform their obligations in compliance with our clinical trial protocols or applicable good clinical practice regulations, our clinical trials may not meet regulatory requirements or may need to be repeated, and we may not be able to obtain regulatory approval for or commercialize the product candidate being tested in such trials. These risks also apply to the development activities of our collaborators and licensees, and we do not control our collaborators’ and licensees’ research and development, clinical trials or regulatory activities.

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We may also initially depend on collaborators, licensees or other third parties to manufacture our product candidates in commercial quantities. There are a limited number of third parties that could manufacture our product candidates. We may be unable to enter into any arrangement for the commercial manufacture of our product candidates, and any arrangement we secure may not meet our requirements for manufacturing quality or quantity. Our dependence on third parties for the commercial manufacture of our product candidates may also reduce our profit margins and our ability to develop and deliver products in a timely manner.

We have no marketing or sales experience, and if we are unable to develop our own sales and marketing capability, we may not be successful in commercializing our products.

Our current strategy is to market our proprietary products directly in the United States, but we currently do not possess pharmaceutical marketing or sales capabilities. To market and sell our proprietary products, we will need to develop a sales force and a marketing group with relevant pharmaceutical industry experience, or make appropriate arrangements with strategic partners to market and sell these products. Developing a marketing and sales force is expensive and time-consuming and could delay any product launch. If we are unable to successfully employ qualified marketing and sales personnel or develop other sales and marketing capabilities, we may not be able to generate sufficient product revenue to become profitable.

Healthcare reform and restrictions on reimbursement may limit our returns on potential products.

Our ability to earn sufficient returns on our products will depend in part on how much, if any, reimbursement for our products and related treatments will be available from:

· Government health administration authorities;

· Government agencies procuring biodefense products for military or public use, including some for which we may become a sole-source vendor;

· Private health coverage insurers;

· Managed care organizations; and

· Other organizations.

If we fail to obtain appropriate reimbursement, we could be prevented from successfully commercializing our potential products. There are ongoing efforts by governmental and third-party payers to contain or reduce the costs of healthcare through various reform measures. In the United States, the Federal government passed comprehensive healthcare reform legislation in 2010. Many of the details regarding the implementation of this legislation are yet to be determined and we currently cannot predict whether or to what extent such implementation or adoption of reforms may impair our business.

Additionally, third-party payers are increasingly challenging the price of medical products and services. If purchasers or users of our products are not able to obtain adequate reimbursement for the cost of using our products, they may forego or reduce their use. Significant uncertainty exists as to the reimbursement status of newly approved healthcare products, and whether adequate third-party coverage will be available.

We use hazardous materials in our business. Any claims relating to improper handling, storage or disposal of these materials could be time consuming and costly.

Our research and development processes involve the controlled storage, use and disposal of hazardous materials and biological materials. Our hazardous materials include certain compressed gases, flammable liquids, acids and bases, and other toxic compounds. We are subject to federal, state and local regulations governing the use, manufacture, storage, handling and disposal of materials and waste products. Although we believe that our safety procedures for handling and disposing of these hazardous materials comply with the standards prescribed by law and regulation, the risk of accidental contamination or injury from hazardous materials cannot be completely eliminated. In the event of an accident, we could be held liable for any damages that result. We could incur significant costs to comply with current or future environmental laws and regulations.

We may have significant product liability exposure.

We face an inherent business risk of exposure to product liability and other claims in the event that our technologies or products are alleged to have caused harm. We also have potential liability for products manufactured by us on a contract basis

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for third parties. Although we currently maintain product liability insurance in the amount of $10 million in the aggregate plus additional coverage specific to the foreign countries where our clinical trials are being conducted, this insurance coverage may not be sufficient, and we may not be able to obtain sufficient coverage in the future at a reasonable cost. Our inability to obtain product liability insurance at an acceptable cost or to otherwise protect against potential product liability claims could prevent or inhibit the commercialization of any products developed by us or our collaborators, or our ability to manufacture products for third parties. If we are sued for any injury caused by our technologies or products, or by third-party products that we manufacture, our liability could exceed our insurance coverage and total assets.

Negative conditions in the global credit markets may impair the liquidity of a portion of our investment portfolio.

Our investment securities consist of auction rate securities, corporate debt securities and government agency securities. As of December 31, 2015, our long-term investments included a (at par value) $2.5 million auction rate security secured by municipal bonds. At December 31, 2015, the auction rate security we held maintained a Standard and Poor’s credit rating of A-. Our auction rate security is a debt instrument with a long-term maturity and with an interest rate that is reset in short intervals through auctions. The conditions in the global credit markets have prevented some investors from liquidating their holdings of auction rate securities because the amount of securities submitted for sale has exceeded the amount of purchase orders for such securities. If there is insufficient demand for the securities at the time of an auction, the auction may not be completed and the interest rates may be reset to predetermined higher rates. When auctions for these securities fail, the investments may not be readily convertible to cash until a future auction of these investments is successful or they are redeemed or mature.

Since February 2008, there has been insufficient demand at auction for our auction rate security held at December 31, 2015. As a result, this security is currently not liquid, and we could be required to hold it until it is redeemed by the issuer or to maturity. As of December 31, 2015, we had recognized $0.5 million of losses related to the auction rate security. The market value of the security has partially recovered from the lows that created the losses. As of December 31, 2015, we had recorded cumulative unrealized gains of $0.2 million. Any future decline in market value may result in additional losses being recognized.

In the event we need to access the funds that are in an illiquid state, we will not be able to do so without the possible loss of principal, until a future auction for this investment is successful or it is redeemed by the issuer or it matures. If we are unable to sell this security in the market or it is not redeemed, then we may be required to hold it to maturity.

Our stock price could continue to be highly volatile and you may not be able to resell your shares at or above the price you pay for them.

The market price of our common stock, like that of many other life sciences companies, has been and is likely to continue to be highly volatile. From January 1, 2013, to December 31, 2015, our stock price has ranged from $0.34 to $4.51. The following factors, among others, could have a significant impact on the market price of our common stock:

· The results of our preclinical studies and clinical trials or announcements regarding our plans for future studies or trials, or those of our collaborators, licensees or competitors;

· Evidence or lack of evidence of the safety or efficacy of our potential products or those of our collaborators, licensees or competitors;

· The success of our collaborators and licensees, including Astellas, in the development or commercialization of our product candidates;

· The announcement by us or our collaborators, licensees or competitors of technological innovations or new products;

· Developments concerning our patent or other proprietary rights or those of our collaborators, licensees or competitors, including litigation and challenges to our proprietary rights;

· Other developments with our collaborators or licensees, including our entry into new collaborative or licensing arrangements;

· Geopolitical developments, natural or man-made disease threats, or other events beyond our control;

· U.S. and foreign governmental regulatory actions;

· Changes or announcements in reimbursement policies;

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· Period-to-period fluctuations in our operating results;

· Market conditions for life science stocks in general;

· Changes in the collective short interest in our stock;

· Changes in estimates of our performance by securities analysts; and

· Our cash balances, need for additional capital, and access to capital.

We and certain of our current and former officers have been named as defendants in two securities class action lawsuits and we are at risk of future securities class action litigation due to our past and expected stock price volatility.

In the past, stockholders have brought securities class action litigation against a company following a decline in the market price of its securities. This risk is especially acute for us because life science companies have experienced greater than average stock price volatility in recent years and, as a result, have been subject to, on average, a greater number of securities class action claims than companies in other industries. Even if such claims are not successful, any litigation could result in substantial costs and divert our management’s attention and resources, which could have a material adverse effect on our business, operating results or financial condition.

If we fail to continue to meet all applicable Nasdaq CapitalMarket requirements, Nasdaq may delist our common stock, which could have an adverse impact on the liquidity and market price of our common stock.

Our common stock was previously listed on The Nasdaq Global Select Market, which has qualitative and quantitative listing criteria. On August 5, 2015, we received a letter from The Nasdaq Stock Market indicating that for 30 consecutive business days our common stock had not maintained a minimum closing bid price of $1.00, or Minimum Bid Price Requirement, per share as required by Nasdaq Listing Rule 5550(a)(2).   Under Nasdaq Listing Rule 5810(c)(3)(A), we were afforded an initial compliance period of 180 calendar days during which, had the closing bid price of our stock been at or above $1.00 for a minimum of ten consecutive business days, we would have regained compliance with the Minimum Bid Price Requirement and our common stock would have continued to be eligible for listing on the Nasdaq Global Select Market.

We did not achieve compliance with the Minimum Bid Price Requirement by the end of the initial compliance period on February 1, 2016.  However, because on the last day of the initial compliance period we were in compliance with the market value requirement for continued listing of our common stock on the Nasdaq Capital Market, as well as all other listing standards for initial listing of our common stock on the Nasdaq Capital Market (other than the Minimum Bid Price Requirement), and we provided written notice of our intention to cure the deficiency during a second compliance period, we transitioned our listing to the Nasdaq Capital Market and Nasdaq granted us an additional compliance period through July 31, 2016 under Nasdaq Listing Rule 5810(c)(3)(A)(ii).

While we intend to continue monitoring the closing bid price of our common stock and may, if appropriate, consider implementing available options, including a reverse stock split, to regain compliance with the Minimum Bid Price Requirement under the Nasdaq Listing Rules, if we are unable to meet any of the Nasdaq listing requirements in the future, including the Minimum Bid Price Requirement during the additional compliance period, Nasdaq could determine to delist our common stock, which could adversely affect the market liquidity and trading price of our common stock. A delisting of our common stock could also adversely affect our ability to obtain financing for the continuation of our operations and could result in the loss of confidence in our company.

Anti-takeover provisions in our charter documents and under Delaware law could make an acquisition of us, which may be beneficial to our stockholders, more difficult and may prevent attempts by our stockholders to replace or remove our current management.

Our certificate of incorporation and bylaws include anti-takeover provisions, such as a classified board of directors, a prohibition on stockholder actions by written consent, the authority of our board of directors to issue preferred stock without stockholder approval, and supermajority voting requirements for specified actions. In addition, because we are incorporated in Delaware, we are governed by the provisions of Section 203 of the Delaware General Corporation Law, which generally prohibits stockholders owning in excess of 15% of our outstanding voting stock from merging or combining with us for a period of three years. These provisions may delay or prevent an acquisition of us, even if the acquisition may be considered beneficial by some stockholders. In addition, they may discourage or prevent any attempts by our stockholders to replace or remove our current management by making it more difficult for stockholders to replace members of our board of directors, which is responsible for appointing the members of our management.

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The issuance of preferred stock could adversely affect our common stockholders.

We currently have on file a shelf registration statement that allows us to raise up to an aggregate of $100.0 million from the sale of common stock, preferred stock, debt securities and/or warrants and our restated certificate of incorporation authorizes us to issue up to 5,000,000 shares of preferred stock. The issuance of preferred stock could adversely affect the voting power of holders of our common stock, and reduce the likelihood that our common stockholders will receive dividend payments and payments upon liquidation. The issuance of preferred stock could also decrease the market price of our common stock, or have terms and conditions that could discourage a takeover or other transaction that might involve a premium price for our shares or that our stockholders might believe to be in their best interests.

ITEM 1B. UNRESOLVED STAFF COMMENTS

Not applicable.

ITEM 2. PROPERTIES

We lease approximately 68,400 square feet of manufacturing, research laboratory and office space at a single site in San Diego, California, under a lease agreement that expires in August 2017.

ITEM 3. LEGAL PROCEEDINGS

In late October and early November 2013, following our announcement of the results of our Phase 3 trial of Allovectin^® and the subsequent decline of the price of our common stock, two putative securities class action complaints were filed in the U.S. District Court for the Southern District of California against us and certain of our current and former officers. On February 26, 2014, the two cases were consolidated into one action and a lead plaintiff and lead counsel were appointed (“Consolidation Order”).  On May 12, 2014, the lead plaintiff filed a first amended consolidated complaint alleging that the defendants violated Section 10(b) and 20(a) of the Securities Exchange Act of 1934 by making materially false and misleading statements regarding our business prospects and the prospects for Allovectin^®, thereby artificially inflating the price of our common stock.  On June 9, 2014, the defendants filed a motion to dismiss the first amended complaint and a motion to strike certain allegations in the amended complaint.  On March 9, 2015, the Court granted defendants’ motion to dismiss the first amended complaint and terminated as moot defendants’ motion to strike, or Order. The lead plaintiff was granted leave to amend his first amended complaint on or before March 25, 2015. The lead plaintiff chose not to amend his complaint and instead stipulated to an entry of judgment. On April 28, 2015, the Court entered final judgment dismissing the action, or Judgment. On May 28, 2015, the lead plaintiff appealed the Judgment to the U.S. Court of Appeals for the Ninth Circuit. That same day, another group of our stockholders that had previously moved for appointment as lead plaintiff, or the Vical Investor Group, also appealed the Judgment, as well as the Consolidation Order, to the U.S. Court of Appeals for the Ninth Circuit. On August 3, 2015, the Vical Investor Group voluntarily dismissed its appeal. On October 8, 2015, the lead plaintiff-appellant filed an opening brief in support of his appeal. Defendants’ filed an answering brief on December 9, 2015. On January 27, 2016, lead plaintiff-appellant filed a motion to dismiss his appeal with prejudice, which was joined by defendants. On February 1, 2016, the Ninth Circuit granted the joint motion and dismissed the appeal.

We prosecute our intellectual property estate vigorously to obtain the broadest valid scope for our patents. Due to uncertainty of the ultimate outcome of these matters, the impact on future operating results or our financial condition is not subject to reasonable estimates.

In the ordinary course of business, we may become a party to additional lawsuits involving various matters. We are unaware of any such lawsuits presently pending against us which, individually or in the aggregate, are deemed to be material to our financial condition or results of operations.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

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PART II

ITEM 5. MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

Our common stock is listed on the Nasdaq Capital Market under the symbol VICL and until January 25, 2016 was listed on the Nasdaq Global Select Market. The following table presents quarterly information on the range of high and low sales prices for our common stock during the periods presented.

2015	High		Low
First Quarter	$	1.19	$	0.85
Second Quarter		1.55		0.68
Third Quarter		0.72		0.42
Fourth Quarter		0.54		0.34
2014	High		Low
First Quarter	$	1.79	$	1.15
Second Quarter		1.36		1.07
Third Quarter		1.39		1.09
Fourth Quarter		1.37		0.89

As of January 31, 2016, there were approximately 217 stockholders of record of our common stock and 91,852,209 shares of our common stock outstanding. We have never declared or paid any dividends and do not expect to pay any dividends in the foreseeable future. We did not repurchase any of our common stock in the fourth quarter of 2015.

Performance Graph

The following performance graph and related information shall not be deemed “soliciting material” or to be “filed” with the SEC, nor shall such information be incorporated by reference into any future filing under the Securities Act or Exchange Act, except to the extent that we specifically incorporate it by reference into such filing.

The following table compares total stockholder returns for Vical over the last five years to the Nasdaq U.S. and Foreign Index and the Nasdaq Pharmaceutical Stocks Index assuming a $100 investment made on December 31, 2010. Each of the two comparative measures of cumulative total return assumes reinvestment of dividends. The stock performance shown on the graph below is not necessarily indicative of future price performance.

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ITEM 6. SELECTED FINANCIAL DATA

The following table summarizes certain selected financial data derived from our audited financial statements. The information presented should be read in conjunction with “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our audited financial statements and notes thereto appearing elsewhere in this Annual Report on Form 10-K.

	Year Ended December 31,
	2015			2014			2013			2012			2011
	(in thousands, except per share amounts)
Statement of Operations Data:
Revenues:
Contract and grant revenue	$	18,860		$	13,304		$	5,846		$	6,176		$	4,223
License and royalty revenue		2,090			1,913			1,872			11,343			25,795
Total revenues		20,950			15,217			7,718			17,519			30,018
Operating expenses:
Research and development		11,061			11,467			14,558			17,340			17,975
Manufacturing and production		10,927			10,824			12,698			13,055			10,267
General and administrative		8,366			9,552			11,814			10,557			9,598
Total operating expenses		30,354			31,843			39,070			40,952			37,840
Loss from operations		(9,404	)		(16,626	)		(31,352	)		(23,433	)		(7,822	)
Investment and other income, net		166			134			114			534			539
Net loss		(9,238	)		(16,492	)		(31,238	)		(22,899	)	$	(7,283	)
Net loss per share (basic and diluted)	$	(0.10	)	$	(0.19	)	$	(0.36	)	$	(0.27	)	$	(0.10	)
Weighted average shares used in per share calculation		91,751			88,786			86,840			85,966			72,031
Balance Sheet Data (at end of period):
Cash, cash equivalents, marketable securities, long-term    investments, including restricted	$	42,006		$	49,123		$	55,477		$	86,082		$	56,355
Working capital		40,336			46,129			54,434			80,230			47,096
Total assets		49,914			57,979			66,353			96,522			68,773
Long-term obligations , less current portion		359			856			1,288			1,657			1,964
Total stockholders’ equity		45,393			51,922			61,412			89,086			60,348

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ITEM 7. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Overview

We research and develop biopharmaceutical products, including those based on our patented DNA delivery technologies, for the prevention and treatment of serious or life-threatening diseases.

We currently have four active, independent or partnered, development programs in the area of infectious disease comprised of:

· An ongoing Phase 3 clinical trial of ASP0113 for prevention of cytomegalovirus, or CMV, reactivation in hematopoietic stem cell transplant recipients and an ongoing Phase 2 clinical trial of ASP0113 for prevention of CMV infection in kidney transplant recipients, both in collaboration with Astellas Pharma Inc., or Astellas. Astellas expects enrollment in the Phase 3 clinical trial to be completed during the third quarter of 2016. Enrollment in the Phase 2 trial was completed in May of 2015 and top-line results are expected during the third quarter of 2016;

· In June 2015, we announced top-line results from an ongoing randomized, double-blind, placebo controlled Phase 1/2 clinical study of our therapeutic genital herpes vaccine, designed to reduce viral shedding and genital herpes lesions in herpes simplex virus type 2, or HSV-2, infected patients. The trial enrolled patients across seven U.S. sites and evaluated a monovalent (gD) vaccine and a bivalent (gD + UL46) vaccine. Neither the monovalent nor bivalent vaccine met the primary endpoint (reduction of viral shedding from baseline). Patients were also followed for safety for 12 months and efficacy for nine months after their final vaccine dose. The bivalent vaccine continued to achieve statistically significant reductions in the clinically meaningful secondary endpoint of genital lesion rate when compared to the pre-vaccination period at the 9-month time point after the patients final dose. Neither the placebo nor the monovalent vaccine groups achieved statistical significance on this endpoint at nine months after vaccination. We are reviewing this data and T-cell immunogenicity results with our clinical advisory board to determine the best path forward for the program.

· An ongoing Phase 1 program of VL-2397 for invasive fungal infections, including invasive Aspergillus, which are major causes of morbidity and mortality in immunocompromised patients, including transplant recipients; and

· A completed preclinical program, with an allowed investigational new drug application, or IND, using our CyMVectin™ prophylactic vaccine formulated with our proprietary Vaxfectin^® adjuvant to prevent CMV infection during pregnancy.

In addition, we have licensed complementary technologies from leading research institutions and biopharmaceutical companies.

Research, Development and Manufacturing Programs

To date, we have not received revenues from the sale of our independently developed pharmaceutical products and have received minimal revenues from the sale of commercially marketed products by our licensees. We earn revenues by performing services under research and development contracts, grants, manufacturing contracts, and from licensing access to our proprietary technologies. Since our inception, we have received approximately $259.6 million in revenues from these sources. Revenues by source for each of the three years ended December 31, 2015, were as follows (in millions):

Source	2015		2014		2013
Astellas contract	$	14.7	$	13.3	$	5.6
IPPOX contract		4.1		—		—
Other contracts and grants		0.1		—		0.2
Total contract and grant revenues		18.9		13.3		5.8
Astellas license		1.8		1.6		0.7
AnGes license		0.1		—		0.5
Other royalties and licenses		0.2		0.3		0.7
Total royalty and license revenues		2.1		1.9		1.9
Total revenues	$	21.0	$	15.2	$	7.7

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Research, development, manufacturing and production costs by major program, as well as other expenses for each of the three years ended December 31, 2015, were as follows (in millions):

Program	2015		2014		2013
Allovectin®		—	$	0.1	$	14.7
HSV-2		3.1		4.8		4.2
CMV		13.1		14.8		6.4
VL-2397		3.4		—		—
Other research, development, manufacturing and    production		2.4		2.6		2.0
Total research, development, manufacturing and    production	$	22.0	$	22.3	$	27.3

Since our inception through December 31, 2015, we estimate that we have spent approximately $544 million on research, development, manufacturing and production. Our current independent development focus is on a DNA vaccine for CMV, a vaccine to treat HSV-2, and other clinical and preclinical targets. These programs, excluding ASP0113 which we licensed to Astellas, will require significant additional funds to advance through development to commercialization. From inception through December 31, 2015, we have spent approximately $17 million on our HSV-2 program, $108 million on our CMV programs and $3 million on our VL-2397 program.

We have other product candidates in the research stage. It can take many years to develop product candidates from the initial decision to screen product candidates, perform preclinical and safety studies, and perform clinical trials leading up to possible approval of a product by the FDA or comparable foreign agencies. The outcome of the research is unknown until each stage of the testing is completed, up through and including the registration clinical trials. Accordingly, we are unable to predict which potential product candidates we may proceed with, the time and cost to complete development, and ultimately whether we will have a product approved by the FDA or comparable foreign agencies.

As a result, we expect to incur substantial operating losses for at least the next several years, due primarily to the advancement of our research and development programs, the cost of preclinical studies and clinical trials, spending for outside services, costs related to maintaining our intellectual property portfolio, costs due to manufacturing activities, costs related to our facilities, and possible advancement toward commercialization activities.

Critical Accounting Policies and Estimates

The preparation and presentation of financial statements in accordance with accounting principles generally accepted in the United States requires that management make a number of assumptions and informed estimates that affect the reported amounts of assets, liabilities, revenues and expenses in our financial statements and accompanying notes. Management bases its estimates on historical information and assumptions believed to be reasonable. Although these estimates are based on management’s best knowledge of current events and circumstances that may impact us in the future, they are inherently uncertain and actual results may differ materially from these estimates.

Our critical accounting policies are those that affect our financial statements materially and involve a significant level of judgment by management. Our critical accounting policies regarding revenue recognition are in the following areas: license and royalty agreements, manufacturing contracts, contract services and grant revenues. Our critical accounting policies also include recognition of research and development expenses and the valuation of long-lived and intangible assets.

Revenue Recognition

Revenue is recognized when the four basic criteria of revenue recognition are met: (1) persuasive evidence of an arrangement exists; (2) delivery has occurred or services rendered; (3) the fee is fixed or determinable; and (4) collectability is reasonably assured. Certain of our revenue is generated through manufacturing contracts and stand-alone license agreements.

We have entered into multiple-element arrangements. In order to account for the multiple-element arrangements, we identify the deliverables included within the agreement and evaluate which deliverables represent separate units of accounting. Analyzing the arrangement to identify deliverables requires the use of judgment, and each deliverable may be an obligation to deliver services, a right or license to use an asset, or another performance obligation.

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The delivered item(s) must have value to the customer on a standalone basis and, if the arrangement includes a general right of return relative to the delivered item, delivery or performance of the undelivered item(s) is considered probable and substantially in our control.

A delivered item is considered a separate unit of accounting when the delivered item has value to the partner on a standalone basis based on the consideration of the relevant facts and circumstances for each arrangement. Factors considered in this determination include the research capabilities of the partner and the availability of research expertise in this field in the general marketplace. Arrangement consideration is allocated at the inception of the agreement to all identified units of accounting based on their relative selling price. The relative selling price for each deliverable is determined using vendor specific objective evidence, or VSOE, of selling price or third-party evidence of selling price if VSOE does not exist. If neither VSOE nor third-party evidence of selling price exists, we use our best estimate of the selling price for the deliverable. The amount of allocable arrangement consideration is limited to amounts that are fixed or determinable. The consideration received is allocated among the separate units of accounting, and the applicable revenue recognition criteria are applied to each of the separate units. Changes in the allocation of the sales price between delivered and undelivered elements can impact revenue recognition but do not change the total revenue recognized under any agreement. If facts and circumstances dictate that the license has standalone value from the undelivered items, which generally include research and development services and the manufacture of drug products, the license is identified as a separate unit of accounting and the amounts allocated to the license are recognized upon the delivery of the license, assuming the other revenue recognition criteria have been met. However, if the amounts allocated to the license through the relative selling price allocation exceed the upfront license fee, the amount recognized upon the delivery of the license is limited to the upfront fee received. If facts and circumstances dictate that the license does not have standalone value, the transaction price, including any upfront license fee payments received, are allocated to the identified separate units of accounting and recognized as those items are delivered.

The terms of our license and collaboration agreements provide for milestone payments upon achievement of certain regulatory and commercial events. We recognize consideration that is contingent upon the achievement of a milestone in its entirety as revenue in the period in which the milestone is achieved only if the milestone is substantive in its entirety. A milestone is considered substantive when it meets all of the following three criteria: 1) The consideration is commensurate with either the entity’s performance to achieve the milestone or the enhancement of the value of the delivered item(s) as a result of a specific outcome resulting from the entity’s performance to achieve the milestone, 2) The consideration relates solely to past performance, and 3) The consideration is reasonable relative to all of the deliverables and payment terms within the arrangement. A milestone is defined as an event (i) that can only be achieved based in whole or in part on either the entity’s performance or on the occurrence of a specific outcome resulting from the entity’s performance, (ii) for which there is substantive uncertainty at the date the arrangement is entered into that the event will be achieved and (iii) that would result in additional payments being due to us.

Contract Services, Grant and Royalty Revenue

We recognize revenue from contract services and federal government research grants during the period in which the related expenditures are incurred and related payments for those services are received or collection is reasonably assured. Royalties to be received based on sales of licensed products by our partners incorporating our licensed technology are recognized when received.

Research and Development Expenses

Research and development expenses consist of expenses incurred in performing research and development activities including salaries and personnel-related costs, supplies and materials, outside services, costs of conducting preclinical and clinical trials, facilities costs and amortization of intangible assets. Research and development expenses are charged to operations as they are incurred.

We assess our obligations to make milestone payments that may become due for licensed or acquired technology to determine whether the payments should be expensed or capitalized. We charge milestone payments to research and development expense when:

· The technology is in the early stage of development and has no alternative uses;

· There is substantial uncertainty of the technology or product being successful;

· There will be difficulty in completing the remaining development; and

· There is substantial cost to complete the work.

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Capitalization and Valuation of Long-Lived and Intangible Assets

Intangible assets with finite useful lives consist of capitalized costs incurred in connection with patents, patent applications pending and technology license agreements. Payments to acquire a license to use a proprietary technology are capitalized if the technology is expected to have alternative future use in research and development projects. We amortize costs of approved patents, patent applications pending and license agreements over their estimated useful lives, or terms of the agreements, whichever are shorter.

For patents pending, we amortize the costs over the shorter of a period of twenty years from the date of filing the application or, if licensed, the term of the license agreement. We re-assess the useful lives of patents when they are issued, or whenever events or changes in circumstances indicate the useful lives may have changed. For patents and patent applications pending that we abandon, we charge the remaining unamortized accumulated costs to research and development expense.

Intangible assets and long-lived assets are evaluated for impairment at least annually or whenever events or changes in circumstances indicate that their carrying value may not be recoverable. If the review indicates that intangible assets or long-lived assets are not recoverable, their carrying amount would be reduced to fair value. Factors we consider important that could trigger an impairment review include the following:

· A significant change in the manner of our use of the acquired asset or the strategy for our overall business; and/or

· A significant negative industry or economic trend.

In the event we determine that the carrying value of intangible assets or long-lived assets is not recoverable based upon the existence of one or more of the above indicators of impairment, we may be required to record impairment charges for these assets. As of December 31, 2015, our largest group of intangible assets with finite lives included issued patents and patents pending for our DNA delivery technology, consisting of intangible assets with a net carrying value of approximately $1.3 million.

Recent Accounting Pronouncements

For information on the recent accounting pronouncements which may impact our business, see Note 1 of the Notes to Financial Statements included in this Annual Report on Form 10-K.

Results of Operations

Year Ended December 31, 2015, Compared to Year Ended December 31, 2014

Total Revenues. Total revenues increased $5.7 million, or 37.7%, to $20.9 million in 2015 from $15.2 million in 2014. Our contract revenue increased by $5.6 million which was primarily the result of the recognition of $4.1 million of revenue related to our contract manufacturing agreement with the IPPOX Foundation to manufacture HIV-antigen plasmid DNA. The remaining increase was primarily related to an increase in billable activities under our ASP0113 license agreement with Astellas.

Research and Development Expenses. Research and development expenses decreased $0.4 million, or 3.5%, to $11.1 million for 2015 from $11.5 million for 2014. This decrease was primarily due to a decrease in HSV-2 clinical trial costs combined with a decrease in stock-based compensation, which was partially offset by license payments made to Astellas for the in-license of VL-2397.  

Manufacturing and Production Expenses. Manufacturing and production expenses increased $0.1 million, or 1.0%, to $10.9 million for 2015 from $10.8 million for 2014. This increase was primarily due to a net increase in deferred contract costs recognized under various contract manufacturing agreements when compared to 2014.

General and Administrative Expenses. General and administrative expenses decreased $1.2 million, or 12.4%, to $8.4 million for 2015 from $9.6 million for 2014. This decrease was primarily due to a decrease in legal fees related to the recently completed securities class action litigation and a decrease in employee stock based compensation.

Investment and Other Income. Investment and other income increased $32,000, or 23.9%, to $166,000 for 2015 from $134,000 for 2014. This increase was primarily the result of an unrealized gain recognized on auction rate securities during the year ended December 31, 2015.

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Year Ended December 31, 2014, Compared to Year Ended December 31, 2013

Total Revenues. Total revenues increased $7.5 million, or 97.2%, to $15.2 million in 2014 from $7.7 million in 2013. This increase was primarily due to an increase in research work performed and materials supplied to Astellas under our ASP0113 license agreements with Astellas.

Research and Development Expenses. Research and development expenses decreased $3.1 million, or 21.2%, to $11.5 million for 2014 from $14.6 million for 2013. This decrease was primarily due to a $1.9 million restructuring charge recognized in August 2013 combined with a decrease in employee-related expenses, scientific supplies and contract services. These decreases were partially offset by an increase in clinical trial costs.

Manufacturing and Production Expenses. Manufacturing and production expenses decreased $1.9 million, or 14.8%, to $10.8 million for 2014 from $12.7 million for 2013. This decrease was primarily due to a reduction in employee-related expenses as a result of our August 2013 restructuring combined with a reduction in the purchase of scientific supplies.

General and Administrative Expenses. General and administrative expenses decreased $2.3 million, or 19.1%, to $9.6 million for 2014 from $11.8 million for 2013. This decrease was primarily due to a decrease in employee-related expenses as a result of our August 2013 restructuring.

Investment and Other Income, net. Investment and other income, net increased $20,000, or 17.5%, to $134,000 for 2014 from $114,000 for 2013.

Liquidity and Capital Resources

Since our inception, we have financed our operations primarily through private placements and public offerings of equity securities, and revenues from our operations. From our inception through December 31, 2015, we have received approximately $259.6 million in revenues from performing services under research and development and manufacturing contracts, from grants and from licensing access to our proprietary technologies, and we have raised net proceeds of approximately $425.5 million from the sale of equity securities. Cash, cash equivalents, marketable securities, and long-term investments, including restricted securities, totaled $42.0 million at December 31, 2015, compared with $49.1 million at December 31, 2014. The decrease in our cash, cash equivalents and marketable securities for the year ended December 31, 2015, was due primarily to the use of cash to fund our operations.

Net cash used in operating activities was $6.9 million and $9.8 million for the years ended December 31, 2015 and 2014, respectively. The decrease in net cash used in operating activities for the year ended December 31, 2015, compared with the prior year period, was primarily the result of a $7.3 million decrease in our net loss offset by a $3.1 million decrease in cash flows from a change in our accounts payable and accrued expenses balance when compared to 2014. The decrease in the net loss was primarily due to a $5.7 million increase in revenue recognized primarily from our manufacturing contract with the IPPOX Foundation.

Net cash used in investing activities was $0.1 million and $12.4 million for the years ended December 31, 2015 and 2014, respectively. The decrease in net cash used in investing activities for the year ended December 31, 2015, compared with the prior year, was primarily the result of an increase in maturities of marketable securities.

Net cash (used in) provided by financing activities was $(20,000) and $3.9 million for the years ended December 31, 2015 and 2014, respectively. The decrease in net cash provided by financing activities for the year ended December 31, 2015, compared with the prior year period, was the result of net proceeds received from the sale of our common stock during the year ended December 31, 2014.

A discussion of our exposure to auction rate securities is included in Part II, Item 7A of this Annual Report on Form 10-K under the heading “Quantitative and Qualitative Disclosures About Market Risk.”

In the long-term, we expect to incur substantial additional research and development expenses, manufacturing and production expenses, and general and administrative expenses, including increases in costs related to personnel, preclinical and clinical testing, outside services, facilities, intellectual property and possible commercialization. Our future capital requirements will depend on many factors, including continued scientific progress in our research and development programs, the scope and results of preclinical testing and clinical trials, the time and costs involved in obtaining regulatory approvals, the costs involved in filing, prosecuting, enforcing and defending patent claims, the impact of competing technological and market developments, the cost of manufacturing scale-up and validation, and possible commercialization

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activities and arrangements. We may seek additional funding through research and development relationships with suitable potential corporate collaborators. We may also seek additional funding through public or private financings. We currently have on file an effective shelf registration statement that allows us to raise up to $100.0 million from the sale of common stock, preferred stock, debt securities and/or warrants. However, additional financing may not be available on favorable terms or at all. If additional financing is not available, we anticipate that our available cash and existing sources of funding will be adequate to satisfy our cash needs at least through December 31, 2017.

In April 2014, we entered into an At-the-Market Issuance Sales Agreement, or ATM Agreement, with Meyers Associates, L.P. (doing business as Brinson Patrick, a division of Meyers Associates, L.P.), or Brinson Patrick, under which we could issue and sell up to $25.0 million of shares of our common stock from time to time. This agreement expired in May 2015. There were no shares sold during the year ended December 31, 2015.

Contractual Obligations and Off-Balance Sheet Arrangements

The following table sets forth our contractual obligations, including all off-balance sheet arrangements, as of December 31, 2015 (in thousands):

	Payment Due by Period
	Total		Less than 1 Year		2-3 Years		4-5 Years		After 5 Years
Contractual Obligations1
Operating lease obligations	$	6,047	$	3,614	$	2,433	$	—	$	—
Unconditional purchase obligations2		1,214		1,214		—		—		—
Total contractual obligations	$	7,261	$	4,828	$	2,433	$	—	$	—

¹ Certain long-term liabilities reflected on our balance sheet are not presented in this table because they are already reflected in operating lease commitments or do not require cash settlement in the future.

² Unconditional purchase obligations represent contractual commitments entered into for goods and services in the normal course of our business. The purchase obligations do not include potential severance payment obligations to our executive officers. For information regarding these severance arrangements, refer to the final paragraph in this Item 7.

Under our license agreements with Astellas, we are required to make certain payments to the City of Hope and CytRx in connection with the development and commercialization of our products licensed by Astellas. In addition, certain technology license agreements require us to make other payments if we or our sublicensees advance products through clinical development. For programs developed with the support of U.S. government funding, the U.S. government may have rights to resulting products without payment of royalties to us.

We may be required to make future payments to our licensors based on the achievement of milestones set forth in various in-licensing agreements. In most cases, these milestone payments are based on the achievement of development or regulatory milestones, including the exercise of options to obtain licenses related to specific disease targets, commencement of various phases of clinical trials, filing of product license applications, approval of product licenses from the FDA or a foreign regulatory agency, and the first commercial sale of a related product. Payment for the achievement of milestones under our in-license agreements is highly speculative and subject to a number of contingencies.

The aggregate amount of additional milestone payments that we could be required to pay under our active in-license agreements in place at December 31, 2015, is approximately $106.1 million. These amounts assume that all remaining milestones associated with the milestone payments are met. In the event that product license approval for any of the related products is obtained, we may be required to make royalty payments in addition to these milestone payments. Although we believe that some of the milestones contained in our in-license agreements may be achieved, it is highly unlikely that a significant number of them will be achieved. Because the milestones are contingent, we are not in a position to reasonably estimate how much, if any, of the potential milestone payments will ultimately be paid, or when. Additionally, under the in-license agreements, many of the milestone events are related to progress in clinical trials which will take several years to achieve.

In addition, we have undertaken certain commitments under license agreements with collaborators, and under indemnification agreements with our officers and directors. Under the license agreements with our collaborators, we have agreed to continue to maintain and defend the patent rights licensed to the collaborators and, in the case of our agreements with Astellas, have agreed to undertake certain development and manufacturing activities. Under the indemnification

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agreements with our officers and directors, we have agreed to indemnify those individuals for any expenses and liabilities in the event of a threatened, pending or actual investigation, lawsuit, or criminal or investigative proceeding.

We have employment agreements that contain severance arrangements with our chief executive officer, or CEO, and our three   other executives. Under the agreement with our CEO, we are obligated to pay severance if we terminate the CEO’s employment without “cause,” or if the CEO resigns for “good reason,” as defined in the agreement, within the periods set forth therein. The severance for the CEO consists of continued base salary payments at the then-current rate, including the payment of health insurance premiums for 18 months, plus a payment equal to one and one-half times the CEO’s cash bonus in the previous year. In addition, the CEO receives accelerated vesting on all his unvested stock awards as if he had remained employed by us for 18 months from the date of termination. In the event that the termination occurs within 24 months of a “change in control,” as defined in the agreement, the severance for the CEO consists of a lump sum payment equal to 24 months of base salary at the then-current rate, the payment of health insurance premiums for 18 months, plus a payment equal to one and one-half times the CEO’s cash bonus in the previous year. In addition, all outstanding unvested stock awards will vest immediately. Under the agreements with our other three executives, we are obligated to pay severance if we terminate the executive’s employment without “cause,” or if the executive resigns for “good reason,” as defined in the agreements, within the periods set forth therein. The severance for the other executives consists of a lump-sum payment equal to 12 months of base salary at the then-current rate, including the payment of health insurance premiums for 12 months, plus a payment equal to the executive’s cash bonus in the previous year. In addition, the executive receives accelerated vesting on all his unvested stock awards as if he had remained employed by us for 12 months from the date of termination. In the event that the termination occurs within 12 months of a “change in control,” as defined in the agreements, the severance for the other executives consists of a lump sum payment equal to 18 months of base salary at the then-current rate, the payment of health insurance premiums for 12 months, plus a payment equal to the executive’s cash bonus in the previous year. In addition, all outstanding unvested stock awards will vest immediately. The maximum payments due under these employment agreements would have been $3.1 million if each such officer was terminated at December 31, 2015.

ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

We are subject to interest rate risk. Our investment portfolio is maintained in accordance with our investment policy which defines allowable investments, specifies credit quality standards and limits the credit exposure of any single issuer. Our investment portfolio consists of cash equivalents, both restricted and non-restricted, marketable securities and long-term investments. The average maturity of our investments, excluding our auction rate securities, is approximately four months. Our investments are classified as available-for-sale securities.

To assess our interest rate risk, we performed a sensitivity analysis projecting an ending fair value of our cash equivalents and current marketable securities using the following assumptions: a 12-month time horizon, a 9-month average maturity and a 150-basis-point increase in interest rates. This pro forma fair value would have been $177,000 lower than the reported fair value of our investments at December 31, 2015.

Our investment securities consist of auction rate securities, corporate debt securities and government agency securities. As of December 31, 2015, our long-term investments included a (at par value) $2.5 million auction rate security secured by municipal bonds. At December 31, 2015, the auction rate security we held maintained a Standard and Poor’s credit rating of A-. Our auction rate security is a debt instrument with a long-term maturity and with an interest rate that is reset in short intervals through auctions. The conditions in the global credit markets have prevented some investors from liquidating their holdings of auction rate securities because the amount of securities submitted for sale has exceeded the amount of purchase orders for such securities. If there is insufficient demand for the securities at the time of an auction, the auction may not be completed and the interest rates may be reset to predetermined higher rates. When auctions for these securities fail, the investments may not be readily convertible to cash until a future auction of these investments is successful or they are redeemed or mature.

Since February 2008, there has been insufficient demand at auction for our auction rate security held at December 31, 2015. As a result, this security is currently not liquid, and we could be required to hold it until it is redeemed by the issuer or to maturity. As of December 31, 2015, we had recognized $0.5 million of losses related to the auction rate security by adjusting its carrying value. The market value of the security has partially recovered from the lows that created the losses. As of December 31, 2015, we had recorded cumulative unrealized gains of $0.2 million. Any future decline in market value may result in additional losses being recognized.

The valuation of our auction rate security is subject to uncertainties that are difficult to predict. The fair value of the security is estimated utilizing a discounted cash flow analysis or other type of valuation model as of December 31, 2015. The key drivers of the valuation model include the expected term, collateralization underlying the security investments, the

36

creditworthiness of the counterparty, the timing of expected future cash flows, discount rates, and the expected holding period. The security was also compared, when possible, to other observable market data for securities with similar characteristics.

In the event we need to access the funds that are not currently liquid, we will not be able to do so without the possible loss of principal, until a future auction for these investments is successful or they are redeemed by the issuer or they mature. If we are unable to sell these securities in the market or they are not redeemed, then we may be required to hold them until 2038 when they mature. We do not anticipate a need to access these funds for operational purposes for the foreseeable future. We will continue to monitor and evaluate these investments on an ongoing basis for impairment. Based on our ability to access our cash and other short-term investments, our expected operating cash flows, and our other sources of cash, we do not anticipate that the potential illiquidity of these investments will affect our ability to execute our current business plan.

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ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

INDEX TO FINANCIAL STATEMENTS

	Page
Report of Independent Registered Public Accounting Firm	39
Balance Sheets	40
Statements of Operations	41
Statements of Comprehensive Loss	42
Statements of Stockholders’ Equity	43
Statements of Cash Flows	44
Notes to Financial Statements	45

38

Report of Independent Registered Public Accounting Firm

The Board of Directors and Stockholders of Vical Incorporated

We have audited the accompanying balance sheets of Vical Incorporated as of December 31, 2015 and 2014, and the related statements of operations, comprehensive loss, stockholders' equity and cash flows for each of the three years in the period ended December 31, 2015. These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in all material respects, the financial position of Vical Incorporated at December 31, 2015 and 2014, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2015, in conformity with U.S. generally accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), Vical Incorporated’s internal control over financial reporting as of December 31, 2015, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) and our report dated March 14, 2016 expressed an unqualified opinion thereon.

/s/ Ernst & Young LLP

San Diego, California

March 14, 2016

39

VICAL INCORPORATED

BALANCE SHEETS

(in thousands, except per share data)

	December 31,
	2015			2014
ASSETS
Current assets:
Cash and cash equivalents	$	13,450		$	20,471
Marketable securities, available-for-sale		23,258			23,499
Restricted cash		3,246			3,182
Receivables and other assets		4,544			4,178
Total current assets		44,498			51,330
Long-term investments		2,052			1,971
Property and equipment, net		1,873			2,639
Intangible assets, net		1,300			1,660
Other assets		191			379
Total assets	$	49,914		$	57,979
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable and accrued expenses	$	3,912		$	5,201
Deferred revenue		250			—
Total current liabilities		4,162			5,201
Long-term liabilities:
Deferred rent		359			856
Commitments and contingencies (Notes 6 and 7)
Stockholders’ equity:
Preferred stock, $0.01 par value, 5,000 shares authorized, none issued    and outstanding		—			—
Common stock, $0.01 par value, 160,000 shares authorized, 91,544 and 90,334    shares issued and outstanding at December 31, 2015 and 2014, respectively		915			903
Additional paid-in capital		449,343			446,698
Accumulated deficit		(404,905	)		(395,667	)
Accumulated other comprehensive income (loss)		40			(12	)
Total stockholders’ equity		45,393			51,922
Total liabilities and stockholders’ equity	$	49,914		$	57,979

See accompanying notes to financial statements

40

VICAL INCORPORATED

STATEMENTS OF OPERATIONS

(in thousands, except per share data)

	Year Ended December 31,
	2015			2014			2013
Revenues:
Contract revenue	$	18,860		$	13,304		$	5,846
License and royalty revenue		2,090			1,913			1,872
Total revenues		20,950			15,217			7,718
Operating expenses:
Research and development		11,061			11,467			14,558
Manufacturing and production		10,927			10,824			12,698
General and administrative		8,366			9,552			11,814
Total operating expenses		30,354			31,843			39,070
Loss from operations		(9,404	)		(16,626	)		(31,352	)
Other income:
Investment and other income, net		166			134			114
Net loss	$	(9,238	)	$	(16,492	)	$	(31,238	)
Basic and diluted net loss per share	$	(0.10	)	$	(0.19	)	$	(0.36	)
Weighted average shares used in computing basic and diluted net loss    per share		91,751			88,786			86,840

See accompanying notes to financial statements

41

VICAL INCORPORATED

STATEMENTS OF COMPREHENSIVE LOSS

(in thousands)

	Year Ended December 31,
	2015			2014			2013
Net loss	$	(9,238	)	$	(16,492	)	$	(31,238	)
Other comprehensive loss:
Unrealized gain (loss) on available-for-sale and long-term marketable    securities:
Unrealized gain (loss) arising during holding period, net of tax		52			(23	)		(236	)
Other comprehensive gain (loss)		52			(23	)		(236	)
Total comprehensive loss	$	(9,186	)	$	(16,515	)	$	(31,474	)

See accompanying notes to financial statements

42

VICAL INCORPORATED

STATEMENTS OF STOCKHOLDERS’ EQUITY

FOR EACH OF THE THREE YEARS IN THE PERIOD ENDED DECEMBER 31, 2015

(in thousands)

	Common Stock
	Numberof Shares		Amount		Additional Paid-in Capital			Accumulated Deficit			AccumulatedOther Comprehensive Income/(loss)			Total Stockholders’ Equity
Balance at January 1, 2013		86,136	$	861	$	435,915		$	(347,937	)	$	247		$	89,086
Net loss		—		—		—			(31,238	)		—			(31,238	)
Other comprehensive loss		—		—		—			—			(236	)		(236	)
Exercise of stock options and issuance of    common stock underlying restricted stock units    net of shares withheld to settle withholding    taxes		642		7		327			—			—			334
Non-cash compensation expense related to grant    of equity based compensation		—		—		3,466			—			—			3,466
Balance at December 31, 2013		86,778	$	868	$	439,708		$	(379,175	)	$	11		$	61,412
Net loss		—		—		—			(16,492	)		—			(16,492	)
Other comprehensive loss		—		—		—			—			(23	)		(23	)
Issuance of common stock		3,292		33		3,890			—			—			3,923
Issuance of common stock underlying restricted    stock units net of shares withheld to settle    withholding taxes		264		2		(59	)		—			—			(57	)
Non-cash compensation expense related to grant    of equity based compensation		—		—		3,159			—			—			3,159
Balance at December 31, 2014		90,334	$	903	$	446,698		$	(395,667	)	$	(12	)	$	51,922
Net loss		—		—		—			(9,238	)		—			(9,238	)
Other comprehensive income		—		—		—			—			52			52
Issuance of common stock		861		9		766			—			—			775
Issuance of common stock underlying restricted    stock units net of shares withheld to settle    withholding taxes		349		3		(23	)		—			—			(20	)
Non-cash compensation expense related to grant    of equity based compensation		—		—		1,902			—			—			1,902
Balance at December 31, 2015		91,544	$	915	$	449,343		$	(404,905	)	$	40		$	45,393

See accompanying notes to financial statements

43

VICAL INCORPORATED

STATEMENTS OF CASH FLOWS

(in thousands)

	Year Ended December 31,
	2015			2014			2013
Cash flows from operating activities:
Net loss	$	(9,238	)	$	(16,492	)	$	(31,238	)
Adjustments to reconcile net loss to net cash used in operating    activities:
Depreciation and amortization		1,159			1,663			2,213
Write-off of abandoned patents and licensed technology		230			350			889
Gain on sale of property and equipment		(1	)		(15	)		(7	)
Compensation expense related to stock options and awards		1,902			3,159			3,466
Purchase of technology license with common stock		775			—			—
Changes in operating assets and liabilities:
Receivables and other assets		(178	)		412			(2,626	)
Accounts payable and accrued expenses		(1,415	)		1,635			(2,188	)
Deferred revenue		250			(150	)		—
Deferred rent		(432	)		(368	)		(307	)
Net cash used in operating activities		(6,948	)		(9,806	)		(29,798	)
Cash flows from investing activities:
Maturities of marketable securities		20,183			10,556			30,974
Purchases of marketable securities		(20,114	)		(22,643	)		(5,137	)
Purchases of property and equipment		(72	)		(85	)		(332	)
Proceeds from the sale of property and equipment		3			15			49
Patent and licensed technology expenditures		(53	)		(269	)		(412	)
Net cash (used in) provided by investing activities		(53	)		(12,426	)		25,142
Cash flows from financing activities:
Net proceeds from issuance of common stock		3			3,925			816
Payment of withholding taxes for net settlement of restricted    stock units		(23	)		(59	)		(482	)
Net cash (used in) provided by financing activities		(20	)		3,866			334
Net decrease in cash and cash equivalents		(7,021	)		(18,366	)		(4,322	)
Cash and cash equivalents at beginning of year		20,471			38,837			43,159
Cash and cash equivalents at end of year	$	13,450		$	20,471		$	38,837

See accompanying notes to financial statements

44

VICAL INCORPORATED

NOTES TO FINANCIAL STATEMENTS

1. Organization and Summary of Significant Accounting Policies

Organization and Business Activity

Vical Incorporated, or the Company, a Delaware corporation, was incorporated in April 1987 and has devoted substantially all of its resources since that time to its research and development programs. The Company researches and develops biopharmaceutical products, including those based on its patented DNA delivery technologies for the prevention and treatment of serious or life-threatening diseases.

All of the Company’s potential products are in research and development phases. No revenues have been generated from the sale of any such products, nor are any such revenues expected for at least the next several years. The Company earns revenue from research and development agreements with pharmaceutical collaborators and from contract manufacturing agreements. Most of the Company’s product candidates will require significant additional research and development efforts, including extensive preclinical and clinical testing. All product candidates that advance to clinical testing will require regulatory approval prior to commercial use, and will require significant costs for commercialization. There can be no assurance that the Company’s research and development efforts, or those of its collaborators, will be successful. The Company expects to continue to incur substantial losses and not generate positive cash flows from operations for at least the next several years. No assurance can be given that the Company can generate sufficient product revenue to become profitable or generate positive cash flows from operations.

Basis of Presentation

These financial statements are prepared in conformity with accounting principles generally accepted in the United States of America.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make informed estimates and assumptions that affect the amounts reported in the financial statements and disclosures made in the accompanying notes. Actual results could differ materially from those estimates.

Cash, Cash Equivalents and Marketable Securities

Cash and cash equivalents consist of cash and highly liquid securities with original maturities at the date of acquisition of ninety days or less and can be liquidated without prior notice or penalty. Investments with an original maturity of more than ninety days are considered marketable securities and have been classified by management as available-for-sale. These investments are classified as current assets, even though the stated maturity date may be one year or more beyond the current balance sheet date which reflects management’s intention to use the proceeds from sales of these securities to fund its operations, as necessary. Such investments are carried at fair value, with unrealized gains and losses included as a separate component of stockholders’ equity. Realized gains and losses from the sale of available-for-sale securities or the amounts, net of tax, reclassified out of accumulated other comprehensive income (loss), if any, are determined on a specific identification basis.

Restricted Cash

The Company is required to maintain a letter of credit securing an amount equal to twelve months of the current monthly installment of base rent for the term of the lease for its facilities, which ends in August 2017. Under certain circumstances the Company may be able to eliminate the need for the letter of credit. At December 31, 2015 and 2014, restricted cash of $3.2 million  was pledged as collateral for the letter of credit.

45

Concentrations of Credit Risk

Financial instruments that potentially subject the Company to significant concentrations of credit risk consist primarily of cash equivalents, marketable securities and receivables. The Company invests its excess cash in debt instruments of financial institutions and of corporations with above average credit ratings, in U.S. government obligations, and in money market funds and certificates of deposits at financial institutions.

Property and Equipment

Property and equipment is recorded at cost and depreciation is computed using the straight-line method over the estimated useful lives of the assets. Assets acquired pursuant to capital lease arrangements and leasehold improvements are amortized using the straight-line method over the shorter of the life of the remaining lease term or the remaining useful life of the asset. Manufacturing equipment has estimated useful lives of ten years. All other property and equipment have estimated useful lives of 3 to 5 years. Maintenance and repairs of property and equipment are expensed as incurred.

Intangible Assets

Intangible assets include certain costs related to patent applications. The Company capitalizes license fees paid to acquire access to proprietary technology if the technology is expected to have alternative future use in multiple research and development projects. The cost of licensed technology rights is amortized using the straight-line method over the estimated useful life of the technology. Certain costs related to patent applications are amortized over the estimated economic lives of the patents, which is generally 20 years and typically commences at the time the patent application is filed. As of December 31, 2015, the weighted average amortization period of capitalized patent costs is approximately 9 years. Amortization expense for licensed technology and capitalized patent cost is included in research and development expenses.

Impairment of Long-lived Assets

The Company reviews long-lived assets for impairment at least annually, quarterly for intangible assets, and whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Should an impairment exist, the impairment loss would be measured based on the excess of the carrying amount of the asset over the asset’s estimated fair value and the loss recognized in current earnings. The Company recognized research and development expense of approximately $0.2 million, $0.4 million and $0.9 million for the years ended December 31, 2015, 2014 and 2013, respectively, related to patents for which the value was deemed to be impaired.  2013 also includes expense relating to licensed technology for which the value was deemed to be impaired.

Revenue Recognition

Revenue is recognized when the four basic criteria of revenue recognition are met: (1) persuasive evidence of an arrangement exists; (2) delivery has occurred or services rendered; (3) the fee is fixed or determinable; and (4) collectability is reasonably assured. Certain of the Company’s revenue is generated through manufacturing contracts and stand-alone license agreements.

The Company has entered into multiple-element arrangements. In order to account for the multiple-element arrangements, the Company identifies the deliverables included within the agreement and evaluates which deliverables represent separate units of accounting. Analyzing the arrangement to identify deliverables requires the use of judgment, and each deliverable may be an obligation to deliver services, a right or license to use an asset, or another performance obligation.

Multiple-element arrangements

The Company has entered into multiple-element arrangements. In order to account for the multiple-element arrangements, the Company identifies the deliverables included within the agreement and evaluates which deliverables represent separate units of accounting. Analyzing the arrangement to identify deliverables requires the use of judgment, and each deliverable may be an obligation to deliver services, a right or license to use an asset, or another performance obligation. The delivered item(s) must have value to the customer on a standalone basis and, if the arrangement includes a general right of return relative to the delivered item, delivery or performance of the undelivered item(s) is considered probable and substantially in the Company’s control.

46

A delivered item is considered a separate unit of accounting when the delivered item has value to the partner on a standalone basis based on the consideration of the relevant facts and circumstances for each arrangement. Factors considered in this determination include the research capabilities of the partner and the availability of research expertise in this field in the general marketplace. Arrangement consideration is allocated at the inception of the agreement to all identified units of accounting based on their relative selling price. The relative selling price for each deliverable is determined using vendor specific objective evidence, or VSOE, of selling price or third-party evidence of selling price if VSOE does not exist. If neither VSOE nor third-party evidence of selling price exists, the Company uses its best estimate of the selling price for the deliverable. The amount of allocable arrangement consideration is limited to amounts that are fixed or determinable. The consideration received is allocated among the separate units of accounting, and the applicable revenue recognition criteria are applied to each of the separate units. Changes in the allocation of the sales price between delivered and undelivered elements can impact revenue recognition but do not change the total revenue recognized under any agreement. If facts and circumstances dictate that the license has standalone value from the undelivered items, which generally include research and development services and the manufacture of drug products, the license is identified as a separate unit of accounting and the amounts allocated to the license are recognized upon the delivery of the license, assuming the other revenue recognition criteria have been met. However, if the amounts allocated to the license through the relative selling price allocation exceed the upfront license fee, the amount recognized upon the delivery of the license is limited to the upfront fee received. If facts and circumstances dictate that the license does not have standalone value, the transaction price, including any upfront license fee payments received, are allocated to the identified separate units of accounting and recognized as those items are delivered.

The terms of the Company’s partnership agreements provide for milestone payments upon achievement of certain regulatory and commercial events. Under the Milestone Method, the Company recognizes consideration that is contingent upon the achievement of a milestone in its entirety as revenue in the period in which the milestone is achieved only if the milestone is substantive in its entirety. A milestone is considered substantive when it meets all of the following three criteria: 1) The consideration is commensurate with either the entity’s performance to achieve the milestone or the enhancement of the value of the delivered item(s) as a result of a specific outcome resulting from the entity’s performance to achieve the milestone, 2) The consideration relates solely to past performance, and 3) The consideration is reasonable relative to all of the deliverables and payment terms within the arrangement. A milestone is defined as an event (i) that can only be achieved based in whole or in part on either the entity’s performance or on the occurrence of a specific outcome resulting from the entity’s performance, (ii) for which there is substantive uncertainty at the date the arrangement is entered into that the event will be achieved and (iii) that would result in additional payments being due to the Company.

Contract Services, Grant and Royalty Revenue

The Company recognizes revenues from contract services and federal government research grants during the period in which the related expenditures are incurred and related payments for those services are received or collection is reasonably assured. Royalties to be received based on sales of licensed products by the Company’s partners incorporating the Company’s licensed technology are recognized when received.

Accruals for Potential Disallowed Costs on Government Contracts

The Company has contracts with U.S. government agencies under which it bills for direct and indirect costs incurred. These billed costs are subject to audit by government agencies. The Company established accruals of approximately $49,000 at each of December 31, 2015 and 2014 to provide for potential disallowed costs. In the event that the final costs allowed are different from what the Company has estimated, the Company may need to make a change in its estimated accrual, which could also affect its results of operations and cash flow.

Research and Development Costs

Research and development costs are expensed as incurred. Research and development costs include salaries and personnel-related costs, supplies and materials, outside services, costs of conducting preclinical and clinical trials, facilities costs and amortization of intangible assets. The Company accounts for its clinical trial costs by estimating the total cost to treat a patient in each clinical trial, and accruing this total cost for the patient over the estimated treatment period, which corresponds with the period over which the services are performed, beginning when the patient enrolls in the clinical trial. This estimated cost includes payments to the site conducting the trial, and patient-related lab and other costs related to the conduct of the trial. Cost per patient varies based on the type of clinical trial, the site of the clinical trial, the method of administration of the treatment, and the number of treatments that a patient receives. Treatment periods vary depending on the clinical trial. The Company makes revisions to the clinical trial cost estimates in the current period, as clinical trials progress.

47

Manufacturing and Production Costs

Manufacturing and production costs include expenses related to manufacturing contracts and expenses for the production of plasmid DNA for use in the Company’s research and development efforts. Manufacturing expenses related to manufacturing contracts are deferred and expensed when the related revenue is recognized. Production expenses related to the Company’s research and development efforts are expensed as incurred.

Net Loss Per Share

Basic and diluted net loss per share has been computed using the weighted-average number of shares of common stock outstanding during the period. The weighted-average number of shares used to compute diluted loss per share excludes any assumed exercise of stock options, and the assumed issuance of common stock under restricted stock units, or RSUs, as the effect would be antidilutive. Common stock equivalents of 0.3 million, 0.5 million and 0.9 million for the years ended December 31, 2015, 2014 and 2013, respectively, were excluded from the calculation because of their antidilutive effect.

Fair Value of Financial Instruments

The carrying amounts of cash, cash equivalents, restricted cash, marketable securities, receivables, accounts payable and accrued expenses at December 31, 2015 and 2014, are considered to approximate fair value because of the short term nature of those items.

Income Taxes

The impact of an uncertain income tax position on the income tax return must be recognized at the largest amount that is more-likely-than-not to be sustained upon audit by the relevant taxing authority. An uncertain income tax position will not be recognized if it has less than a 50% likelihood of being sustained. There were no unrecognized tax benefits recorded by the Company as of the date of adoption in 2007. There are no unrecognized tax benefits included in the balance sheets that would, if recognized, affect the effective tax rate.

Deferred income taxes result primarily from temporary differences between financial and tax reporting. Deferred tax assets and liabilities are determined based on the difference between the financial statement bases and the tax bases of assets and liabilities using enacted tax rates. A valuation allowance is established to reduce a deferred tax asset to the amount that is expected more likely than not to be realized.

Comprehensive Loss

Comprehensive loss consists of net loss and certain changes in equity that are excluded from net loss. Comprehensive loss for the years ended December 31, 2015, 2014 and 2013, has been reflected in the accompanying Statements of Comprehensive Loss. Accumulated other comprehensive income (loss), which is included in stockholders’ equity, represents unrealized gains and losses on marketable securities.

Business Segments

The Company operates in one business segment, which is within the United States, and is dedicated to research and development of DNA delivery technology.

Stock-Based Compensation

The Company records its compensation expense associated with stock options and other forms of equity compensation based on their fair value at the date of grant using the Black-Scholes-Merton option pricing model. Stock-based compensation includes amortization related to stock option awards based on the estimated grant date fair value. Stock-based compensation expense related to stock options includes an estimate for forfeitures and the portion that is ultimately expected to vest is recognized ratably over the vesting period of the option. In addition, the Company records expense related to RSUs granted based on the fair value of those awards on the grant date. The fair value related to the RSUs is amortized to expense over the vesting term of those awards. Stock-based compensation expense related to RSUs includes an estimate for forfeitures and the portion expected to vest is recognized ratably over the requisite service period. The expected forfeiture rate of all equity based compensation is based on observed historical patterns of the Company’s employees and is estimated to be 8.75%, 8.75% and 11.2% annually for each of the years ended December 31, 2015, 2014 and 2013, respectively .

48

The fair value of each option award is estimated on the date of grant using the Black-Scholes-Merton valuation model using the assumptions noted in the following table. The expected life of options is based on the Company’s observed historical exercise patterns. The expected volatility of stock options is based upon the historical volatility of the Company’s stock commensurate with the expected life of the option. The risk-free interest rate is based on the implied yield on a U.S. Treasury zero-coupon issue with a remaining term equal to the expected term of the option. The dividend yield reflects that the Company has not paid any cash dividends since inception and does not intend to pay any cash dividends in the foreseeable future.

	Year Ended December 31,
	2015		2014		2013
Assumptions:
Assumed risk-free interest rate		1.34%		1.63%		1.14%
Assumed volatility		68%		73%		72%
Average expected option life	4.5 years		4.5 years		4.5 years
Expected dividend yield		—		—		—

Recent Accounting Pronouncements

In July 2013, the FASB issued guidance on the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. The guidance was effective prospectively for fiscal years, and interim periods within those years, beginning after December 15, 2013. The adoption of this standard beginning with the first quarter of 2014 did not have a material impact on the Company’s consolidated financial statements.

In May 2014, the FASB issued guidance that outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. The guidance provides that an entity recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This guidance also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments, and assets recognized from costs incurred to obtain or fulfill a contract. The guidance allows for either full retrospective or modified retrospective adoption and will become effective for the Company in the first quarter of 2017. The Company is evaluating the alternative transition methods and the potential effects of the adoption of this update on its financial statements.

In August 2014, the FASB issued an amendment to the accounting guidance related to the evaluation of an entity to continue as a going concern. The amendment establishes management’s responsibility to evaluate whether there is substantial doubt about an entity’s ability to continue as a going concern in connection with preparing financial statements for each annual and interim reporting period. The amendment also gives guidance to determine whether to disclose information about relevant conditions and events when there is substantial doubt about an entity’s ability to continue as a going concern. The amended guidance is effective prospectively for fiscal years beginning after December 15, 2016. The new guidance will not have an impact on the Company’s financial position, results of operations or cash flows.

2. Short-Term Marketable Securities

The following is a summary of short-term marketable securities classified as available-for-sale (in thousands):

December 31, 2015	Amortized Cost		Unrealized Gain		Unrealized Loss		Market Value
U.S. treasuries	$	7,027	$	—	$	8	$	7,019
Corporate bonds		1,000		—		—		1,000
Certificates of deposit		15,239		—		—		15,239
	$	23,266	$	—	$	8	$	23,258

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December 31, 2014	Amortized Cost		Unrealized Gain		Unrealized Loss		Market Value
U.S. treasuries	$	5,558	$	—	$	1	$	5,557
Government-sponsored enterprise securities		7,499		—		6		7,493
Corporate bonds		2,025		—		5		2,020
Certificates of deposit		8,429		—		—		8,429
	$	23,511	$	—	$	12	$	23,499

At December 31, 2015, none of these securities were scheduled to mature outside of one year. There were no net realized gains (losses) on sales of available-for-sale securities for the years ended December 31, 2015, 2014 and 2013. None of these investments have been in a continuous unrealized loss position for more than 12 months as of December 31, 2015 and 2014.

3. Long-Term Investments

As of December 31, 2015, the Company held an auction rate security with a par value of $2.5 million. This auction rate security has not experienced a successful auction since the liquidity issues experienced in the global credit and capital markets in 2008. As a result the security is classified as a long-term investment as it is scheduled to mature in 2038. The security was rated A- by Standard and Poor’s as of December 31, 2015. The security continues to pay interest according to its stated terms.

The valuation of the Company’s auction rate security is subject to uncertainties that are difficult to predict. The fair value of the security is estimated utilizing a discounted cash flow analysis. The key drivers of the valuation model include the expected term, collateral underlying the security investment, the creditworthiness of the counterparty, the timing of expected future cash flows, discount rates, liquidity and the expected holding period. The security was also compared, when possible, to other observable market data for securities with similar characteristics. As of December 31, 2015, the inputs used in the Company’s discounted cash flow analysis assumed an interest rate of 1.72%, an estimated redemption period of five years and a discount rate of 1.0%.  Based on the valuation of the security, the Company has recognized cumulative losses of $0.5 million as of December 31, 2015, none of which were realized during the year ended December 31, 2015. The losses, when recognized, are included in investment and other income. The market value of the security has partially recovered. Included in other comprehensive (loss) income are unrealized gains (losses) of $48,000, $(9,000) and $(0.2) million for the years ended December 31, 2015, 2014 and 2013, respectively. As of December 31, 2015, the Company had recorded cumulative unrealized gains of $0.2 million. The resulting carrying value of the auction rate security at December 31, 2015, was $2.1 million. Any future decline in market value may result in additional losses being recognized.

4. Fair Value Measurements

The Company measures fair value as an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. Fair value measurements are based on a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows:

· Level 1: Observable inputs such as quoted prices in active markets;

· Level 2: Inputs, other than the quoted prices in active markets, that are observable either directly or indirectly; and

· Level 3: Unobservable inputs for which there is little or no market data, which require the reporting entity to develop its own assumptions.

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Cash equivalents, marketable securities and long-term investments measured at fair value are classified in the table below in one of the three categories described above (in thousands):

	Fair Value Measurements
December 31, 2015	Level 1		Level 2		Level 3		Total
Certificates of deposit	$	15,239	$	—	$	—	$	15,239
U.S. treasuries		7,019		—		—		7,019
Corporate bonds		—		1,000		—		1,000
Auction rate securities		—		—		2,052		2,052
	$	22,258	$	1,000	$	2,052	$	25,310

	Fair Value Measurements
December 31, 2014	Level 1		Level 2		Level 3		Total
Certificates of deposit	$	8,674	$	—	$	—	$	8,674
Money market funds		169		—		—		169
U.S. treasuries		5,557		—		—		5,557
Corporate bonds		—		2,020		—		2,020
Government-sponsored enterprise securities		—		7,493		—		7,493
Auction rate securities		—		—		1,971		1,971
	$	14,400	$	9,513	$	1,971	$	25,884

The Company’s investments in U.S. treasury securities, certificates of deposit and money market funds are valued based on publicly available quoted market prices for identical securities as of December 31, 2015. The Company determines the fair value of other government-sponsored enterprise related securities with the aid of valuations provided by third parties using proprietary valuation models and analytical tools. These valuation models and analytical tools use market pricing or similar instruments that are both objective and publicly available, including matrix pricing or reported trades, benchmark yields, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids and/or offers. The Company validates the valuations received from its primary pricing vendors for its level 2 securities by examining the inputs used in that vendor’s pricing process and determines whether they are reasonable and observable. The Company also compares those valuations to recent reported trades for those securities. The Company did not adjust any of the valuations received from these third parties with respect to any of its level 2 securities at December 31, 2015. The valuation of the Company’s investment in auction rate securities is more fully described in Note 3.

Activity for assets measured at fair value using significant unobservable inputs (Level 3) is presented in the table below (in thousands):

Balance at December 31, 2014	$	1,971
Total net realized gains included in earnings		—
Total net unrealized gains included in other    comprehensive income		81
Net transfers in and/out of Level 3		—
Balance at December 31, 2015	$	2,052
Amount of total losses for the period included in net loss    attributable to the change in unrealized gains or losses    relating to assets still held at December 31, 2015	$	—

Total cumulative unrealized losses of $0.4 million relate to Level 3 assets still held as of December 31, 2015, none of which were recognized during the years ended December 31, 2015, 2014 and 2013. The losses, when recognized, are included in investment and other income.

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5. Other Balance Sheet Accounts

Property and equipment consisted of the following at December 31 (in thousands):

	2015			2014
Equipment	$	17,425		$	17,515
Leasehold improvements		8,048			8,048
		25,473			25,563
Less accumulated depreciation and amortization		(23,600	)		(22,924	)
	$	1,873		$	2,639

Depreciation and amortization of equipment and leasehold improvements for the years ended December 31, 2015, 2014 and 2013, was $0.9 million, $1.4 million and $1.6 million, respectively.

Intangible assets consisted of the following at December 31 (in thousands):

	2015			2014
Patent application costs		2,252			2,972
Accumulated amortization patent costs		(952	)		(1,312	)
	$	1,300		$	1,660

Amortization of licensed technology rights and patent application costs for the years ended December 31, 2015, 2014 and 2013, was $0.2 million, $0.2 million and $0.4 million, respectively. Estimated annual amortization for these assets is $0.2 million for the years ended 2016 and 2017, $0.1 million for each of the years in the period from 2018 to 2020, and $0.6 million being recognized thereafter.

Accounts payable and accrued expenses consisted of the following at December 31 (in thousands):

	2015		2014
Employee compensation	$	2,220	$	2,471
Clinical trial accruals		102		1,686
Accounts payable		733		227
Deferred rent		496		432
Other accrued liabilities		361		385
	$	3,912	$	5,201

6. Significant Contract, License and Royalty Agreements

Contracts

IPPOX

In April 2015, the Company entered into a $4.1 million contract with the IPPOX Foundation to manufacture HIV-antigen plasmid DNA as a component of vaccine regimens to be evaluated in clinical trials for the prevention of HIV infection. IPPOX is a Swiss non-profit foundation that participates in the conduct of HIV vaccine clinical trials under the auspices of the Pox-Protein Public-Private Partnership, or P5, funded by theBill & Melinda Gates Foundation and the U.S. National Institute of Allergy and Infectious Diseases, or NIAID.  These plasmids were shipped and the related revenue of $4.1 million was recognized in December 2015. This contract builds upon the Company’s 2010 agreement with IPPOX to manufacture plasmid DNA for HIV vaccine clinical trials.

Astellas

In July 2011, the Company entered into license agreements with Astellas Pharma Inc., or Astellas, granting Astellas exclusive, worldwide, royalty-bearing licenses under certain of the Company’s know-how and intellectual property to develop and commercialize certain products containing plasmids encoding certain forms of glycoprotein B and/or phosphoprotein 65, including ASP0113 but excluding CyMVectin™. Under the agreements, Astellas is responsible for the worldwide development and commercialization of products in the licensed field, at its expense, and has agreed to use commercially reasonable efforts to develop, obtain regulatory approval for and commercialize at least one licensed product

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for use in certain immunocompromised patients in the licensed field in the United States and certain other major markets. Under the terms of the license agreements, Astellas paid a nonrefundable upfront license fee of $25.0 million.

In 2012, the Company received a $10.0 million milestone payment upon finalization of the trial design for a Phase 3 registration trial of ASP0113 in hematopoietic stem cell transplant recipients. The Company is also entitled to receive additional cash payments potentially totaling $95.0 million for achievement of certain milestones through commercial launch and to receive double-digit royalties on net sales of products. In addition, the Company has an option to co-promote ASP0113 in the United States. Under the terms of a supply and services agreement entered into by the Company and Astellas on the same date, the Company agreed to perform certain development and regulatory activities, at Astellas’ expense, and to supply licensed products to Astellas, at Astellas’ expense, for use in development and initial commercialization activities in the licensed field.

In August 2012, the Company amended its license and supply agreements with Astellas to, among other things, extend the time period that the Company is obligated to supply licensed products for commercial use to Astellas, at Astellas’ expense, modify the allocation of $95.0 million of milestone payments among certain milestones through commercial launch and modify the structure of the royalties on net sales from a fixed double digit royalty to tiered double digit royalties.

The Company identified the deliverables at the inception of the agreements. The Company has determined that the license and related know-how, the development and regulatory services and the drug product supply individually represent separate units of accounting, because each deliverable has standalone value. The best estimated selling prices for these units of accounting was determined based on market conditions, the terms of comparable collaborative arrangements for similar technology in the pharmaceutical and biotechnology industry and entity-specific factors, such as the terms of the Company’s previous collaborative agreements, the Company’s pricing practices and pricing objectives and the nature of the research and development services to be performed for the partner. The arrangement consideration was allocated to the deliverables based on the relative selling price method.

The amount of allocable arrangement consideration is limited to amounts that are fixed or determinable; therefore, the amount allocated to the licenses was limited to the extent of cash received. As a result, during the years ended December 31, 2015, 2014 and 2013, the Company recognized $1.8 million, $1.6 million and $0.7 million, respectively, related to the license fee and know-how. The Company will recognize the amounts allocated to research and development services as revenues under the agreements as the related services are delivered and as reimbursements are received. During the years ended December 31, 2015, 2014 and 2013, the Company recognized $8.7 million, $7.8 million and $4.4 million, respectively, of revenue related to contract services delivered. The Company will recognize as revenue the amounts allocated to the sales of drug product when the sale of that drug product has met all required specifications and the related title and risk of loss and damages have passed to Astellas. During the years ended December 31, 2015, 2014 and 2013, the Company recognized $6.0 million, $5.5 million and $1.2 million, respectively, of revenue related to drug product delivered. The Company is eligible to receive additional cash payments upon the achievement of specified regulatory and commercial milestones. The Company has determined that each of the regulatory and commercial milestones meets the definition of a milestone and that each milestone is substantive in accordance with the milestone method of revenue recognition. Accordingly, the Company expects to recognize such regulatory and commercial milestone payments as revenues under the agreements upon achievement of each milestone.

In-licensing Agreements

Astellas

In March 2015, the Company entered into a license agreement with Astellas which grants to the Company exclusive worldwide license to develop and commercialize a novel antifungal, VL-2397.  As consideration for the rights under the license, the Company issued 861,216 shares of our common stock to Astellas and made an up-front payment of $250,000 in cash. The License Agreement provides for potential development, regulatory and sales milestone payments totaling up to $99.0 million, the vast majority of which are payable upon achievement of commercial and sales milestones, and single-digit royalties on net sales of commercial products. The Company is responsible for the worldwide development, manufacturing and commercialization of licensed products, at the Company’s cost, and we are required to use commercially reasonable efforts with respect to such development and commercialization activities.

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The license agreement, unless terminated earlier, will continue until expiration of Vical’s royalty obligations with respect to licensed products. Either party may terminate the license agreement earlier if the other party materially breaches the agreement and does not cure the breach within a specified notice period, or upon the other party’s insolvency.  Astellas may terminate the license agreement earlier if Vical or any of its affiliates or sublicensees oppose or challenge any of the licensed patents. Vical may terminate the license agreement on a country-by-country basis for reasonable scientific, regulatory, commercial, financial, ethical or other reasons.

City of Hope

In 2003, the Company licensed from the City of Hope on an exclusive basis various U.S. patents that provide protection for CMV-related polynucleotide based vaccines, including TransVax^TM and CyMVectin^TM vaccine candidates. The agreement expires upon the last to expire of the patent rights licensed by the Company under the agreement, unless earlier terminated as set forth in the agreement. The City of Hope may terminate the agreement early, in accordance with notice provisions set forth in the agreement, if the Company ceases to operate, fails to make payments when due or materially breaches the agreement. Subject to certain conditions, the Company may terminate the agreement early at any time upon prior written notice to the City of Hope. The Company is also obligated to pay a low double-digit percentage of any payments it receives from the sub-license of products that incorporate the licensed technology. The Company paid the City of Hope $0.1 million under the agreement for each of the years ended December 31, 2015, 2014 and 2013.

CytRx

In 2001, the Company entered into an exclusive agreement with CytRx which grants to the Company the rights to use or sublicense CytRx’s poloxamer technology to enhance viral or non-viral delivery of polynucleotides in all preventive and therapeutic human and animal health applications, including CMV. The agreement excludes applications for four infectious disease vaccine targets that had been licensed to Merck and prostate-specific membrane antigen. In addition, the agreement permits the Company’s use of CytRx’s technology to enhance the delivery of proteins in prime-boost vaccine applications that involve the use of polynucleotides. As part of the agreement, the Company made a $3.8 million up-front payment and agreed to make potential future milestone and royalty payments. The license fee is fully amortized as of December 31, 2013. The Company paid CytRx $0.1 million, $0.1 million and $0.3 million under the agreement for the years ended December 31, 2015, 2014 and 2013, respectively.

Milestone Payments

The Company may be required to make future payments to its licensors based on the achievement of milestones set forth in various in-licensing agreements. In most cases, these milestone payments are based on the achievement of development or regulatory milestones, including the exercise of options to obtain licenses related to specific disease targets, commencement of various phases of clinical trials, filing of product license applications, approval of product licenses from the FDA or a foreign regulatory agency, and the first commercial sale of a related product. Payment for the achievement of milestones under the Company’s in-license agreements is highly speculative and subject to a number of contingencies.

The aggregate amount of additional milestone payments that the Company could be required to pay under its active in-license agreements in place at December 31, 2015, is approximately $106.1 million. These amounts assume that all remaining milestones associated with the milestone payments are met. In the event that product license approval for any of the related products is obtained, the Company may be required to make royalty payments in addition to these milestone payments. Although the Company believes that some of the milestones contained in its in-license agreements may be achieved, it is highly unlikely that a significant number of them will be achieved. Because the milestones are contingent the Company is not in a position to reasonably estimate how much, if any, of the potential milestone payments will ultimately be paid. Additionally, under the in-license agreements, many of the milestone events are related to progress in clinical trials which the Company estimates will take several years to achieve.

7. Commitments and Contingencies

Facility Leases

The Company is currently leasing its facility which has approximately 68,400 square feet of manufacturing, research laboratory and office space. The lease expires in August 2017. The Company has the option to renew the lease for three additional five-year periods beyond its expiration.

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The lease related to the facility is treated as an operating lease. The minimum annual rent on the facility is subject to increases specified in the lease. The Company is also required to pay taxes, insurance and operating costs under the facility lease. The Company recognizes level monthly rent for its facility lease over the entire lease period. The monthly rent is calculated by adding the total rent payments over the entire lease period and then dividing the result by the total term of the lease. The $0.9 million difference between the base rent paid and the rent expensed through December 31, 2015 is recorded as deferred rent in the balance sheet. Rent expense for each of the years ended December 31, 2015, 2014 and 2013 was $2.8 million.

At December 31, 2015, future minimum rental payments due under the Company’s facilities lease were as follows (in thousands):

Year ending December 31,
2016	$	3,602
2017		2,433
2018		—
2019		—
2020		—
Thereafter		—
Total lease payments	$	6,035

Other Contingencies

In late October and early November 2013, following the Company’s announcement of the results of its Phase 3 trial of Allovectin^® and the subsequent decline of the price of the Company’s common stock, two putative securities class action complaints were filed in the U.S. District Court for the Southern District of California against the Company and certain of its current and former officers. On February 26, 2014, the two cases were consolidated into one action and a lead plaintiff and lead counsel were appointed (“Consolidation Order”).  On May 12, 2014, the lead plaintiff filed a first amended consolidated complaint alleging that the defendants violated Section 10(b) and 20(a) of the Securities Exchange Act of 1934 by making materially false and misleading statements regarding our business prospects and the prospects for Allovectin^®, thereby artificially inflating the price of the Company’s common stock.  On June 9, 2014, the defendants filed a motion to dismiss the first amended complaint and a motion to strike certain allegations in the amended complaint.  On March 9, 2015, the Court granted defendants’ motion to dismiss the first amended complaint and terminated as moot defendants’ motion to strike, or Order. The lead plaintiff was granted leave to amend his first amended complaint on or before March 25, 2015. The lead plaintiff chose not to amend his complaint and instead stipulated to an entry of judgment. On April 28, 2015, the Court entered final judgment dismissing the action, or Judgment. On May 28, 2015, the lead plaintiff appealed the Judgment to the U.S. Court of Appeals for the Ninth Circuit. That same day, another group of the Company’s stockholders that had previously moved for appointment as lead plaintiff, or the Vical Investor Group, also appealed the Judgment, as well as the Consolidation Order, to the U.S. Court of Appeals for the Ninth Circuit. On August 3, 2015, the Vical Investor Group voluntarily dismissed its appeal. On October 8, 2015, the lead plaintiff-appellant filed an opening brief in support of his appeal. Defendants filed an answering brief on December 9, 2015. On January 27, 2016, lead plaintiff-appellant filed a motion to dismiss his appeal with prejudice, which was joined by defendants. On February 1, 2016, the Ninth Circuit granted the joint motion and dismissed the appeal.     

In the ordinary course of business, the Company may become a party to additional lawsuits involving various matters. The Company is unaware of any such lawsuits presently pending against it which, individually or in the aggregate, are deemed to be material to the Company’s financial condition or results of operations.

The Company prosecutes its intellectual property vigorously to obtain the broadest valid scope for its patents. Due to uncertainty of the ultimate outcome of these matters, the impact on future operating results or the Company’s financial condition is not subject to reasonable estimates.

8. Stockholders’ Equity

As of the date of this filing the Company has on file a shelf registration statement that allows it to raise up to an additional $100.0 million from the sale of common stock, preferred stock, debt securities and/or warrants. Specific terms of any offering under the shelf registration statements and the securities involved would be established at the time of sale.

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In March 2015, the Company entered into license and stock purchase agreements with Astellas, granting the Company an exclusive worldwide license to develop and commercialize a novel antifungal, VL-2397, formally known as ASP2397.  VL-2397 is a potential therapeutic for invasive fungal infections, including invasive aspergillosis.  Astellas received 861,216 shares of unregistered Company common stock and $250,000 in cash.  The $250,000 cash payment and the fair value of the common stock issued of $775,094 were included in research and development expenses during the year ended December 31, 2015.

In April 2014, the Company entered into an At-the-Market Issuance Sales Agreement, or ATM Agreement, with Meyers Associates, L.P. (doing business as Brinson Patrick, a division of Meyers Associates, L.P.), or Brinson Patrick, under which the Company could issue and sell up to $25.0 million of shares of its common stock from time to time. During the year ended December 31, 2014, the Company sold 3,291,521 shares under the Sales Agreement and received gross proceeds of $4,067,751. There were no shares sold during the year ended December 31, 2015. This agreement expired in May 2015.

9. Stock Based Compensation

The Company has a stock-based compensation plan which is described below. Total stock-based compensation expense of $1.9 million, $3.2 million and $3.5 million was recognized for the years ended December 31, 2015, 2014 and 2013, respectively. Total stock-based compensation expense was allocated to research and development, manufacturing and production and general and administrative expense as follows (in thousands):

	Year Ended December 31,
	2015		2014		2013
Research and development	$	392	$	785	$	908
Manufacturing and production		159		229		258
General and administrative		1,351		2,145		2,300
Total stock-based compensation expense	$	1,902	$	3,159	$	3,466
Cash received from RSU grants and options exercised	$	3	$	2	$	816

Stock Incentive Plan

The Company has a stock incentive plan, under which 19,700,000 shares of common stock, subject to adjustment as provided in the plan, are reserved for issuance to employees, non-employee directors and consultants of the Company. As of December 31, 2015 there were 16,448,052 shares reserved for future issuance under the plan. The plan provides for the grant of incentive and nonstatutory stock options and the direct award or sale of shares, including restricted stock. The exercise price of stock options must equal at least the fair market value of the underlying common stock on the date of grant. The maximum term of options granted under the plan is ten years. Except for annual grants to non-employee directors which vest at the next annual meeting, options generally vest 25% on the first anniversary of the date of grant, with the balance vesting quarterly over the remaining three years. The plan also limits the number of options that may be granted to any plan participant in a single calendar year to 1,300,000 shares.

The Company has granted RSUs to executive officers, other executives, and employees under the stock incentive plan. In 2015, 2014, and 2013 the Company granted RSUs covering an aggregate of 788,429, 828,000, and 409,189 shares of common stock, respectively. These RSUs generally vest 25% on the first anniversary date of the grant, with the remaining rights vesting quarterly over the remaining three years and, once vested, allow the participants to acquire the underlying shares of common stock at par value. The participants are not entitled to sell or transfer any unvested RSUs and are not entitled to vote or receive dividends on any shares of common stock covered by the RSUs prior to the acquisition of such shares. Granted but unvested RSUs are forfeited at termination of employment. Compensation expense related to the RSUs for the years ended December 31, 2015, 2014, and 2013 was approximately $0.8 million, $1.1 million and $1.0 million, respectively.

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The following table summarizes stock option transactions under the Company’s stock incentive plans for the years ended December 31, 2015, 2014 and 2013:

	Shares			WeightedAverage Exercise Price
Outstanding December 31, 2012		7,996,569		$	3.36
Granted		2,876,382		$	2.56
Exercised		(347,450	)	$	2.34
Forfeited		(2,121,313	)	$	3.27
Outstanding December 31, 2013		8,404,188		$	3.15
Granted		1,889,614		$	1.40
Exercised		—		$	—
Forfeited		(1,699,370	)	$	3.69
Outstanding December 31, 2014		8,594,432		$	2.66
Granted		2,356,750		$	1.01
Exercised		—		$	—
Forfeited		(1,495,344	)	$	2.15
Outstanding December 31, 2015		9,455,838		$	2.33
Vested and unvested options expected to vest as of    December 31, 2015		9,235,450		$	2.35

The number of underlying shares and weighted average exercise price of options exercisable at December 31, 2015, 2014 and 2013, were 6,884,679 shares at $2.68, 6,037,169 shares at $2.89, and 5,212,897 shares at $3.49, respectively. The weighted average remaining contractual term of options outstanding and options exercisable at December 31, 2015, was 6.3 years and 5.5 years, respectively. The weighted average remaining contractual term of vested and unvested options expected to vest at December 31, 2015, was 6.3 years. The aggregate intrinsic value of options outstanding and options exercisable at December 31, 2015, was $0.0 million and $0.0 million, respectively. As of December 31, 2015, the total unrecognized compensation cost related to unvested options was $0.8 million, which is expected to be recognized over a weighted-average period of 1.34 years.

The weighted average grant-date fair value of options granted during the years ended December 31, 2015, 2014 and 2013, was $0.51, $0.73 and $1.31 per share, respectively. There were no options exercised during the years ended December 31, 2015 or 2014.  The total intrinsic value of options exercised during the year ended December 31, 2013 was $0.5 million. At December 31, 2015, there were 5,421,917 shares available for grant under the Company’s stock incentive plans.

A summary of the outstanding RSUs as of December 31, 2015, and changes during the year then ended is presented below:

	Shares			WeightedAverage Grant-Date Fair Value per Share
Unvested at December 31, 2014		960,066		$	1.70
Granted		788,429		$	1.04
Vested		(579,677	)	$	1.68
Cancelled		(128,076	)	$	1.37
Unvested at December 31, 2015		1,040,742		$	1.26

The aggregate grant-date fair value of RSUs granted during the years ended December 31, 2015, 2014 and 2013, was $0.8 million, $1.2 million and $1.0 million, respectively. As of December 31, 2015, the total unrecognized compensation cost related to unvested RSUs was $0.5 million, which is expected to be recognized over a weighted average period of 1.35 years. The aggregate grant-date fair value of shares subject to RSUs vested during the years ended December 31, 2015, 2014 and 2013, was $1.0 million, $0.8 million and $1.0 million, respectively. As of December 31, 2015, there were 529,555 shares of common stock underlying RSUs that were fully vested but the issuance of such shares has been deferred.

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10. Restructuring Costs

In August 2013, the Company announced that its recently completed Phase 3 clinical trial of Allovectin^®, the Company’s investigational cancer immunotherapy, failed to meet the pre-established endpoints. As a result, the Company restructured its operations to conserve capital, which included a staff reduction of 47 employees and the impairment of certain intangible assets. The Company recorded charges for employee termination benefits during the year ended December 31, 2013 of $2.2 million, of which $1.2 million, $0.5 million and $0.5 million is included in research and development, manufacturing and production and general and administrative expenses, respectively. The Company also recorded an asset impairment charge during the year ended December 31, 2013 of $0.7 million, which is included in research and development expenses.

11. Income Taxes

At December 31, 2015, the Company had deferred tax assets of $120.8 million. Due to uncertainties surrounding the Company’s ability to generate future taxable income to realize these assets, a full valuation allowance has been established to offset the net deferred tax asset. Pursuant to Sections 382 and 383 of the Internal Revenue Code, or IRC, annual use of the Company’s net operating loss and credit carryforwards may be limited in the event a cumulative change in ownership of more than 50% occurs within a three-year period. The Company determined that such an ownership change occurred on December 29, 2006, as defined in the provisions of Section 382 of the IRC as a result of various stock issuances used to finance the Company’s operations. Such ownership change resulted in annual limitations on the utilization of tax attributes, including net operating loss carryforwards and tax credits. The Company estimates that $101.2 million of its net operating loss carryforwards were effectively eliminated under Section 382 for federal tax purposes. A portion of the remaining net operating losses limited by Section 382 become available each year. The Company also estimates that $12.2 million of its research and development credits and other tax credits were effectively eliminated under Section 383 for federal purposes. As a result of the Section 382 analysis completed during 2012, the Company has included in the deferred tax asset schedule the deferred tax assets for net operating losses of $83.1 million and tax credits of $19.9 million. The company’s Section 382 analysis was completed through December 31, 2011. There is a risk that additional changes in ownership could have occurred since that date. If a change in ownership were to have occurred, additional net operating loss and tax credit carryforwards could be eliminated or restricted. If eliminated, the related asset would be removed from the deferred tax asset schedule with a corresponding reduction in the valuation allowance.

The Company has historically filed its California income tax returns as doing business only in the state of California.  Accordingly, all of its tax operating losses have been allocated to California.  On December 31, 2015, the California Supreme Court overturned the decision of the California Court of Appeals in Gillette v. FTB.  The California Supreme Court ruling, coupled with administrative guidance from the California Franchise Tax Board, has the effect of requiring California businesses to apportion their losses to California using a single sales factor, based on a market approach.  Accordingly, the Company has preliminarily redetermined its California tax operating losses for 2013 through 2015 as if it were a multistate business subject to the California single sales factor market rules.  Such an analysis has not been completed, and therefore the Company has adjusted its California net operating loss carryforwards and deferred tax assets to the state rate of zero in its financial statement disclosures.  The California tax effect of the Company’s 2013 and 2014 net operating losses is reflected as an increase in unrecognized tax benefits in the table below.

Deferred income taxes result primarily from temporary differences between financial and tax reporting.  Deferred tax assets and liabilities are determined based on the difference between the financial statement bases and the tax bases of assets and liabilities using enacted tax rates.  A valuation allowance is established to reduce deferred tax assets to the amount that is expected more likely than not to be realized.

Significant components of the Company’s deferred tax assets as of December 31, 2015 and 2014 are listed below. A valuation allowance of $120.8 million and $124.9 million at December 31, 2015 and 2014, respectively, has been recognized to offset the net deferred tax assets as realization of such assets is uncertain.

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Amounts for the years ended December 31 were as follows (in thousands):

Deferred Tax Assets	2015			2014
Net operating losses	$	83,143		$	85,510
Credit carryovers		19,903			19,903
Depreciation and amortization		13,944			14,922
Accruals and reserves		609			808
Capital loss carryover		85			100
Other		3,114			3,660
Total deferred tax assets		120,798			124,903
Less valuation allowance		(120,798	)		(124,903	)
Net deferred tax assets	$	—		$	—

In November 2015, the FASB issued Accounting Standard Update No. 2015-17, “Balance Sheet Classification of Deferred Taxes”, an update to ASC 740, Income Taxes (“Update”).  Current GAAP requires an entity to separate deferred income tax liabilities and assets into current and noncurrent amounts in a classified statement of financial position.  To simplify the presentation of deferred income taxes, the amendments in this Update require that deferred tax liabilities and assets be classified as noncurrent in a classified statement of financial position.  The current requirement that deferred tax liabilities and assets of a tax-paying component of an entity be offset and presented as a single amount is not affected by the amendments in this Update.

For public business entities, the amendments in this update are effective for financial statements issued for annual periods beginning after December 15, 2016, and interim periods within those annual periods.  The Board also decided to permit earlier application by all entities as of the beginning of any interim or annual reporting period.  The Board further provides that this Update may be applied to all deferred tax liabilities and assets retrospectively to all periods presented.  The Company chose to adopt the Update in fiscal year ended December 31, 2015 and apply this Update on a prospective basis.

The reconciliation between the provision for income taxes and income taxes computed using the U.S. federal statutory corporate tax rate were as follows for the years ended December 31 (in thousands):

	2015			2014			2013
Computed “expected” tax benefit	$	(3,152	)	$	(5,607	)	$	(10,621	)
State income taxes, net of federal benefit		—			(444	)		(1,947	)
Tax effect of:
Change in valuation allowance		(4,069	)		5,102			13,074
Rate change		3,524			—			—
Expiration of prior year credits and net operating    losses		786			675			(237	)
Research and development and other tax credits    carryovers		—			—			(672	)
Stock compensation		376			274			337
Uncertain tax positions		3,074			—			—
Other		(539	)		—			66
Provision for income taxes	$	—		$	—		$	—

As of December 31, 2015 and 2014, the Company had available federal net operating loss carryforwards of approximately $311.3 million and $307.3 million, respectively, which expire from 2018 through 2035. In addition, the Company had federal research and development credit and orphan drug credit carryforwards of $26.3 million and $26.3 million as of December 31, 2015 and 2014, respectively, to reduce future federal income taxes, if any. These carryforwards expire from 2018 through 2033 and are subject to review and possible adjustment by the Internal Revenue Service. The Company also has available California state net operating loss carryforwards of approximately $262.8 million and $275.0 million as of December 31, 2015 and 2014, respectively, which expire from 2016 to 2035. In addition, the Company had California research and development credits of approximately $8.8 million as of December 31, 2015 and 2014 to reduce future California income tax, if any. The California research and development credits do not expire.

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The Company generated windfall tax benefits from the settlement of certain stock awards. The tax benefit will be recorded as a credit to additional paid-in capital in the year the deduction reduces income taxes payable. The net operating loss carryforwards related to these windfall tax benefits of approximately $1.6 million are included in the net operating loss carryforwards disclosed above.

The Company recognizes liabilities for uncertain tax positions based on a two-step process.  The first step is to evaluate the tax position for recognition by determining if the weight of available evidence indicates that it is more likely than not that the position will be sustained on audit, including resolution of related appeals or litigation processes, if any.  The second step is to measure the tax benefit as the largest amount that is more than 50% likely of being realized upon settlement.  While the Company believes that it has appropriate support for the positions taken on its tax returns, the Company regularly assesses the potential outcome of examinations by tax authorities in determining the adequacy of its provision for income taxes.

The Company has not completed an analysis of uncertain tax positions related to credits recorded as deferred tax assets.  If such analysis is performed at a later date and an uncertain tax position is identified, the related deferred tax asset would be reduced along with a corresponding reduction in the valuation allowance.

The following table summarizes the activity related to our unrecognized tax benefits (in thousands):

	2015		2014		2013
Beginning balance	$	582	$	—	$	—
Increases related to prior year tax positions		3,758		—		—
Increases related to current year tax positions		—		582		—
Ending balance	$	4,340	$	582	$	—

As of December 31, 2015 and 2014, the Company had gross unrecognized tax benefits of $4.3 million and $0.6 million, respectively, none of which would affect the effective tax rate.  The Company does not anticipate any significant decreases in its unrecognized tax benefits over the next 12 months.  The Company’s policy is to recognize the interest expense and/or penalties related to income tax matters as a component of income tax expense.  The Company had no accrual for interest or penalties on its balance sheets at December 31, 2015 or December 31, 2014, and has not recognized interest and/or penalties in its statements of operations for any of the years ended December 31, 2015, 2014 or 2013.

The Company is subject to taxation in the United States and California. The Company’s tax years for 1997 and forward are subject to examination by the United States and California tax authorities due to the carryforward of unutilized net operating losses and R&D credits.

12. Employee Benefit Plan

The Company has a defined contribution savings plan under section 401(k) of the IRC. The plan covers substantially all employees. The Company matches employee contributions made to the plan according to a specified formula. The Company’s matching contributions totaled approximately $0.1 million, $0.1 million and $0.2 million for the years ended 2015, 2014 and 2013, respectively.

13. Summary of (Unaudited) Quarterly Financial Information

The following is a summary of the Company’s (unaudited) quarterly results of operations for the years ended December 31 (in thousands, except per share amounts):

2015:	March 31,			June 30,			Sept. 30,			Dec. 31,
Total revenues	$	4,944		$	4,176		$	5,017		$	6,813
Total operating expenses		8,801			6,968			5,350			9,235
Net loss		(3,821	)		(2,762	)		(300	)		(2,355	)
Basic and diluted net loss per share (1)		(0.04	)		(0.03	)		(0.00	)		(0.03	)

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2014:	March 31,			June 30,			Sept. 30,			Dec. 31,
Total revenues	$	2,447		$	4,505		$	3,442		$	4,823
Total operating expenses		5,930			8,570			7,838			9,505
Net income (loss)		(3,455	)		(4,040	)		(4,364	)		(4,633	)
Basic and diluted net loss per share (1)		(0.04	)		(0.05	)		(0.05	)		(0.05	)

(1) Net income (loss) per share is computed independently for each quarter and the full year based upon respective shares outstanding. Therefore, the sum of the quarterly loss per share amounts may not equal the annual amounts reported.

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ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIALDISCLOSURE

Not applicable.

ITEM 9A. CONTROLS AND PROCEDURES

Conclusion Regarding the Effectiveness of Disclosure Controls and Procedures

Under the supervision and with the participation of our management, including our principal executive officer and principal financial officer, we conducted an evaluation of our disclosure controls and procedures, as such term is defined in Rule 13a-15(e) promulgated under the Exchange Act, as of the end of the period covered by this Annual Report on Form 10-K. The evaluation of our disclosure controls and procedures included a review of the disclosure controls’ and procedures’ objectives, design, implementation and the effect of the controls and procedures on the information generated for use in this report. In the course of our evaluation, we sought to identify data errors, control problems or acts of fraud and to confirm the appropriate corrective actions, including process improvements, were being undertaken. Based on this evaluation, our principal executive officer and principal financial officer concluded that our disclosure controls and procedures were effective as of the end of the period covered by this Annual Report on Form 10-K.

Management’s Report on Internal Control Over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Exchange Act Rule 13a-15(f). Under the supervision and with the participation of our management, including our principal executive officer and principal financial officer, we conducted an evaluation of the effectiveness of our internal control over financial reporting based on the framework in Internal Control – Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework), as of December 31, 2015, the end of the period covered by this Annual Report on Form 10-K. Based on our evaluation under the framework in Internal Control – Integrated Framework, our management concluded that our internal control over financial reporting was effective as of December 31, 2015.

Ernst & Young LLP, the independent registered public accounting firm that audited the financial statements included in this Annual Report on Form 10-K, has issued an attestation report on the effectiveness of our internal control over financial reporting as of December 31, 2015. That report is included herein.

Changes in Internal Controls

There has been no change in our internal control over financial reporting during the three months ended December 31, 2015, that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

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Report of Independent Registered Public Accounting Firm

The Board of Directors and Shareholders Vical Incorporated

We have audited Vical Incorporated’s internal control over financial reporting as of December 31, 2015, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) (the COSO criteria). Vical Incorporated’s management is responsible for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management’s Report on Internal Controls over Financial Reporting. Our responsibility is to express an opinion on the company’s internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, Vical Incorporated maintained, in all material respects, effective internal control over financial reporting as of December 31, 2015, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the balance sheets of Vical Incorporated as of December 31, 2015 and 2014, and the related statements of operations, comprehensive loss, stockholders' equity and cash flows for each of the three years in the period ended December 31, 2015 and our report dated March 14, 2016 expressed an unqualified opinion thereon. 

/s/ Ernst & Young LLP

San Diego, California

March 14, 2016

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ITEM 9B. OTHER INFORMATION

None.

PART III

ITEM 10. DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

The information required by this item and not included in Part I, Item 1 of this Annual Report on Form 10-K is incorporated by reference from our Proxy Statement for our 2016 Annual Meeting of Stockholders, or our Proxy Statement.

ITEM 11. EXECUTIVE COMPENSATION

The information required by this item is incorporated by reference from our Proxy Statement.

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS

The information required by this item is incorporated by reference from our Proxy Statement.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

The information required by this item is incorporated by reference from our Proxy Statement.

ITEM 14. PRINCIPAL ACCOUNTING FEES AND SERVICES

The information required by this item is incorporated by reference from our Proxy Statement.

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PART IV

ITEM 15. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

(a)(1) Financial Statements

The following independent registered public accounting firms’ reports and our financial statements are filed as part of this Annual Report:

Report of Independent Registered Public Accounting Firm

Balance Sheets as of December 31, 2015 and 2014

Statements of Operations for each of the three years in the period ended December 31, 2015

Statements of Comprehensive Loss for each of the three years in the period ended December 31, 2015

Statements of Stockholders’ Equity for each of the three years in the period ended December 31, 2015

Statements of Cash Flows for each of the three years in the period ended December 31, 2015

Notes to Financial Statements

(2) Financial Statement Schedules

The schedules required to be filed by this item have been omitted because of the absence of conditions under which they are required, or because the required information is included in the financial statements or the notes thereto.

(3) Exhibits

See the list in paragraph (b) below. Each management contract or compensatory plan or arrangement required to be identified by this item is so designated in such list.

(b) Exhibits

Exhibit Number	Description of Document
3.1(i)(1)	Restated Certificate of Incorporation.
3.2(ii)(2)	Amended and Restated Bylaws of the Company.
3.3(i)(2)	Certificate of Amendment to Restated Certificate of Incorporation.
3.4(i)(3)	Certificate of Amendment to Restated Certificate of Incorporation.
4.1(1)	Specimen Common Stock Certificate.
10.1(4)a	Amended and Restated Stock Incentive Plan of Vical Incorporated.
10.2(5)a	Form of Indemnity Agreement between the Company and its directors and officers.
10.3(6)a	Vical Incorporated Non-Employee Director Compensation Policy.
10.4(7)a	Form of Delayed Issuance Stock Purchase Election Agreement, as amended, under the Amended and Restated Stock Incentive Plan (with deferral election).
10.5(8)a	Form of Delayed Issuance Stock Purchase Election Agreement, as amended, under the Amended and Restated Stock Incentive Plan.
10.6(9)a	Restated employment letter dated January 9, 2009, between the Company and Vijay B. Samant.
10.7(10) a	Employment Agreement dated January 14, 2005, between the Company and Anthony A. Ramos.
10.8(11)a	Severance Agreement dated January 23, 2015, between the Company and Anthony A. Ramos.
10.9(12) a	Employment Agreement dated August 25, 2003, between the Company and Larry Smith.
10.10(13)a	Severance Agreement dated January 23, 2015, between the Company and Larry Smith.
10.11(14)b	U.S. License Agreement dated July 12, 2011, between the Company and Astellas Pharma Inc.
10.12(15)b	Ex-U.S. License Agreement dated July 12, 2011, between the Company and Astellas Pharma Inc.

65

Exhibit Number	Description of Document
10.13(16)b	Supply and Services Agreement dated July 12, 2011, between the Company and Astellas Pharma Inc.
10.14(17)	Letter agreement dated July 12, 2011, related to the U.S. License Agreement dated July 12, 2011, between the Company and Astellas Pharma Inc.
10.15(18)b	1st Amendment dated August 6, 2012, to U.S. License Agreement Between Vical Incorporated and Astellas Pharma Inc.
10.16(19)b	1st Amendment dated August 6, 2012, to Ex-U.S. License Agreement Between Vical Incorporated and Astellas Pharma Inc.
10.17(20)b	1st Amendment dated August 6, 2012, to Supply and Services Agreement Between Vical Incorporated and Astellas Pharma Inc.
10.18(21)b	License Agreement dated March 24, 2015, between the Company and Astellas Pharma Inc.
10.19(22)b	Amendment No. 1 dated August 31, 2015, to License Agreement dated March 25, 2015, between the Company and Astellas Pharma Inc.
10.20(23)b	License Agreement dated December 7, 2001, between the Company and CytRx Corporation.
10.21(24)	Letter Agreement dated July 5, 2011, related to the License Agreement dated December 7, 2001, between the Company and CytRx Corporation.
10.22(25)b	Exclusive License Agreement dated February 3, 2003, between the Company and City of Hope.
10.23(26)	Letter agreement dated July 7, 2011, related to the Exclusive License Agreement dated February 3, 2003, between the Company and City of Hope.
10.24(27)	Lease dated January 30, 2002, between the Company and Kilroy Realty, L.P. a Delaware Limited Partnership.
23.1	Consent of Independent Registered Public Accounting Firm.
31.1	Certification of Vijay B. Samant, Chief Executive Officer and acting Chief Financial Officer, pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1	Certification of Vijay B. Samant, Chief Executive Officer and acting Chief Financial Officer, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema Document
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document
101.LAB	XBRL Taxonomy Extension Label Linkbase Document
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document

(1) Incorporated by reference to the exhibit of the same number filed with the Company’s Registration Statement on Form S-3 (No. 33-95812) filed on August 15, 1995.

(2) Incorporated by reference to the exhibit of the same number filed with the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2010.

(3) Incorporated by reference to Exhibit 4.2 to the Company’s Registration Statement on Form S-8 (No. 333-135398) filed on June 23, 2006.

(4) Incorporated by reference to Exhibit 99.1 to the Company’s Current Report on Form 8-K filed on May 28, 2013.

(5) Incorporated by reference to Exhibit 10.3 to the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2002.

(6) Incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2014.

(7) Incorporated by reference to Exhibit 10.58 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2009.

(8) Incorporated by reference to Exhibit 10.59 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2009.

(9) Incorporated by reference to Exhibit 99.1 to the Company’s Current Report on Form 8-K filed on January 15, 2009.

(10) Incorporated by reference to Exhibit 10.7 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2013.

66

(11) Incorporated by reference to Exhibit 10.8 to the Company’s Annual Report on Form 10-K for the year ended December31,2014.

(12) Incorporated by reference to Exhibit 10.11 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2013.

(13) Incorporated by reference to Exhibit 10.12 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2014.

(14) Incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2011.

(15) Incorporated by reference to Exhibit 10.2 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2011.

(16) Incorporated by reference to Exhibit 10.3 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2011.

(17) Incorporated by reference to Exhibit 99.4 to the Company’s Current Report on Form 8-K filed on January 5, 2012.

(18) Incorporated by reference to Exhibit 10.3 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2012.

(19) Incorporated by reference to Exhibit 10.4 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2012.

(20) Incorporated by reference to Exhibit 10.5 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2012.

(21) Incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2015.

(22) Incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2015.

(23) Incorporated by reference to Exhibit 99 to CytRx Corporation’s Current Report on Form 8-K filed on December 21, 2001.

(24) Incorporated by reference to Exhibit 99.2 to the Company’s Current Report on Form 8-K filed on January 5, 2012.

(25) Incorporated by reference to Exhibit 10.4 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2011.

(26) Incorporated by reference to the exhibit 99.3 to the Company’s Current Report on Form 8-K filed on January 5, 2012.

(27) Incorporated by reference to Exhibit 10.27 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2001.

a Indicates management contract or compensatory plan or arrangement.

b Confidential treatment of certain portions of this agreement has been requested and/or received and such portions have been omitted and filed separately with the SEC pursuant to Rule 24b-2 under the Securities Exchange Act of 1934.

67

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: March 14, 2016

VICAL INCORPORATED
By:	/S/    VIJAY B. SAMANT
	Vijay B. Samant
	President and Chief Executive Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

/S/    VIJAY B. SAMANT	President, Chief Executive Officer and Director	March 14, 2016
Vijay B. Samant	(Principal Executive and Financial Officer)
/S/    ANTHONY A. RAMOS	Vice President Finance, Chief Accounting Officer	March 14, 2016
Anthony A. Ramos	(Principal Accounting Officer)
/S/    R. GORDON DOUGLAS, M.D.	Chairman of the Board of Directors	March 14, 2016
R. Gordon Douglas, M.D.
/S/    RICHARD M. BELESON	Director	March 14, 2016
Richard M. Beleson
/S/    GARY A. LYONS	Director	March 14, 2016
Gary A. Lyons
/S/    ROBERT C. MERTON, PH.D.	Director	March 14, 2016
Robert C. Merton, Ph.D.
/S/    GEORGE J. MORROW	Director	March 14, 2016
George J. Morrow
/S/    Thomas E. Shenk, PH.D.	Director	March 14, 2016
Thomas E. Shenk, Ph.D.

68

EX-23.1

Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the following Registration Statements:

1) Registration Statement (Form S-8 No. 333-30181) pertaining to the 1992 Stock Plan of Vical Incorporated,

2) Registration Statement (Form S-8 No. 333-80681) pertaining to the Stock Incentive Plan of Vical Incorporated,

3) Registration Statement (Form S-8 No. 333-60293) pertaining to the Stock Incentive Plan of Vical Incorporated,

4) Registration Statement (Form S-8 No. 333-66254) pertaining to the Stock Incentive Plan of Vical Incorporated,

5) Registration Statement (Form S-8 No. 333-97019) pertaining to the Stock Incentive Plan of Vical Incorporated,

6) Registration Statement (Form S-8 No. 333-107581) pertaining to the Stock Incentive Plan of Vical Incorporated,

7) Registration Statement (Form S-8 No. 333-116951) pertaining to the Amended and Restated Stock Incentive Plan of Vical Incorporated,

8) Registration Statement (Form S-8 No. 333-135266) pertaining to the Amended and Restated Stock Incentive Plan of Vical Incorporated,

9) Registration Statement (Form S-8 No. 333-143885) pertaining to the Amended and Restated Stock Incentive Plan of Vical Incorporated,

10) Registration Statement (Form S-8 No. 333-169344) pertaining to the Amended and Restated Stock Incentive Plan of Vical Incorporated,

11) Registration Statement (Form S-8 No. 333-183215) pertaining to the Amended and Restated Stock Incentive Plan of Vical Incorporated,

12) Registration Statement (Form S-8 No. 333-190343) pertaining to the Amended and Restated Stock Incentive Plan of Vical Incorporated, and

13) Registration Statement (Form S-3, No. 333-204462) of Vical Incorporated;

of our reports dated March 14, 2016, with respect to the financial statements of Vical Incorporated and the effectiveness of internal control over financial reporting of Vical Incorporated included in this Annual Report (Form 10-K) of Vical Incorporated for the year ended December 31, 2015.

/s/ Ernst & Young LLP

San Diego, California

March 14, 2016

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Vijay B. Samant, certify that:

1. I have reviewed this Annual Report on Form 10-K of Vical Incorporated;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. I am responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under my supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to me by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under my supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report my conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s fourth fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. I have disclosed, based on my most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: March 14, 2016	By:	/s/    Vijay B. Samant
		Vijay B. Samant
		Chief Executive Officer and
		Acting Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (18 U.S.C. § 1350, as adopted), Vijay B. Samant, the Chief Executive Officer and Acting Chief Financial Officer of Vical Incorporated (the “Company”), hereby certifies that, to the best of his knowledge:

1. The Company’s Annual Report on Form 10-K for the period ended December 31, 2015, to which this Certification is attached as Exhibit 32.1 (the “Annual Report”), fully complies with the requirements of Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934, as amended; and

2. The information contained in the Annual Report fairly presents, in all material respects, the financial condition of the Company at the end of the period covered by the Annual Report and results of operations of the Company for the period covered by the Annual Report.

Dated: March 14, 2016

/S/ Vijay B. Samant

Vijay B. Samant

Chief Executive Officer and

Acting Chief Financial Officer

THIS CERTIFICATION “ACCOMPANIES” THE ANNUAL REPORT, IS NOT DEEMED FILED WITH THE SEC AND IS NOT TO BE INCORPORATED BY REFERENCE INTO ANY FILING OF THE COMPANY UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED (WHETHER MADE BEFORE OR AFTER THE DATE OF THE ANNUAL REPORT), IRRESPECTIVE OF ANY GENERAL INCORPORATION LANGUAGE CONTAINED IN SUCH FILING. A SIGNED ORIGINAL OF THIS CERTIFICATION HAS BEEN PROVIDED TO THE COMPANY AND WILL BE RETAINED BY THE COMPANY AND FURNISHED TO THE SECURITIES AND EXCHANGE COMMISSION OR ITS STAFF UPON REQUEST.

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Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2015	Feb. 29, 2016	Jun. 30, 2015
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	FY
Trading Symbol	VICL
Entity Registrant Name	VICAL INC
Entity Central Index Key	0000819050
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		91,905,977
Entity Public Float			$ 63,553,157

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Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 13,450	$ 20,471
Marketable securities, available-for-sale	23,258	23,499
Restricted cash	3,246	3,182
Receivables and other assets	4,544	4,178
Total current assets	44,498	51,330
Long-term investments	2,052	1,971
Property and equipment, net	1,873	2,639
Intangible assets, net	1,300	1,660
Other assets	191	379
Total assets	49,914	57,979
Current liabilities:
Accounts payable and accrued expenses	3,912	5,201
Deferred revenue	250	0
Total current liabilities	4,162	5,201
Long-term liabilities:
Deferred rent	$ 359	$ 856
Commitments and contingencies (Notes 6 and 7)
Stockholders’ equity:
Preferred stock, $0.01 par value, 5,000 shares authorized, none issued and outstanding	$ 0	$ 0
Common stock, $0.01 par value, 160,000 shares authorized, 91,544 and 90,334 shares issued and outstanding at December 31, 2015 and 2014, respectively	915	903
Additional paid-in capital	449,343	446,698
Accumulated deficit	(404,905)	(395,667)
Accumulated other comprehensive income (loss)	40	(12)
Total stockholders’ equity	45,393	51,922
Total liabilities and stockholders’ equity	$ 49,914	$ 57,979

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Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2015	Dec. 31, 2014
Statement Of Financial Position [Abstract]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	160,000,000	160,000,000
Common stock, shares issued	91,544,000	90,334,000
Common stock, shares outstanding	91,544,000	90,334,000

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Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues:
Contract revenue	$ 18,860	$ 13,304	$ 5,846
License and royalty revenue	2,090	1,913	1,872
Total revenues	20,950	15,217	7,718
Operating expenses:
Research and development	11,061	11,467	14,558
Manufacturing and production	10,927	10,824	12,698
General and administrative	8,366	9,552	11,814
Total operating expenses	30,354	31,843	39,070
Loss from operations	(9,404)	(16,626)	(31,352)
Other income:
Investment and other income, net	166	134	114
Net loss	$ (9,238)	$ (16,492)	$ (31,238)
Basic and diluted net loss per share	$ (0.10)	$ (0.19)	$ (0.36)
Weighted average shares used in computing basic and diluted net loss per share	91,751	88,786	86,840

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Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (9,238)	$ (16,492)	$ (31,238)
Unrealized gain (loss) on available-for-sale and long-term marketable securities:
Unrealized gain (loss) arising during holding period, net of tax	52	(23)	(236)
Other comprehensive gain (loss)	52	(23)	(236)
Total comprehensive loss	$ (9,186)	$ (16,515)	$ (31,474)

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Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income/(loss) [Member]
Beginning Balance at Dec. 31, 2012	$ 89,086	$ 861	$ 435,915	$ (347,937)	$ 247
Beginning Balance, shares at Dec. 31, 2012		86,136
Net loss	(31,238)			(31,238)
Other comprehensive income (loss)	(236)				(236)
Exercise of stock options and issuance of common stock underlying restricted stock units net of shares withheld to settle withholding taxes	334	$ 7	327
Exercise of stock options and issuance of common stock underlying restricted stock units net of shares withheld to settle withholding taxes, shares		642
Non-cash compensation expense related to grant of equity based compensation	3,466		3,466
Ending Balance at Dec. 31, 2013	61,412	$ 868	439,708	(379,175)	11
Ending Balance, shares at Dec. 31, 2013		86,778
Net loss	(16,492)			(16,492)
Other comprehensive income (loss)	(23)				(23)
Issuance of common stock	3,923	$ 33	3,890
Issuance of common stock, shares		3,292
Issuance of common stock underlying restricted stock units net of shares withheld to settle withholding taxes	(57)	$ 2	(59)
Issuance of common stock underlying restricted stock units net of shares withheld to settle withholding taxes, shares		264
Non-cash compensation expense related to grant of equity based compensation	3,159		3,159
Ending Balance at Dec. 31, 2014	$ 51,922	$ 903	446,698	(395,667)	(12)
Ending Balance, shares at Dec. 31, 2014	90,334	90,334
Net loss	$ (9,238)			(9,238)
Other comprehensive income (loss)	52				52
Issuance of common stock	775	$ 9	766
Issuance of common stock, shares		861
Issuance of common stock underlying restricted stock units net of shares withheld to settle withholding taxes	(20)	$ 3	(23)
Issuance of common stock underlying restricted stock units net of shares withheld to settle withholding taxes, shares		349
Non-cash compensation expense related to grant of equity based compensation	1,902		1,902
Ending Balance at Dec. 31, 2015	$ 45,393	$ 915	$ 449,343	$ (404,905)	$ 40
Ending Balance, shares at Dec. 31, 2015	91,544	91,544

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Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net loss	$ (9,238)	$ (16,492)	$ (31,238)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,159	1,663	2,213
Write-off of abandoned patents and licensed technology	230	350	889
Gain on sale of property and equipment	(1)	(15)	(7)
Compensation expense related to stock options and awards	1,902	3,159	3,466
Purchase of technology license with common stock	775	0	0
Changes in operating assets and liabilities:
Receivables and other assets	(178)	412	(2,626)
Accounts payable and accrued expenses	(1,415)	1,635	(2,188)
Deferred revenue	250	(150)	0
Deferred rent	(432)	(368)	(307)
Net cash used in operating activities	(6,948)	(9,806)	(29,798)
Cash flows from investing activities:
Maturities of marketable securities	20,183	10,556	30,974
Purchases of marketable securities	(20,114)	(22,643)	(5,137)
Purchases of property and equipment	(72)	(85)	(332)
Proceeds from the sale of property and equipment	3	15	49
Patent and licensed technology expenditures	(53)	(269)	(412)
Net cash (used in) provided by investing activities	(53)	(12,426)	25,142
Cash flows from financing activities:
Net proceeds from issuance of common stock	3	3,925	816
Payment of withholding taxes for net settlement of restricted stock units	(23)	(59)	(482)
Net cash (used in) provided by financing activities	(20)	3,866	334
Net decrease in cash and cash equivalents	(7,021)	(18,366)	(4,322)
Cash and cash equivalents at beginning of year	20,471	38,837	43,159
Cash and cash equivalents at end of year	$ 13,450	$ 20,471	$ 38,837

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Organization and Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Organization and Summary of Significant Accounting Policies

1. Organization and Summary of Significant Accounting Policies

Organization and Business Activity

Vical Incorporated, or the Company, a Delaware corporation, was incorporated in April 1987 and has devoted substantially all of its resources since that time to its research and development programs. The Company researches and develops biopharmaceutical products, including those based on its patented DNA delivery technologies for the prevention and treatment of serious or life-threatening diseases.

All of the Company’s potential products are in research and development phases. No revenues have been generated from the sale of any such products, nor are any such revenues expected for at least the next several years. The Company earns revenue from research and development agreements with pharmaceutical collaborators and from contract manufacturing agreements. Most of the Company’s product candidates will require significant additional research and development efforts, including extensive preclinical and clinical testing. All product candidates that advance to clinical testing will require regulatory approval prior to commercial use, and will require significant costs for commercialization. There can be no assurance that the Company’s research and development efforts, or those of its collaborators, will be successful. The Company expects to continue to incur substantial losses and not generate positive cash flows from operations for at least the next several years. No assurance can be given that the Company can generate sufficient product revenue to become profitable or generate positive cash flows from operations.

Basis of Presentation

These financial statements are prepared in conformity with accounting principles generally accepted in the United States of America.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make informed estimates and assumptions that affect the amounts reported in the financial statements and disclosures made in the accompanying notes. Actual results could differ materially from those estimates.

Cash, Cash Equivalents and Marketable Securities

Cash and cash equivalents consist of cash and highly liquid securities with original maturities at the date of acquisition of ninety days or less and can be liquidated without prior notice or penalty. Investments with an original maturity of more than ninety days are considered marketable securities and have been classified by management as available-for-sale. These investments are classified as current assets, even though the stated maturity date may be one year or more beyond the current balance sheet date which reflects management’s intention to use the proceeds from sales of these securities to fund its operations, as necessary. Such investments are carried at fair value, with unrealized gains and losses included as a separate component of stockholders’ equity. Realized gains and losses from the sale of available-for-sale securities or the amounts, net of tax, reclassified out of accumulated other comprehensive income (loss), if any, are determined on a specific identification basis.

Restricted Cash

The Company is required to maintain a letter of credit securing an amount equal to twelve months of the current monthly installment of base rent for the term of the lease for its facilities, which ends in August 2017. Under certain circumstances the Company may be able to eliminate the need for the letter of credit. At December 31, 2015 and 2014, restricted cash of $3.2 million  was pledged as collateral for the letter of credit.

Concentrations of Credit Risk

Financial instruments that potentially subject the Company to significant concentrations of credit risk consist primarily of cash equivalents, marketable securities and receivables. The Company invests its excess cash in debt instruments of financial institutions and of corporations with above average credit ratings, in U.S. government obligations, and in money market funds and certificates of deposits at financial institutions.

Property and Equipment

Property and equipment is recorded at cost and depreciation is computed using the straight-line method over the estimated useful lives of the assets. Assets acquired pursuant to capital lease arrangements and leasehold improvements are amortized using the straight-line method over the shorter of the life of the remaining lease term or the remaining useful life of the asset. Manufacturing equipment has estimated useful lives of ten years. All other property and equipment have estimated useful lives of 3 to 5 years. Maintenance and repairs of property and equipment are expensed as incurred.

Intangible Assets

Intangible assets include certain costs related to patent applications. The Company capitalizes license fees paid to acquire access to proprietary technology if the technology is expected to have alternative future use in multiple research and development projects. The cost of licensed technology rights is amortized using the straight-line method over the estimated useful life of the technology. Certain costs related to patent applications are amortized over the estimated economic lives of the patents, which is generally 20 years and typically commences at the time the patent application is filed. As of December 31, 2015, the weighted average amortization period of capitalized patent costs is approximately 9 years. Amortization expense for licensed technology and capitalized patent cost is included in research and development expenses.

Impairment of Long-lived Assets

The Company reviews long-lived assets for impairment at least annually, quarterly for intangible assets, and whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Should an impairment exist, the impairment loss would be measured based on the excess of the carrying amount of the asset over the asset’s estimated fair value and the loss recognized in current earnings. The Company recognized research and development expense of approximately $0.2 million, $0.4 million and $0.9 million for the years ended December 31, 2015, 2014 and 2013, respectively, related to patents for which the value was deemed to be impaired.  2013 also includes expense relating to licensed technology for which the value was deemed to be impaired.

Revenue Recognition

Revenue is recognized when the four basic criteria of revenue recognition are met: (1) persuasive evidence of an arrangement exists; (2) delivery has occurred or services rendered; (3) the fee is fixed or determinable; and (4) collectability is reasonably assured. Certain of the Company’s revenue is generated through manufacturing contracts and stand-alone license agreements.

The Company has entered into multiple-element arrangements. In order to account for the multiple-element arrangements, the Company identifies the deliverables included within the agreement and evaluates which deliverables represent separate units of accounting. Analyzing the arrangement to identify deliverables requires the use of judgment, and each deliverable may be an obligation to deliver services, a right or license to use an asset, or another performance obligation.

Multiple-element arrangements

The Company has entered into multiple-element arrangements. In order to account for the multiple-element arrangements, the Company identifies the deliverables included within the agreement and evaluates which deliverables represent separate units of accounting. Analyzing the arrangement to identify deliverables requires the use of judgment, and each deliverable may be an obligation to deliver services, a right or license to use an asset, or another performance obligation. The delivered item(s) must have value to the customer on a standalone basis and, if the arrangement includes a general right of return relative to the delivered item, delivery or performance of the undelivered item(s) is considered probable and substantially in the Company’s control.

A delivered item is considered a separate unit of accounting when the delivered item has value to the partner on a standalone basis based on the consideration of the relevant facts and circumstances for each arrangement. Factors considered in this determination include the research capabilities of the partner and the availability of research expertise in this field in the general marketplace. Arrangement consideration is allocated at the inception of the agreement to all identified units of accounting based on their relative selling price. The relative selling price for each deliverable is determined using vendor specific objective evidence, or VSOE, of selling price or third-party evidence of selling price if VSOE does not exist. If neither VSOE nor third-party evidence of selling price exists, the Company uses its best estimate of the selling price for the deliverable. The amount of allocable arrangement consideration is limited to amounts that are fixed or determinable. The consideration received is allocated among the separate units of accounting, and the applicable revenue recognition criteria are applied to each of the separate units. Changes in the allocation of the sales price between delivered and undelivered elements can impact revenue recognition but do not change the total revenue recognized under any agreement. If facts and circumstances dictate that the license has standalone value from the undelivered items, which generally include research and development services and the manufacture of drug products, the license is identified as a separate unit of accounting and the amounts allocated to the license are recognized upon the delivery of the license, assuming the other revenue recognition criteria have been met. However, if the amounts allocated to the license through the relative selling price allocation exceed the upfront license fee, the amount recognized upon the delivery of the license is limited to the upfront fee received. If facts and circumstances dictate that the license does not have standalone value, the transaction price, including any upfront license fee payments received, are allocated to the identified separate units of accounting and recognized as those items are delivered.

The terms of the Company’s partnership agreements provide for milestone payments upon achievement of certain regulatory and commercial events. Under the Milestone Method, the Company recognizes consideration that is contingent upon the achievement of a milestone in its entirety as revenue in the period in which the milestone is achieved only if the milestone is substantive in its entirety. A milestone is considered substantive when it meets all of the following three criteria: 1) The consideration is commensurate with either the entity’s performance to achieve the milestone or the enhancement of the value of the delivered item(s) as a result of a specific outcome resulting from the entity’s performance to achieve the milestone, 2) The consideration relates solely to past performance, and 3) The consideration is reasonable relative to all of the deliverables and payment terms within the arrangement. A milestone is defined as an event (i) that can only be achieved based in whole or in part on either the entity’s performance or on the occurrence of a specific outcome resulting from the entity’s performance, (ii) for which there is substantive uncertainty at the date the arrangement is entered into that the event will be achieved and (iii) that would result in additional payments being due to the Company.

Contract Services, Grant and Royalty Revenue

The Company recognizes revenues from contract services and federal government research grants during the period in which the related expenditures are incurred and related payments for those services are received or collection is reasonably assured. Royalties to be received based on sales of licensed products by the Company’s partners incorporating the Company’s licensed technology are recognized when received.

Accruals for Potential Disallowed Costs on Government Contracts

The Company has contracts with U.S. government agencies under which it bills for direct and indirect costs incurred. These billed costs are subject to audit by government agencies. The Company established accruals of approximately $49,000 at each of December 31, 2015 and 2014 to provide for potential disallowed costs. In the event that the final costs allowed are different from what the Company has estimated, the Company may need to make a change in its estimated accrual, which could also affect its results of operations and cash flow.

Research and Development Costs

Research and development costs are expensed as incurred. Research and development costs include salaries and personnel-related costs, supplies and materials, outside services, costs of conducting preclinical and clinical trials, facilities costs and amortization of intangible assets. The Company accounts for its clinical trial costs by estimating the total cost to treat a patient in each clinical trial, and accruing this total cost for the patient over the estimated treatment period, which corresponds with the period over which the services are performed, beginning when the patient enrolls in the clinical trial. This estimated cost includes payments to the site conducting the trial, and patient-related lab and other costs related to the conduct of the trial. Cost per patient varies based on the type of clinical trial, the site of the clinical trial, the method of administration of the treatment, and the number of treatments that a patient receives. Treatment periods vary depending on the clinical trial. The Company makes revisions to the clinical trial cost estimates in the current period, as clinical trials progress.

Manufacturing and Production Costs

Manufacturing and production costs include expenses related to manufacturing contracts and expenses for the production of plasmid DNA for use in the Company’s research and development efforts. Manufacturing expenses related to manufacturing contracts are deferred and expensed when the related revenue is recognized. Production expenses related to the Company’s research and development efforts are expensed as incurred.

Net Loss Per Share

Basic and diluted net loss per share has been computed using the weighted-average number of shares of common stock outstanding during the period. The weighted-average number of shares used to compute diluted loss per share excludes any assumed exercise of stock options, and the assumed issuance of common stock under restricted stock units, or RSUs, as the effect would be antidilutive. Common stock equivalents of 0.3 million, 0.5 million and 0.9 million for the years ended December 31, 2015, 2014 and 2013, respectively, were excluded from the calculation because of their antidilutive effect.

Fair Value of Financial Instruments

The carrying amounts of cash, cash equivalents, restricted cash, marketable securities, receivables, accounts payable and accrued expenses at December 31, 2015 and 2014, are considered to approximate fair value because of the short term nature of those items.

Income Taxes

The impact of an uncertain income tax position on the income tax return must be recognized at the largest amount that is more-likely-than-not to be sustained upon audit by the relevant taxing authority. An uncertain income tax position will not be recognized if it has less than a 50% likelihood of being sustained. There were no unrecognized tax benefits recorded by the Company as of the date of adoption in 2007. There are no unrecognized tax benefits included in the balance sheets that would, if recognized, affect the effective tax rate.

Deferred income taxes result primarily from temporary differences between financial and tax reporting. Deferred tax assets and liabilities are determined based on the difference between the financial statement bases and the tax bases of assets and liabilities using enacted tax rates. A valuation allowance is established to reduce a deferred tax asset to the amount that is expected more likely than not to be realized.

Comprehensive Loss

Comprehensive loss consists of net loss and certain changes in equity that are excluded from net loss. Comprehensive loss for the years ended December 31, 2015, 2014 and 2013, has been reflected in the accompanying Statements of Comprehensive Loss. Accumulated other comprehensive income (loss), which is included in stockholders’ equity, represents unrealized gains and losses on marketable securities.

Business Segments

The Company operates in one business segment, which is within the United States, and is dedicated to research and development of DNA delivery technology.

Stock-Based Compensation

The Company records its compensation expense associated with stock options and other forms of equity compensation based on their fair value at the date of grant using the Black-Scholes-Merton option pricing model. Stock-based compensation includes amortization related to stock option awards based on the estimated grant date fair value. Stock-based compensation expense related to stock options includes an estimate for forfeitures and the portion that is ultimately expected to vest is recognized ratably over the vesting period of the option. In addition, the Company records expense related to RSUs granted based on the fair value of those awards on the grant date. The fair value related to the RSUs is amortized to expense over the vesting term of those awards. Stock-based compensation expense related to RSUs includes an estimate for forfeitures and the portion expected to vest is recognized ratably over the requisite service period. The expected forfeiture rate of all equity based compensation is based on observed historical patterns of the Company’s employees and is estimated to be 8.75%, 8.75% and 11.2% annually for each of the years ended December 31, 2015, 2014 and 2013, respectively .

The fair value of each option award is estimated on the date of grant using the Black-Scholes-Merton valuation model using the assumptions noted in the following table. The expected life of options is based on the Company’s observed historical exercise patterns. The expected volatility of stock options is based upon the historical volatility of the Company’s stock commensurate with the expected life of the option. The risk-free interest rate is based on the implied yield on a U.S. Treasury zero-coupon issue with a remaining term equal to the expected term of the option. The dividend yield reflects that the Company has not paid any cash dividends since inception and does not intend to pay any cash dividends in the foreseeable future.

	Year Ended December 31,
	2015		2014		2013
Assumptions:
Assumed risk-free interest rate		1.34%		1.63%		1.14%
Assumed volatility		68%		73%		72%
Average expected option life	4.5 years		4.5 years		4.5 years
Expected dividend yield		—		—		—

Recent Accounting Pronouncements

In July 2013, the FASB issued guidance on the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. The guidance was effective prospectively for fiscal years, and interim periods within those years, beginning after December 15, 2013. The adoption of this standard beginning with the first quarter of 2014 did not have a material impact on the Company’s consolidated financial statements.

In May 2014, the FASB issued guidance that outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. The guidance provides that an entity recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This guidance also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments, and assets recognized from costs incurred to obtain or fulfill a contract. The guidance allows for either full retrospective or modified retrospective adoption and will become effective for the Company in the first quarter of 2017. The Company is evaluating the alternative transition methods and the potential effects of the adoption of this update on its financial statements.

In August 2014, the FASB issued an amendment to the accounting guidance related to the evaluation of an entity to continue as a going concern. The amendment establishes management’s responsibility to evaluate whether there is substantial doubt about an entity’s ability to continue as a going concern in connection with preparing financial statements for each annual and interim reporting period. The amendment also gives guidance to determine whether to disclose information about relevant conditions and events when there is substantial doubt about an entity’s ability to continue as a going concern. The amended guidance is effective prospectively for fiscal years beginning after December 15, 2016. The new guidance will not have an impact on the Company’s financial position, results of operations or cash flows.

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Short-Term Marketable Securities

12 Months Ended

Dec. 31, 2015

Investments Debt And Equity Securities [Abstract]

Short-Term Marketable Securities

2. Short-Term Marketable Securities

The following is a summary of short-term marketable securities classified as available-for-sale (in thousands):

December 31, 2015	Amortized Cost		Unrealized Gain		Unrealized Loss		Market Value
U.S. treasuries	$	7,027	$	—	$	8	$	7,019
Corporate bonds		1,000		—		—		1,000
Certificates of deposit		15,239		—		—		15,239
	$	23,266	$	—	$	8	$	23,258

December 31, 2014	Amortized Cost		Unrealized Gain		Unrealized Loss		Market Value
U.S. treasuries	$	5,558	$	—	$	1	$	5,557
Government-sponsored enterprise securities		7,499		—		6		7,493
Corporate bonds		2,025		—		5		2,020
Certificates of deposit		8,429		—		—		8,429
	$	23,511	$	—	$	12	$	23,499

At December 31, 2015, none of these securities were scheduled to mature outside of one year. There were no net realized gains (losses) on sales of available-for-sale securities for the years ended December 31, 2015, 2014 and 2013. None of these investments have been in a continuous unrealized loss position for more than 12 months as of December 31, 2015 and 2014.

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Long-Term Investments

12 Months Ended

Dec. 31, 2015

Investments All Other Investments [Abstract]

Long-Term Investments

3. Long-Term Investments

As of December 31, 2015, the Company held an auction rate security with a par value of $2.5 million. This auction rate security has not experienced a successful auction since the liquidity issues experienced in the global credit and capital markets in 2008. As a result the security is classified as a long-term investment as it is scheduled to mature in 2038. The security was rated A- by Standard and Poor’s as of December 31, 2015. The security continues to pay interest according to its stated terms.

The valuation of the Company’s auction rate security is subject to uncertainties that are difficult to predict. The fair value of the security is estimated utilizing a discounted cash flow analysis. The key drivers of the valuation model include the expected term, collateral underlying the security investment, the creditworthiness of the counterparty, the timing of expected future cash flows, discount rates, liquidity and the expected holding period. The security was also compared, when possible, to other observable market data for securities with similar characteristics. As of December 31, 2015, the inputs used in the Company’s discounted cash flow analysis assumed an interest rate of 1.72%, an estimated redemption period of five years and a discount rate of 1.0%.  Based on the valuation of the security, the Company has recognized cumulative losses of $0.5 million as of December 31, 2015, none of which were realized during the year ended December 31, 2015. The losses, when recognized, are included in investment and other income. The market value of the security has partially recovered. Included in other comprehensive (loss) income are unrealized gains (losses) of $48,000, $(9,000) and $(0.2) million for the years ended December 31, 2015, 2014 and 2013, respectively. As of December 31, 2015, the Company had recorded cumulative unrealized gains of $0.2 million. The resulting carrying value of the auction rate security at December 31, 2015, was $2.1 million. Any future decline in market value may result in additional losses being recognized.

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Fair Value Measurements

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Fair Value Measurements

4. Fair Value Measurements

The Company measures fair value as an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. Fair value measurements are based on a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows:

· Level 1: Observable inputs such as quoted prices in active markets;

· Level 2: Inputs, other than the quoted prices in active markets, that are observable either directly or indirectly; and

· Level 3: Unobservable inputs for which there is little or no market data, which require the reporting entity to develop its own assumptions.

Cash equivalents, marketable securities and long-term investments measured at fair value are classified in the table below in one of the three categories described above (in thousands):

	Fair Value Measurements
December 31, 2015	Level 1		Level 2		Level 3		Total
Certificates of deposit	$	15,239	$	—	$	—	$	15,239
U.S. treasuries		7,019		—		—		7,019
Corporate bonds		—		1,000		—		1,000
Auction rate securities		—		—		2,052		2,052
	$	22,258	$	1,000	$	2,052	$	25,310

	Fair Value Measurements
December 31, 2014	Level 1		Level 2		Level 3		Total
Certificates of deposit	$	8,674	$	—	$	—	$	8,674
Money market funds		169		—		—		169
U.S. treasuries		5,557		—		—		5,557
Corporate bonds		—		2,020		—		2,020
Government-sponsored enterprise securities		—		7,493		—		7,493
Auction rate securities		—		—		1,971		1,971
	$	14,400	$	9,513	$	1,971	$	25,884

The Company’s investments in U.S. treasury securities, certificates of deposit and money market funds are valued based on publicly available quoted market prices for identical securities as of December 31, 2015. The Company determines the fair value of other government-sponsored enterprise related securities with the aid of valuations provided by third parties using proprietary valuation models and analytical tools. These valuation models and analytical tools use market pricing or similar instruments that are both objective and publicly available, including matrix pricing or reported trades, benchmark yields, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids and/or offers. The Company validates the valuations received from its primary pricing vendors for its level 2 securities by examining the inputs used in that vendor’s pricing process and determines whether they are reasonable and observable. The Company also compares those valuations to recent reported trades for those securities. The Company did not adjust any of the valuations received from these third parties with respect to any of its level 2 securities at December 31, 2015. The valuation of the Company’s investment in auction rate securities is more fully described in Note 3.

Activity for assets measured at fair value using significant unobservable inputs (Level 3) is presented in the table below (in thousands):

Balance at December 31, 2014	$	1,971
Total net realized gains included in earnings		—
Total net unrealized gains included in other    comprehensive income		81
Net transfers in and/out of Level 3		—
Balance at December 31, 2015	$	2,052
Amount of total losses for the period included in net loss    attributable to the change in unrealized gains or losses    relating to assets still held at December 31, 2015	$	—

Total cumulative unrealized losses of $0.4 million relate to Level 3 assets still held as of December 31, 2015, none of which were recognized during the years ended December 31, 2015, 2014 and 2013. The losses, when recognized, are included in investment and other income.

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Other Balance Sheet Accounts

12 Months Ended

Dec. 31, 2015

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Other Balance Sheet Accounts

5. Other Balance Sheet Accounts

Property and equipment consisted of the following at December 31 (in thousands):

	2015			2014
Equipment	$	17,425		$	17,515
Leasehold improvements		8,048			8,048
		25,473			25,563
Less accumulated depreciation and amortization		(23,600	)		(22,924	)
	$	1,873		$	2,639

Depreciation and amortization of equipment and leasehold improvements for the years ended December 31, 2015, 2014 and 2013, was $0.9 million, $1.4 million and $1.6 million, respectively.

Intangible assets consisted of the following at December 31 (in thousands):

	2015			2014
Patent application costs		2,252			2,972
Accumulated amortization patent costs		(952	)		(1,312	)
	$	1,300		$	1,660

Amortization of licensed technology rights and patent application costs for the years ended December 31, 2015, 2014 and 2013, was $0.2 million, $0.2 million and $0.4 million, respectively. Estimated annual amortization for these assets is $0.2 million for the years ended 2016 and 2017, $0.1 million for each of the years in the period from 2018 to 2020, and $0.6 million being recognized thereafter.

Accounts payable and accrued expenses consisted of the following at December 31 (in thousands):

	2015		2014
Employee compensation	$	2,220	$	2,471
Clinical trial accruals		102		1,686
Accounts payable		733		227
Deferred rent		496		432
Other accrued liabilities		361		385
	$	3,912	$	5,201

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Significant Contract, License and Royalty Agreements

12 Months Ended

Dec. 31, 2015

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Significant Contract, License and Royalty Agreements

6. Significant Contract, License and Royalty Agreements

Contracts

IPPOX

In April 2015, the Company entered into a $4.1 million contract with the IPPOX Foundation to manufacture HIV-antigen plasmid DNA as a component of vaccine regimens to be evaluated in clinical trials for the prevention of HIV infection. IPPOX is a Swiss non-profit foundation that participates in the conduct of HIV vaccine clinical trials under the auspices of the Pox-Protein Public-Private Partnership, or P5, funded by theBill & Melinda Gates Foundation and the U.S. National Institute of Allergy and Infectious Diseases, or NIAID.  These plasmids were shipped and the related revenue of $4.1 million was recognized in December 2015. This contract builds upon the Company’s 2010 agreement with IPPOX to manufacture plasmid DNA for HIV vaccine clinical trials.

Astellas

In July 2011, the Company entered into license agreements with Astellas Pharma Inc., or Astellas, granting Astellas exclusive, worldwide, royalty-bearing licenses under certain of the Company’s know-how and intellectual property to develop and commercialize certain products containing plasmids encoding certain forms of glycoprotein B and/or phosphoprotein 65, including ASP0113 but excluding CyMVectin™. Under the agreements, Astellas is responsible for the worldwide development and commercialization of products in the licensed field, at its expense, and has agreed to use commercially reasonable efforts to develop, obtain regulatory approval for and commercialize at least one licensed product for use in certain immunocompromised patients in the licensed field in the United States and certain other major markets. Under the terms of the license agreements, Astellas paid a nonrefundable upfront license fee of $25.0 million.

In 2012, the Company received a $10.0 million milestone payment upon finalization of the trial design for a Phase 3 registration trial of ASP0113 in hematopoietic stem cell transplant recipients. The Company is also entitled to receive additional cash payments potentially totaling $95.0 million for achievement of certain milestones through commercial launch and to receive double-digit royalties on net sales of products. In addition, the Company has an option to co-promote ASP0113 in the United States. Under the terms of a supply and services agreement entered into by the Company and Astellas on the same date, the Company agreed to perform certain development and regulatory activities, at Astellas’ expense, and to supply licensed products to Astellas, at Astellas’ expense, for use in development and initial commercialization activities in the licensed field.

In August 2012, the Company amended its license and supply agreements with Astellas to, among other things, extend the time period that the Company is obligated to supply licensed products for commercial use to Astellas, at Astellas’ expense, modify the allocation of $95.0 million of milestone payments among certain milestones through commercial launch and modify the structure of the royalties on net sales from a fixed double digit royalty to tiered double digit royalties.

The Company identified the deliverables at the inception of the agreements. The Company has determined that the license and related know-how, the development and regulatory services and the drug product supply individually represent separate units of accounting, because each deliverable has standalone value. The best estimated selling prices for these units of accounting was determined based on market conditions, the terms of comparable collaborative arrangements for similar technology in the pharmaceutical and biotechnology industry and entity-specific factors, such as the terms of the Company’s previous collaborative agreements, the Company’s pricing practices and pricing objectives and the nature of the research and development services to be performed for the partner. The arrangement consideration was allocated to the deliverables based on the relative selling price method.

The amount of allocable arrangement consideration is limited to amounts that are fixed or determinable; therefore, the amount allocated to the licenses was limited to the extent of cash received. As a result, during the years ended December 31, 2015, 2014 and 2013, the Company recognized $1.8 million, $1.6 million and $0.7 million, respectively, related to the license fee and know-how. The Company will recognize the amounts allocated to research and development services as revenues under the agreements as the related services are delivered and as reimbursements are received. During the years ended December 31, 2015, 2014 and 2013, the Company recognized $8.7 million, $7.8 million and $4.4 million, respectively, of revenue related to contract services delivered. The Company will recognize as revenue the amounts allocated to the sales of drug product when the sale of that drug product has met all required specifications and the related title and risk of loss and damages have passed to Astellas. During the years ended December 31, 2015, 2014 and 2013, the Company recognized $6.0 million, $5.5 million and $1.2 million, respectively, of revenue related to drug product delivered. The Company is eligible to receive additional cash payments upon the achievement of specified regulatory and commercial milestones. The Company has determined that each of the regulatory and commercial milestones meets the definition of a milestone and that each milestone is substantive in accordance with the milestone method of revenue recognition. Accordingly, the Company expects to recognize such regulatory and commercial milestone payments as revenues under the agreements upon achievement of each milestone.

In-licensing Agreements

Astellas

In March 2015, the Company entered into a license agreement with Astellas which grants to the Company exclusive worldwide license to develop and commercialize a novel antifungal, VL-2397.  As consideration for the rights under the license, the Company issued 861,216 shares of our common stock to Astellas and made an up-front payment of $250,000 in cash. The License Agreement provides for potential development, regulatory and sales milestone payments totaling up to $99.0 million, the vast majority of which are payable upon achievement of commercial and sales milestones, and single-digit royalties on net sales of commercial products. The Company is responsible for the worldwide development, manufacturing and commercialization of licensed products, at the Company’s cost, and we are required to use commercially reasonable efforts with respect to such development and commercialization activities.

The license agreement, unless terminated earlier, will continue until expiration of Vical’s royalty obligations with respect to licensed products. Either party may terminate the license agreement earlier if the other party materially breaches the agreement and does not cure the breach within a specified notice period, or upon the other party’s insolvency.  Astellas may terminate the license agreement earlier if Vical or any of its affiliates or sublicensees oppose or challenge any of the licensed patents. Vical may terminate the license agreement on a country-by-country basis for reasonable scientific, regulatory, commercial, financial, ethical or other reasons.

City of Hope

In 2003, the Company licensed from the City of Hope on an exclusive basis various U.S. patents that provide protection for CMV-related polynucleotide based vaccines, including TransVax^TM and CyMVectin^TM vaccine candidates. The agreement expires upon the last to expire of the patent rights licensed by the Company under the agreement, unless earlier terminated as set forth in the agreement. The City of Hope may terminate the agreement early, in accordance with notice provisions set forth in the agreement, if the Company ceases to operate, fails to make payments when due or materially breaches the agreement. Subject to certain conditions, the Company may terminate the agreement early at any time upon prior written notice to the City of Hope. The Company is also obligated to pay a low double-digit percentage of any payments it receives from the sub-license of products that incorporate the licensed technology. The Company paid the City of Hope $0.1 million under the agreement for each of the years ended December 31, 2015, 2014 and 2013.

CytRx

In 2001, the Company entered into an exclusive agreement with CytRx which grants to the Company the rights to use or sublicense CytRx’s poloxamer technology to enhance viral or non-viral delivery of polynucleotides in all preventive and therapeutic human and animal health applications, including CMV. The agreement excludes applications for four infectious disease vaccine targets that had been licensed to Merck and prostate-specific membrane antigen. In addition, the agreement permits the Company’s use of CytRx’s technology to enhance the delivery of proteins in prime-boost vaccine applications that involve the use of polynucleotides. As part of the agreement, the Company made a $3.8 million up-front payment and agreed to make potential future milestone and royalty payments. The license fee is fully amortized as of December 31, 2013. The Company paid CytRx $0.1 million, $0.1 million and $0.3 million under the agreement for the years ended December 31, 2015, 2014 and 2013, respectively.

Milestone Payments

The Company may be required to make future payments to its licensors based on the achievement of milestones set forth in various in-licensing agreements. In most cases, these milestone payments are based on the achievement of development or regulatory milestones, including the exercise of options to obtain licenses related to specific disease targets, commencement of various phases of clinical trials, filing of product license applications, approval of product licenses from the FDA or a foreign regulatory agency, and the first commercial sale of a related product. Payment for the achievement of milestones under the Company’s in-license agreements is highly speculative and subject to a number of contingencies.

The aggregate amount of additional milestone payments that the Company could be required to pay under its active in-license agreements in place at December 31, 2015, is approximately $106.1 million. These amounts assume that all remaining milestones associated with the milestone payments are met. In the event that product license approval for any of the related products is obtained, the Company may be required to make royalty payments in addition to these milestone payments. Although the Company believes that some of the milestones contained in its in-license agreements may be achieved, it is highly unlikely that a significant number of them will be achieved. Because the milestones are contingent the Company is not in a position to reasonably estimate how much, if any, of the potential milestone payments will ultimately be paid. Additionally, under the in-license agreements, many of the milestone events are related to progress in clinical trials which the Company estimates will take several years to achieve.

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Commitments and Contingencies

12 Months Ended

Dec. 31, 2015

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

7. Commitments and Contingencies

Facility Leases

The Company is currently leasing its facility which has approximately 68,400 square feet of manufacturing, research laboratory and office space. The lease expires in August 2017. The Company has the option to renew the lease for three additional five-year periods beyond its expiration.

The lease related to the facility is treated as an operating lease. The minimum annual rent on the facility is subject to increases specified in the lease. The Company is also required to pay taxes, insurance and operating costs under the facility lease. The Company recognizes level monthly rent for its facility lease over the entire lease period. The monthly rent is calculated by adding the total rent payments over the entire lease period and then dividing the result by the total term of the lease. The $0.9 million difference between the base rent paid and the rent expensed through December 31, 2015 is recorded as deferred rent in the balance sheet. Rent expense for each of the years ended December 31, 2015, 2014 and 2013 was $2.8 million.

At December 31, 2015, future minimum rental payments due under the Company’s facilities lease were as follows (in thousands):

Year ending December 31,
2016	$	3,602
2017		2,433
2018		—
2019		—
2020		—
Thereafter		—
Total lease payments	$	6,035

Other Contingencies

In late October and early November 2013, following the Company’s announcement of the results of its Phase 3 trial of Allovectin^® and the subsequent decline of the price of the Company’s common stock, two putative securities class action complaints were filed in the U.S. District Court for the Southern District of California against the Company and certain of its current and former officers. On February 26, 2014, the two cases were consolidated into one action and a lead plaintiff and lead counsel were appointed (“Consolidation Order”).  On May 12, 2014, the lead plaintiff filed a first amended consolidated complaint alleging that the defendants violated Section 10(b) and 20(a) of the Securities Exchange Act of 1934 by making materially false and misleading statements regarding our business prospects and the prospects for Allovectin^®, thereby artificially inflating the price of the Company’s common stock.  On June 9, 2014, the defendants filed a motion to dismiss the first amended complaint and a motion to strike certain allegations in the amended complaint.  On March 9, 2015, the Court granted defendants’ motion to dismiss the first amended complaint and terminated as moot defendants’ motion to strike, or Order. The lead plaintiff was granted leave to amend his first amended complaint on or before March 25, 2015. The lead plaintiff chose not to amend his complaint and instead stipulated to an entry of judgment. On April 28, 2015, the Court entered final judgment dismissing the action, or Judgment. On May 28, 2015, the lead plaintiff appealed the Judgment to the U.S. Court of Appeals for the Ninth Circuit. That same day, another group of the Company’s stockholders that had previously moved for appointment as lead plaintiff, or the Vical Investor Group, also appealed the Judgment, as well as the Consolidation Order, to the U.S. Court of Appeals for the Ninth Circuit. On August 3, 2015, the Vical Investor Group voluntarily dismissed its appeal. On October 8, 2015, the lead plaintiff-appellant filed an opening brief in support of his appeal. Defendants filed an answering brief on December 9, 2015. On January 27, 2016, lead plaintiff-appellant filed a motion to dismiss his appeal with prejudice, which was joined by defendants. On February 1, 2016, the Ninth Circuit granted the joint motion and dismissed the appeal.     

In the ordinary course of business, the Company may become a party to additional lawsuits involving various matters. The Company is unaware of any such lawsuits presently pending against it which, individually or in the aggregate, are deemed to be material to the Company’s financial condition or results of operations.

The Company prosecutes its intellectual property vigorously to obtain the broadest valid scope for its patents. Due to uncertainty of the ultimate outcome of these matters, the impact on future operating results or the Company’s financial condition is not subject to reasonable estimates.

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Stockholders' Equity

12 Months Ended

Dec. 31, 2015

Equity [Abstract]

Stockholders' Equity

8. Stockholders’ Equity

As of the date of this filing the Company has on file a shelf registration statement that allows it to raise up to an additional $100.0 million from the sale of common stock, preferred stock, debt securities and/or warrants. Specific terms of any offering under the shelf registration statements and the securities involved would be established at the time of sale.

In March 2015, the Company entered into license and stock purchase agreements with Astellas, granting the Company an exclusive worldwide license to develop and commercialize a novel antifungal, VL-2397, formally known as ASP2397.  VL-2397 is a potential therapeutic for invasive fungal infections, including invasive aspergillosis.  Astellas received 861,216 shares of unregistered Company common stock and $250,000 in cash.  The $250,000 cash payment and the fair value of the common stock issued of $775,094 were included in research and development expenses during the year ended December 31, 2015.

In April 2014, the Company entered into an At-the-Market Issuance Sales Agreement, or ATM Agreement, with Meyers Associates, L.P. (doing business as Brinson Patrick, a division of Meyers Associates, L.P.), or Brinson Patrick, under which the Company could issue and sell up to $25.0 million of shares of its common stock from time to time. During the year ended December 31, 2014, the Company sold 3,291,521 shares under the Sales Agreement and received gross proceeds of $4,067,751. There were no shares sold during the year ended December 31, 2015. This agreement expired in May 2015.

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Stock Based Compensation

12 Months Ended

Dec. 31, 2015

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock Based Compensation

9. Stock Based Compensation

The Company has a stock-based compensation plan which is described below. Total stock-based compensation expense of $1.9 million, $3.2 million and $3.5 million was recognized for the years ended December 31, 2015, 2014 and 2013, respectively. Total stock-based compensation expense was allocated to research and development, manufacturing and production and general and administrative expense as follows (in thousands):

	Year Ended December 31,
	2015		2014		2013
Research and development	$	392	$	785	$	908
Manufacturing and production		159		229		258
General and administrative		1,351		2,145		2,300
Total stock-based compensation expense	$	1,902	$	3,159	$	3,466
Cash received from RSU grants and options exercised	$	3	$	2	$	816

Stock Incentive Plan

The Company has a stock incentive plan, under which 19,700,000 shares of common stock, subject to adjustment as provided in the plan, are reserved for issuance to employees, non-employee directors and consultants of the Company. As of December 31, 2015 there were 16,448,052 shares reserved for future issuance under the plan. The plan provides for the grant of incentive and nonstatutory stock options and the direct award or sale of shares, including restricted stock. The exercise price of stock options must equal at least the fair market value of the underlying common stock on the date of grant. The maximum term of options granted under the plan is ten years. Except for annual grants to non-employee directors which vest at the next annual meeting, options generally vest 25% on the first anniversary of the date of grant, with the balance vesting quarterly over the remaining three years. The plan also limits the number of options that may be granted to any plan participant in a single calendar year to 1,300,000 shares.

The Company has granted RSUs to executive officers, other executives, and employees under the stock incentive plan. In 2015, 2014, and 2013 the Company granted RSUs covering an aggregate of 788,429, 828,000, and 409,189 shares of common stock, respectively. These RSUs generally vest 25% on the first anniversary date of the grant, with the remaining rights vesting quarterly over the remaining three years and, once vested, allow the participants to acquire the underlying shares of common stock at par value. The participants are not entitled to sell or transfer any unvested RSUs and are not entitled to vote or receive dividends on any shares of common stock covered by the RSUs prior to the acquisition of such shares. Granted but unvested RSUs are forfeited at termination of employment. Compensation expense related to the RSUs for the years ended December 31, 2015, 2014, and 2013 was approximately $0.8 million, $1.1 million and $1.0 million, respectively.

The following table summarizes stock option transactions under the Company’s stock incentive plans for the years ended December 31, 2015, 2014 and 2013:

	Shares			WeightedAverage Exercise Price
Outstanding December 31, 2012		7,996,569		$	3.36
Granted		2,876,382		$	2.56
Exercised		(347,450	)	$	2.34
Forfeited		(2,121,313	)	$	3.27
Outstanding December 31, 2013		8,404,188		$	3.15
Granted		1,889,614		$	1.40
Exercised		—		$	—
Forfeited		(1,699,370	)	$	3.69
Outstanding December 31, 2014		8,594,432		$	2.66
Granted		2,356,750		$	1.01
Exercised		—		$	—
Forfeited		(1,495,344	)	$	2.15
Outstanding December 31, 2015		9,455,838		$	2.33
Vested and unvested options expected to vest as of    December 31, 2015		9,235,450		$	2.35

The number of underlying shares and weighted average exercise price of options exercisable at December 31, 2015, 2014 and 2013, were 6,884,679 shares at $2.68, 6,037,169 shares at $2.89, and 5,212,897 shares at $3.49, respectively. The weighted average remaining contractual term of options outstanding and options exercisable at December 31, 2015, was 6.3 years and 5.5 years, respectively. The weighted average remaining contractual term of vested and unvested options expected to vest at December 31, 2015, was 6.3 years. The aggregate intrinsic value of options outstanding and options exercisable at December 31, 2015, was $0.0 million and $0.0 million, respectively. As of December 31, 2015, the total unrecognized compensation cost related to unvested options was $0.8 million, which is expected to be recognized over a weighted-average period of 1.34 years.

The weighted average grant-date fair value of options granted during the years ended December 31, 2015, 2014 and 2013, was $0.51, $0.73 and $1.31 per share, respectively. There were no options exercised during the years ended December 31, 2015 or 2014.  The total intrinsic value of options exercised during the year ended December 31, 2013 was $0.5 million. At December 31, 2015, there were 5,421,917 shares available for grant under the Company’s stock incentive plans.

A summary of the outstanding RSUs as of December 31, 2015, and changes during the year then ended is presented below:

	Shares			WeightedAverage Grant-Date Fair Value per Share
Unvested at December 31, 2014		960,066		$	1.70
Granted		788,429		$	1.04
Vested		(579,677	)	$	1.68
Cancelled		(128,076	)	$	1.37
Unvested at December 31, 2015		1,040,742		$	1.26

The aggregate grant-date fair value of RSUs granted during the years ended December 31, 2015, 2014 and 2013, was $0.8 million, $1.2 million and $1.0 million, respectively. As of December 31, 2015, the total unrecognized compensation cost related to unvested RSUs was $0.5 million, which is expected to be recognized over a weighted average period of 1.35 years. The aggregate grant-date fair value of shares subject to RSUs vested during the years ended December 31, 2015, 2014 and 2013, was $1.0 million, $0.8 million and $1.0 million, respectively. As of December 31, 2015, there were 529,555 shares of common stock underlying RSUs that were fully vested but the issuance of such shares has been deferred.

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Restructuring Costs

12 Months Ended

Dec. 31, 2015

Restructuring And Related Activities [Abstract]

Restructuring Costs

10. Restructuring Costs

In August 2013, the Company announced that its recently completed Phase 3 clinical trial of Allovectin^®, the Company’s investigational cancer immunotherapy, failed to meet the pre-established endpoints. As a result, the Company restructured its operations to conserve capital, which included a staff reduction of 47 employees and the impairment of certain intangible assets. The Company recorded charges for employee termination benefits during the year ended December 31, 2013 of $2.2 million, of which $1.2 million, $0.5 million and $0.5 million is included in research and development, manufacturing and production and general and administrative expenses, respectively. The Company also recorded an asset impairment charge during the year ended December 31, 2013 of $0.7 million, which is included in research and development expenses.

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Income Taxes

12 Months Ended

Dec. 31, 2015

Income Tax Disclosure [Abstract]

Income Taxes

11. Income Taxes

At December 31, 2015, the Company had deferred tax assets of $120.8 million. Due to uncertainties surrounding the Company’s ability to generate future taxable income to realize these assets, a full valuation allowance has been established to offset the net deferred tax asset. Pursuant to Sections 382 and 383 of the Internal Revenue Code, or IRC, annual use of the Company’s net operating loss and credit carryforwards may be limited in the event a cumulative change in ownership of more than 50% occurs within a three-year period. The Company determined that such an ownership change occurred on December 29, 2006, as defined in the provisions of Section 382 of the IRC as a result of various stock issuances used to finance the Company’s operations. Such ownership change resulted in annual limitations on the utilization of tax attributes, including net operating loss carryforwards and tax credits. The Company estimates that $101.2 million of its net operating loss carryforwards were effectively eliminated under Section 382 for federal tax purposes. A portion of the remaining net operating losses limited by Section 382 become available each year. The Company also estimates that $12.2 million of its research and development credits and other tax credits were effectively eliminated under Section 383 for federal purposes. As a result of the Section 382 analysis completed during 2012, the Company has included in the deferred tax asset schedule the deferred tax assets for net operating losses of $83.1 million and tax credits of $19.9 million. The company’s Section 382 analysis was completed through December 31, 2011. There is a risk that additional changes in ownership could have occurred since that date. If a change in ownership were to have occurred, additional net operating loss and tax credit carryforwards could be eliminated or restricted. If eliminated, the related asset would be removed from the deferred tax asset schedule with a corresponding reduction in the valuation allowance.

The Company has historically filed its California income tax returns as doing business only in the state of California.  Accordingly, all of its tax operating losses have been allocated to California.  On December 31, 2015, the California Supreme Court overturned the decision of the California Court of Appeals in Gillette v. FTB.  The California Supreme Court ruling, coupled with administrative guidance from the California Franchise Tax Board, has the effect of requiring California businesses to apportion their losses to California using a single sales factor, based on a market approach.  Accordingly, the Company has preliminarily redetermined its California tax operating losses for 2013 through 2015 as if it were a multistate business subject to the California single sales factor market rules.  Such an analysis has not been completed, and therefore the Company has adjusted its California net operating loss carryforwards and deferred tax assets to the state rate of zero in its financial statement disclosures.  The California tax effect of the Company’s 2013 and 2014 net operating losses is reflected as an increase in unrecognized tax benefits in the table below.

Deferred income taxes result primarily from temporary differences between financial and tax reporting.  Deferred tax assets and liabilities are determined based on the difference between the financial statement bases and the tax bases of assets and liabilities using enacted tax rates.  A valuation allowance is established to reduce deferred tax assets to the amount that is expected more likely than not to be realized.

Significant components of the Company’s deferred tax assets as of December 31, 2015 and 2014 are listed below. A valuation allowance of $120.8 million and $124.9 million at December 31, 2015 and 2014, respectively, has been recognized to offset the net deferred tax assets as realization of such assets is uncertain.

Amounts for the years ended December 31 were as follows (in thousands):

Deferred Tax Assets	2015			2014
Net operating losses	$	83,143		$	85,510
Credit carryovers		19,903			19,903
Depreciation and amortization		13,944			14,922
Accruals and reserves		609			808
Capital loss carryover		85			100
Other		3,114			3,660
Total deferred tax assets		120,798			124,903
Less valuation allowance		(120,798	)		(124,903	)
Net deferred tax assets	$	—		$	—

In November 2015, the FASB issued Accounting Standard Update No. 2015-17, “Balance Sheet Classification of Deferred Taxes”, an update to ASC 740, Income Taxes (“Update”).  Current GAAP requires an entity to separate deferred income tax liabilities and assets into current and noncurrent amounts in a classified statement of financial position.  To simplify the presentation of deferred income taxes, the amendments in this Update require that deferred tax liabilities and assets be classified as noncurrent in a classified statement of financial position.  The current requirement that deferred tax liabilities and assets of a tax-paying component of an entity be offset and presented as a single amount is not affected by the amendments in this Update.

For public business entities, the amendments in this update are effective for financial statements issued for annual periods beginning after December 15, 2016, and interim periods within those annual periods.  The Board also decided to permit earlier application by all entities as of the beginning of any interim or annual reporting period.  The Board further provides that this Update may be applied to all deferred tax liabilities and assets retrospectively to all periods presented.  The Company chose to adopt the Update in fiscal year ended December 31, 2015 and apply this Update on a prospective basis.

The reconciliation between the provision for income taxes and income taxes computed using the U.S. federal statutory corporate tax rate were as follows for the years ended December 31 (in thousands):

	2015			2014			2013
Computed “expected” tax benefit	$	(3,152	)	$	(5,607	)	$	(10,621	)
State income taxes, net of federal benefit		—			(444	)		(1,947	)
Tax effect of:
Change in valuation allowance		(4,069	)		5,102			13,074
Rate change		3,524			—			—
Expiration of prior year credits and net operating    losses		786			675			(237	)
Research and development and other tax credits    carryovers		—			—			(672	)
Stock compensation		376			274			337
Uncertain tax positions		3,074			—			—
Other		(539	)		—			66
Provision for income taxes	$	—		$	—		$	—

As of December 31, 2015 and 2014, the Company had available federal net operating loss carryforwards of approximately $311.3 million and $307.3 million, respectively, which expire from 2018 through 2035. In addition, the Company had federal research and development credit and orphan drug credit carryforwards of $26.3 million and $26.3 million as of December 31, 2015 and 2014, respectively, to reduce future federal income taxes, if any. These carryforwards expire from 2018 through 2033 and are subject to review and possible adjustment by the Internal Revenue Service. The Company also has available California state net operating loss carryforwards of approximately $262.8 million and $275.0 million as of December 31, 2015 and 2014, respectively, which expire from 2016 to 2035. In addition, the Company had California research and development credits of approximately $8.8 million as of December 31, 2015 and 2014 to reduce future California income tax, if any. The California research and development credits do not expire.

The Company generated windfall tax benefits from the settlement of certain stock awards. The tax benefit will be recorded as a credit to additional paid-in capital in the year the deduction reduces income taxes payable. The net operating loss carryforwards related to these windfall tax benefits of approximately $1.6 million are included in the net operating loss carryforwards disclosed above.

The Company recognizes liabilities for uncertain tax positions based on a two-step process.  The first step is to evaluate the tax position for recognition by determining if the weight of available evidence indicates that it is more likely than not that the position will be sustained on audit, including resolution of related appeals or litigation processes, if any.  The second step is to measure the tax benefit as the largest amount that is more than 50% likely of being realized upon settlement.  While the Company believes that it has appropriate support for the positions taken on its tax returns, the Company regularly assesses the potential outcome of examinations by tax authorities in determining the adequacy of its provision for income taxes.

The Company has not completed an analysis of uncertain tax positions related to credits recorded as deferred tax assets.  If such analysis is performed at a later date and an uncertain tax position is identified, the related deferred tax asset would be reduced along with a corresponding reduction in the valuation allowance.

The following table summarizes the activity related to our unrecognized tax benefits (in thousands):

	2015		2014		2013
Beginning balance	$	582	$	—	$	—
Increases related to prior year tax positions		3,758		—		—
Increases related to current year tax positions		—		582		—
Ending balance	$	4,340	$	582	$	—

As of December 31, 2015 and 2014, the Company had gross unrecognized tax benefits of $4.3 million and $0.6 million, respectively, none of which would affect the effective tax rate.  The Company does not anticipate any significant decreases in its unrecognized tax benefits over the next 12 months.  The Company’s policy is to recognize the interest expense and/or penalties related to income tax matters as a component of income tax expense.  The Company had no accrual for interest or penalties on its balance sheets at December 31, 2015 or December 31, 2014, and has not recognized interest and/or penalties in its statements of operations for any of the years ended December 31, 2015, 2014 or 2013.

The Company is subject to taxation in the United States and California. The Company’s tax years for 1997 and forward are subject to examination by the United States and California tax authorities due to the carryforward of unutilized net operating losses and R&D credits.

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Employee Benefit Plan

12 Months Ended

Dec. 31, 2015

Compensation And Retirement Disclosure [Abstract]

Employee Benefit Plan

12. Employee Benefit Plan

The Company has a defined contribution savings plan under section 401(k) of the IRC. The plan covers substantially all employees. The Company matches employee contributions made to the plan according to a specified formula. The Company’s matching contributions totaled approximately $0.1 million, $0.1 million and $0.2 million for the years ended 2015, 2014 and 2013, respectively.

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Summary of (Unaudited) Quarterly Financial Information

12 Months Ended

Dec. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

Summary of (Unaudited) Quarterly Financial Information

13. Summary of (Unaudited) Quarterly Financial Information

The following is a summary of the Company’s (unaudited) quarterly results of operations for the years ended December 31 (in thousands, except per share amounts):

2015:	March 31,			June 30,			Sept. 30,			Dec. 31,
Total revenues	$	4,944		$	4,176		$	5,017		$	6,813
Total operating expenses		8,801			6,968			5,350			9,235
Net loss		(3,821	)		(2,762	)		(300	)		(2,355	)
Basic and diluted net loss per share (1)		(0.04	)		(0.03	)		(0.00	)		(0.03	)

2014:	March 31,			June 30,			Sept. 30,			Dec. 31,
Total revenues	$	2,447		$	4,505		$	3,442		$	4,823
Total operating expenses		5,930			8,570			7,838			9,505
Net income (loss)		(3,455	)		(4,040	)		(4,364	)		(4,633	)
Basic and diluted net loss per share (1)		(0.04	)		(0.05	)		(0.05	)		(0.05	)

(1) Net income (loss) per share is computed independently for each quarter and the full year based upon respective shares outstanding. Therefore, the sum of the quarterly loss per share amounts may not equal the annual amounts reported.

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Organization and Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Organization and Business Activity

Organization and Business Activity

Vical Incorporated, or the Company, a Delaware corporation, was incorporated in April 1987 and has devoted substantially all of its resources since that time to its research and development programs. The Company researches and develops biopharmaceutical products, including those based on its patented DNA delivery technologies for the prevention and treatment of serious or life-threatening diseases.

All of the Company’s potential products are in research and development phases. No revenues have been generated from the sale of any such products, nor are any such revenues expected for at least the next several years. The Company earns revenue from research and development agreements with pharmaceutical collaborators and from contract manufacturing agreements. Most of the Company’s product candidates will require significant additional research and development efforts, including extensive preclinical and clinical testing. All product candidates that advance to clinical testing will require regulatory approval prior to commercial use, and will require significant costs for commercialization. There can be no assurance that the Company’s research and development efforts, or those of its collaborators, will be successful. The Company expects to continue to incur substantial losses and not generate positive cash flows from operations for at least the next several years. No assurance can be given that the Company can generate sufficient product revenue to become profitable or generate positive cash flows from operations.

Basis of Presentation

Basis of Presentation

These financial statements are prepared in conformity with accounting principles generally accepted in the United States of America.

Use of Estimates

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make informed estimates and assumptions that affect the amounts reported in the financial statements and disclosures made in the accompanying notes. Actual results could differ materially from those estimates.

Cash, Cash Equivalents and Marketable Securities

Cash, Cash Equivalents and Marketable Securities

Cash and cash equivalents consist of cash and highly liquid securities with original maturities at the date of acquisition of ninety days or less and can be liquidated without prior notice or penalty. Investments with an original maturity of more than ninety days are considered marketable securities and have been classified by management as available-for-sale. These investments are classified as current assets, even though the stated maturity date may be one year or more beyond the current balance sheet date which reflects management’s intention to use the proceeds from sales of these securities to fund its operations, as necessary. Such investments are carried at fair value, with unrealized gains and losses included as a separate component of stockholders’ equity. Realized gains and losses from the sale of available-for-sale securities or the amounts, net of tax, reclassified out of accumulated other comprehensive income (loss), if any, are determined on a specific identification basis.

Restricted Cash

Restricted Cash

The Company is required to maintain a letter of credit securing an amount equal to twelve months of the current monthly installment of base rent for the term of the lease for its facilities, which ends in August 2017. Under certain circumstances the Company may be able to eliminate the need for the letter of credit. At December 31, 2015 and 2014, restricted cash of $3.2 million  was pledged as collateral for the letter of credit.

Concentrations of Credit Risk

Concentrations of Credit Risk

Financial instruments that potentially subject the Company to significant concentrations of credit risk consist primarily of cash equivalents, marketable securities and receivables. The Company invests its excess cash in debt instruments of financial institutions and of corporations with above average credit ratings, in U.S. government obligations, and in money market funds and certificates of deposits at financial institutions.

Property and Equipment

Property and Equipment

Property and equipment is recorded at cost and depreciation is computed using the straight-line method over the estimated useful lives of the assets. Assets acquired pursuant to capital lease arrangements and leasehold improvements are amortized using the straight-line method over the shorter of the life of the remaining lease term or the remaining useful life of the asset. Manufacturing equipment has estimated useful lives of ten years. All other property and equipment have estimated useful lives of 3 to 5 years. Maintenance and repairs of property and equipment are expensed as incurred.

Intangible Assets

Intangible Assets

Intangible assets include certain costs related to patent applications. The Company capitalizes license fees paid to acquire access to proprietary technology if the technology is expected to have alternative future use in multiple research and development projects. The cost of licensed technology rights is amortized using the straight-line method over the estimated useful life of the technology. Certain costs related to patent applications are amortized over the estimated economic lives of the patents, which is generally 20 years and typically commences at the time the patent application is filed. As of December 31, 2015, the weighted average amortization period of capitalized patent costs is approximately 9 years. Amortization expense for licensed technology and capitalized patent cost is included in research and development expenses.

Impairment of Long-lived Assets

Impairment of Long-lived Assets

The Company reviews long-lived assets for impairment at least annually, quarterly for intangible assets, and whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Should an impairment exist, the impairment loss would be measured based on the excess of the carrying amount of the asset over the asset’s estimated fair value and the loss recognized in current earnings. The Company recognized research and development expense of approximately $0.2 million, $0.4 million and $0.9 million for the years ended December 31, 2015, 2014 and 2013, respectively, related to patents for which the value was deemed to be impaired.  2013 also includes expense relating to licensed technology for which the value was deemed to be impaired.

Revenue Recognition

Revenue Recognition

Revenue is recognized when the four basic criteria of revenue recognition are met: (1) persuasive evidence of an arrangement exists; (2) delivery has occurred or services rendered; (3) the fee is fixed or determinable; and (4) collectability is reasonably assured. Certain of the Company’s revenue is generated through manufacturing contracts and stand-alone license agreements.

The Company has entered into multiple-element arrangements. In order to account for the multiple-element arrangements, the Company identifies the deliverables included within the agreement and evaluates which deliverables represent separate units of accounting. Analyzing the arrangement to identify deliverables requires the use of judgment, and each deliverable may be an obligation to deliver services, a right or license to use an asset, or another performance obligation.

Multiple-element arrangements

Multiple-element arrangements

The Company has entered into multiple-element arrangements. In order to account for the multiple-element arrangements, the Company identifies the deliverables included within the agreement and evaluates which deliverables represent separate units of accounting. Analyzing the arrangement to identify deliverables requires the use of judgment, and each deliverable may be an obligation to deliver services, a right or license to use an asset, or another performance obligation. The delivered item(s) must have value to the customer on a standalone basis and, if the arrangement includes a general right of return relative to the delivered item, delivery or performance of the undelivered item(s) is considered probable and substantially in the Company’s control.

A delivered item is considered a separate unit of accounting when the delivered item has value to the partner on a standalone basis based on the consideration of the relevant facts and circumstances for each arrangement. Factors considered in this determination include the research capabilities of the partner and the availability of research expertise in this field in the general marketplace. Arrangement consideration is allocated at the inception of the agreement to all identified units of accounting based on their relative selling price. The relative selling price for each deliverable is determined using vendor specific objective evidence, or VSOE, of selling price or third-party evidence of selling price if VSOE does not exist. If neither VSOE nor third-party evidence of selling price exists, the Company uses its best estimate of the selling price for the deliverable. The amount of allocable arrangement consideration is limited to amounts that are fixed or determinable. The consideration received is allocated among the separate units of accounting, and the applicable revenue recognition criteria are applied to each of the separate units. Changes in the allocation of the sales price between delivered and undelivered elements can impact revenue recognition but do not change the total revenue recognized under any agreement. If facts and circumstances dictate that the license has standalone value from the undelivered items, which generally include research and development services and the manufacture of drug products, the license is identified as a separate unit of accounting and the amounts allocated to the license are recognized upon the delivery of the license, assuming the other revenue recognition criteria have been met. However, if the amounts allocated to the license through the relative selling price allocation exceed the upfront license fee, the amount recognized upon the delivery of the license is limited to the upfront fee received. If facts and circumstances dictate that the license does not have standalone value, the transaction price, including any upfront license fee payments received, are allocated to the identified separate units of accounting and recognized as those items are delivered.

The terms of the Company’s partnership agreements provide for milestone payments upon achievement of certain regulatory and commercial events. Under the Milestone Method, the Company recognizes consideration that is contingent upon the achievement of a milestone in its entirety as revenue in the period in which the milestone is achieved only if the milestone is substantive in its entirety. A milestone is considered substantive when it meets all of the following three criteria: 1) The consideration is commensurate with either the entity’s performance to achieve the milestone or the enhancement of the value of the delivered item(s) as a result of a specific outcome resulting from the entity’s performance to achieve the milestone, 2) The consideration relates solely to past performance, and 3) The consideration is reasonable relative to all of the deliverables and payment terms within the arrangement. A milestone is defined as an event (i) that can only be achieved based in whole or in part on either the entity’s performance or on the occurrence of a specific outcome resulting from the entity’s performance, (ii) for which there is substantive uncertainty at the date the arrangement is entered into that the event will be achieved and (iii) that would result in additional payments being due to the Company.

Contract Services, Grant and Royalty Revenue

Contract Services, Grant and Royalty Revenue

The Company recognizes revenues from contract services and federal government research grants during the period in which the related expenditures are incurred and related payments for those services are received or collection is reasonably assured. Royalties to be received based on sales of licensed products by the Company’s partners incorporating the Company’s licensed technology are recognized when received.

Accruals for Potential Disallowed Costs on Government Contracts

Accruals for Potential Disallowed Costs on Government Contracts

The Company has contracts with U.S. government agencies under which it bills for direct and indirect costs incurred. These billed costs are subject to audit by government agencies. The Company established accruals of approximately $49,000 at each of December 31, 2015 and 2014 to provide for potential disallowed costs. In the event that the final costs allowed are different from what the Company has estimated, the Company may need to make a change in its estimated accrual, which could also affect its results of operations and cash flow.

Research and Development Costs

Research and Development Costs

Research and development costs are expensed as incurred. Research and development costs include salaries and personnel-related costs, supplies and materials, outside services, costs of conducting preclinical and clinical trials, facilities costs and amortization of intangible assets. The Company accounts for its clinical trial costs by estimating the total cost to treat a patient in each clinical trial, and accruing this total cost for the patient over the estimated treatment period, which corresponds with the period over which the services are performed, beginning when the patient enrolls in the clinical trial. This estimated cost includes payments to the site conducting the trial, and patient-related lab and other costs related to the conduct of the trial. Cost per patient varies based on the type of clinical trial, the site of the clinical trial, the method of administration of the treatment, and the number of treatments that a patient receives. Treatment periods vary depending on the clinical trial. The Company makes revisions to the clinical trial cost estimates in the current period, as clinical trials progress.

Manufacturing and Production Costs

Manufacturing and Production Costs

Manufacturing and production costs include expenses related to manufacturing contracts and expenses for the production of plasmid DNA for use in the Company’s research and development efforts. Manufacturing expenses related to manufacturing contracts are deferred and expensed when the related revenue is recognized. Production expenses related to the Company’s research and development efforts are expensed as incurred.

Net Loss Per Share

Net Loss Per Share

Basic and diluted net loss per share has been computed using the weighted-average number of shares of common stock outstanding during the period. The weighted-average number of shares used to compute diluted loss per share excludes any assumed exercise of stock options, and the assumed issuance of common stock under restricted stock units, or RSUs, as the effect would be antidilutive. Common stock equivalents of 0.3 million, 0.5 million and 0.9 million for the years ended December 31, 2015, 2014 and 2013, respectively, were excluded from the calculation because of their antidilutive effect.

Fair Value of Financial Instruments

Fair Value of Financial Instruments

The carrying amounts of cash, cash equivalents, restricted cash, marketable securities, receivables, accounts payable and accrued expenses at December 31, 2015 and 2014, are considered to approximate fair value because of the short term nature of those items.

Income Taxes

Income Taxes

The impact of an uncertain income tax position on the income tax return must be recognized at the largest amount that is more-likely-than-not to be sustained upon audit by the relevant taxing authority. An uncertain income tax position will not be recognized if it has less than a 50% likelihood of being sustained. There were no unrecognized tax benefits recorded by the Company as of the date of adoption in 2007. There are no unrecognized tax benefits included in the balance sheets that would, if recognized, affect the effective tax rate.

Deferred income taxes result primarily from temporary differences between financial and tax reporting. Deferred tax assets and liabilities are determined based on the difference between the financial statement bases and the tax bases of assets and liabilities using enacted tax rates. A valuation allowance is established to reduce a deferred tax asset to the amount that is expected more likely than not to be realized.

Comprehensive Loss

Comprehensive Loss

Comprehensive loss consists of net loss and certain changes in equity that are excluded from net loss. Comprehensive loss for the years ended December 31, 2015, 2014 and 2013, has been reflected in the accompanying Statements of Comprehensive Loss. Accumulated other comprehensive income (loss), which is included in stockholders’ equity, represents unrealized gains and losses on marketable securities.

Business Segments

Business Segments

The Company operates in one business segment, which is within the United States, and is dedicated to research and development of DNA delivery technology.

Stock-Based Compensation

Stock-Based Compensation

The Company records its compensation expense associated with stock options and other forms of equity compensation based on their fair value at the date of grant using the Black-Scholes-Merton option pricing model. Stock-based compensation includes amortization related to stock option awards based on the estimated grant date fair value. Stock-based compensation expense related to stock options includes an estimate for forfeitures and the portion that is ultimately expected to vest is recognized ratably over the vesting period of the option. In addition, the Company records expense related to RSUs granted based on the fair value of those awards on the grant date. The fair value related to the RSUs is amortized to expense over the vesting term of those awards. Stock-based compensation expense related to RSUs includes an estimate for forfeitures and the portion expected to vest is recognized ratably over the requisite service period. The expected forfeiture rate of all equity based compensation is based on observed historical patterns of the Company’s employees and is estimated to be 8.75%, 8.75% and 11.2% annually for each of the years ended December 31, 2015, 2014 and 2013, respectively .

The fair value of each option award is estimated on the date of grant using the Black-Scholes-Merton valuation model using the assumptions noted in the following table. The expected life of options is based on the Company’s observed historical exercise patterns. The expected volatility of stock options is based upon the historical volatility of the Company’s stock commensurate with the expected life of the option. The risk-free interest rate is based on the implied yield on a U.S. Treasury zero-coupon issue with a remaining term equal to the expected term of the option. The dividend yield reflects that the Company has not paid any cash dividends since inception and does not intend to pay any cash dividends in the foreseeable future.

	Year Ended December 31,
	2015		2014		2013
Assumptions:
Assumed risk-free interest rate		1.34%		1.63%		1.14%
Assumed volatility		68%		73%		72%
Average expected option life	4.5 years		4.5 years		4.5 years
Expected dividend yield		—		—		—

Recent Accounting Pronouncements

Recent Accounting Pronouncements

In July 2013, the FASB issued guidance on the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. The guidance was effective prospectively for fiscal years, and interim periods within those years, beginning after December 15, 2013. The adoption of this standard beginning with the first quarter of 2014 did not have a material impact on the Company’s consolidated financial statements.

In May 2014, the FASB issued guidance that outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. The guidance provides that an entity recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This guidance also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments, and assets recognized from costs incurred to obtain or fulfill a contract. The guidance allows for either full retrospective or modified retrospective adoption and will become effective for the Company in the first quarter of 2017. The Company is evaluating the alternative transition methods and the potential effects of the adoption of this update on its financial statements.

In August 2014, the FASB issued an amendment to the accounting guidance related to the evaluation of an entity to continue as a going concern. The amendment establishes management’s responsibility to evaluate whether there is substantial doubt about an entity’s ability to continue as a going concern in connection with preparing financial statements for each annual and interim reporting period. The amendment also gives guidance to determine whether to disclose information about relevant conditions and events when there is substantial doubt about an entity’s ability to continue as a going concern. The amended guidance is effective prospectively for fiscal years beginning after December 15, 2016. The new guidance will not have an impact on the Company’s financial position, results of operations or cash flows.

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Organization and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Schedule of Assumptions Used to Estimate the Fair Value of Each Option Award

The fair value of each option award is estimated on the date of grant using the Black-Scholes-Merton valuation model using the assumptions noted in the following table.

	Year Ended December 31,
	2015		2014		2013
Assumptions:
Assumed risk-free interest rate		1.34%		1.63%		1.14%
Assumed volatility		68%		73%		72%
Average expected option life	4.5 years		4.5 years		4.5 years
Expected dividend yield		—		—		—

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Short-Term Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2015

Investments Debt And Equity Securities [Abstract]

Summary of Short-Term Marketable Securities

The following is a summary of short-term marketable securities classified as available-for-sale (in thousands):

December 31, 2015	Amortized Cost		Unrealized Gain		Unrealized Loss		Market Value
U.S. treasuries	$	7,027	$	—	$	8	$	7,019
Corporate bonds		1,000		—		—		1,000
Certificates of deposit		15,239		—		—		15,239
	$	23,266	$	—	$	8	$	23,258

December 31, 2014	Amortized Cost		Unrealized Gain		Unrealized Loss		Market Value
U.S. treasuries	$	5,558	$	—	$	1	$	5,557
Government-sponsored enterprise securities		7,499		—		6		7,493
Corporate bonds		2,025		—		5		2,020
Certificates of deposit		8,429		—		—		8,429
	$	23,511	$	—	$	12	$	23,499

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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Summary of Cash Equivalents, Marketable Securities and Long-Term Investments Measured at Fair Value

Cash equivalents, marketable securities and long-term investments measured at fair value are classified in the table below in one of the three categories described above (in thousands):

	Fair Value Measurements
December 31, 2015	Level 1		Level 2		Level 3		Total
Certificates of deposit	$	15,239	$	—	$	—	$	15,239
U.S. treasuries		7,019		—		—		7,019
Corporate bonds		—		1,000		—		1,000
Auction rate securities		—		—		2,052		2,052
	$	22,258	$	1,000	$	2,052	$	25,310

	Fair Value Measurements
December 31, 2014	Level 1		Level 2		Level 3		Total
Certificates of deposit	$	8,674	$	—	$	—	$	8,674
Money market funds		169		—		—		169
U.S. treasuries		5,557		—		—		5,557
Corporate bonds		—		2,020		—		2,020
Government-sponsored enterprise securities		—		7,493		—		7,493
Auction rate securities		—		—		1,971		1,971
	$	14,400	$	9,513	$	1,971	$	25,884

Summary of Activity for Assets Measured at Fair Value Using Significant Unobservable Inputs

Activity for assets measured at fair value using significant unobservable inputs (Level 3) is presented in the table below (in thousands):

Balance at December 31, 2014	$	1,971
Total net realized gains included in earnings		—
Total net unrealized gains included in other    comprehensive income		81
Net transfers in and/out of Level 3		—
Balance at December 31, 2015	$	2,052
Amount of total losses for the period included in net loss    attributable to the change in unrealized gains or losses    relating to assets still held at December 31, 2015	$	—

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Other Balance Sheet Accounts (Tables)

12 Months Ended

Dec. 31, 2015

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Summary of Property and Equipment

Property and equipment consisted of the following at December 31 (in thousands):

	2015			2014
Equipment	$	17,425		$	17,515
Leasehold improvements		8,048			8,048
		25,473			25,563
Less accumulated depreciation and amortization		(23,600	)		(22,924	)
	$	1,873		$	2,639

Summary of Intangible Assets

Intangible assets consisted of the following at December 31 (in thousands):

	2015			2014
Patent application costs		2,252			2,972
Accumulated amortization patent costs		(952	)		(1,312	)
	$	1,300		$	1,660

Summary of Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses consisted of the following at December 31 (in thousands):

	2015		2014
Employee compensation	$	2,220	$	2,471
Clinical trial accruals		102		1,686
Accounts payable		733		227
Deferred rent		496		432
Other accrued liabilities		361		385
	$	3,912	$	5,201

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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2015

Commitments And Contingencies Disclosure [Abstract]

Summary of Future Minimum Rental Payments Due under Company's Facilities Lease

At December 31, 2015, future minimum rental payments due under the Company’s facilities lease were as follows (in thousands):

Year ending December 31,
2016	$	3,602
2017		2,433
2018		—
2019		—
2020		—
Thereafter		—
Total lease payments	$	6,035

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Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Total Stock-Based Compensation Expense

Total stock-based compensation expense was allocated to research and development, manufacturing and production and general and administrative expense as follows (in thousands):

	Year Ended December 31,
	2015		2014		2013
Research and development	$	392	$	785	$	908
Manufacturing and production		159		229		258
General and administrative		1,351		2,145		2,300
Total stock-based compensation expense	$	1,902	$	3,159	$	3,466
Cash received from RSU grants and options exercised	$	3	$	2	$	816

Summary of Stock Option Transactions under Company's Stock Incentive Plans

The following table summarizes stock option transactions under the Company’s stock incentive plans for the years ended December 31, 2015, 2014 and 2013:

	Shares			WeightedAverage Exercise Price
Outstanding December 31, 2012		7,996,569		$	3.36
Granted		2,876,382		$	2.56
Exercised		(347,450	)	$	2.34
Forfeited		(2,121,313	)	$	3.27
Outstanding December 31, 2013		8,404,188		$	3.15
Granted		1,889,614		$	1.40
Exercised		—		$	—
Forfeited		(1,699,370	)	$	3.69
Outstanding December 31, 2014		8,594,432		$	2.66
Granted		2,356,750		$	1.01
Exercised		—		$	—
Forfeited		(1,495,344	)	$	2.15
Outstanding December 31, 2015		9,455,838		$	2.33
Vested and unvested options expected to vest as of    December 31, 2015		9,235,450		$	2.35

Summary of Outstanding RSUs

A summary of the outstanding RSUs as of December 31, 2015, and changes during the year then ended is presented below:

	Shares			WeightedAverage Grant-Date Fair Value per Share
Unvested at December 31, 2014		960,066		$	1.70
Granted		788,429		$	1.04
Vested		(579,677	)	$	1.68
Cancelled		(128,076	)	$	1.37
Unvested at December 31, 2015		1,040,742		$	1.26

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

Income Tax Disclosure [Abstract]

Summary of Deferred Tax Assets

Amounts for the years ended December 31 were as follows (in thousands):

Deferred Tax Assets	2015			2014
Net operating losses	$	83,143		$	85,510
Credit carryovers		19,903			19,903
Depreciation and amortization		13,944			14,922
Accruals and reserves		609			808
Capital loss carryover		85			100
Other		3,114			3,660
Total deferred tax assets		120,798			124,903
Less valuation allowance		(120,798	)		(124,903	)
Net deferred tax assets	$	—		$	—

Reconciliation Between Provision for Income Taxes and Income Taxes

The reconciliation between the provision for income taxes and income taxes computed using the U.S. federal statutory corporate tax rate were as follows for the years ended December 31 (in thousands):

	2015			2014			2013
Computed “expected” tax benefit	$	(3,152	)	$	(5,607	)	$	(10,621	)
State income taxes, net of federal benefit		—			(444	)		(1,947	)
Tax effect of:
Change in valuation allowance		(4,069	)		5,102			13,074
Rate change		3,524			—			—
Expiration of prior year credits and net operating    losses		786			675			(237	)
Research and development and other tax credits    carryovers		—			—			(672	)
Stock compensation		376			274			337
Uncertain tax positions		3,074			—			—
Other		(539	)		—			66
Provision for income taxes	$	—		$	—		$	—

Summary of Activity Related to Unrecognized Tax Benefits

The following table summarizes the activity related to our unrecognized tax benefits (in thousands):

	2015		2014		2013
Beginning balance	$	582	$	—	$	—
Increases related to prior year tax positions		3,758		—		—
Increases related to current year tax positions		—		582		—
Ending balance	$	4,340	$	582	$	—

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Summary of (Unaudited) Quarterly Financial Information (Tables)

12 Months Ended

Dec. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

Summary of Company's (Unaudited) Quarterly Results of Operations

The following is a summary of the Company’s (unaudited) quarterly results of operations for the years ended December 31 (in thousands, except per share amounts):

2015:	March 31,			June 30,			Sept. 30,			Dec. 31,
Total revenues	$	4,944		$	4,176		$	5,017		$	6,813
Total operating expenses		8,801			6,968			5,350			9,235
Net loss		(3,821	)		(2,762	)		(300	)		(2,355	)
Basic and diluted net loss per share (1)		(0.04	)		(0.03	)		(0.00	)		(0.03	)

2014:	March 31,			June 30,			Sept. 30,			Dec. 31,
Total revenues	$	2,447		$	4,505		$	3,442		$	4,823
Total operating expenses		5,930			8,570			7,838			9,505
Net income (loss)		(3,455	)		(4,040	)		(4,364	)		(4,633	)
Basic and diluted net loss per share (1)		(0.04	)		(0.05	)		(0.05	)		(0.05	)

(1) Net income (loss) per share is computed independently for each quarter and the full year based upon respective shares outstanding. Therefore, the sum of the quarterly loss per share amounts may not equal the annual amounts reported.

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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) shares in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) Segment shares	Dec. 31, 2014 USD ($) shares	Dec. 31, 2013 USD ($) shares
Organization and Summary of Significant Accounting Policies [Line Items]
Maximum period for cash and highly liquid securities with original maturities	90 days or less
Minimum period for marketable securities classified as available-for-sale with original maturities	More than 90 days
Amount of letter of credit, description	The Company is required to maintain a letter of credit securing an amount equal to twelve months of the current monthly installment of base rent for the term of the lease for its facilities, which ends in August 2017.
Restricted cash	$ 3,246,000	$ 3,182,000
Weighted average amortization period for capitalized patent costs	9 years
Research and development expense	$ 230,000	350,000	$ 889,000
Accruals for potential disallowed costs on government contracts	$ 49,000	$ 49,000
Common stock equivalents excluded from the calculation of diluted net income per share | shares	0.3	0.5	0.9
Likelihood threshold for recognition of uncertain tax position	50.00%
Unrecognized tax benefits	$ 0
Number of business segment | Segment	1
Expected forfeiture rate of equity based compensation	8.75%	8.75%	11.20%
Patent application costs [Member]
Organization and Summary of Significant Accounting Policies [Line Items]
Estimated economic lives of the patents	20 years
Equipment [Member]
Organization and Summary of Significant Accounting Policies [Line Items]
Estimated useful life of property and equipment	10 years
Minimum [Member] | All other property and equipment [Member]
Organization and Summary of Significant Accounting Policies [Line Items]
Estimated useful life of property and equipment	3 years
Maximum [Member] | All other property and equipment [Member]
Organization and Summary of Significant Accounting Policies [Line Items]
Estimated useful life of property and equipment	5 years

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Organization and Summary of Significant Accounting Policies - Summary of Fair Value of Share-Based Compensation, Stock Options (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Assumed risk-free interest rate	1.34%	1.63%	1.14%
Assumed volatility	68.00%	73.00%	72.00%
Average expected option life	4 years 6 months	4 years 6 months	4 years 6 months
Expected dividend yield	0.00%	0.00%	0.00%

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Short-Term Marketable Securities - Summary of Short-Term Marketable Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 23,266	$ 23,511
Unrealized Gain	0	0
Unrealized Loss	8	12
Market Value	23,258	23,499
U.S. treasuries [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,027	5,558
Unrealized Gain	0	0
Unrealized Loss	8	1
Market Value	7,019	5,557
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,000	2,025
Unrealized Gain	0	0
Unrealized Loss	0	5
Market Value	1,000	2,020
Certificates of deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	15,239	8,429
Unrealized Gain	0	0
Unrealized Loss	0	0
Market Value	$ 15,239	8,429
Government-sponsored enterprise securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		7,499
Unrealized Gain		0
Unrealized Loss		6
Market Value		$ 7,493

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Short-Term Marketable Securities - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Investments Debt And Equity Securities [Abstract]
Available-for-sale securities maturing outside of one year	$ 0
Net realized gains (losses) on sales of available-for-sale securities	0	$ 0	$ 0
Available-for-sale securities in a continuous unrealized loss position more than 12 months	$ 0	$ 0

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Long-Term Investments - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Investments Schedule [Abstract]
Auction rate securities held, at par value	$ 2,500,000
Maturity of long-term investment	2038
Assumed interest rate	1.72%
Estimated redemption period	5 years
Fair value input discount rate	1.00%
Recognized cumulative losses	$ 500,000
Unrealized gains (losses) on auction rate securities	48,000	$ (9,000)	$ (200,000)
Cumulative unrealized gains	200,000
Carrying value of auction rate security	2,052,000	$ 1,971,000
Recognized cumulative losses realized	$ 0

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Fair Value Measurements - Summary of Cash Equivalents, Marketable Securities and Long-Term Investments Measured at Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 25,310	$ 25,884
Certificates of deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	15,239	8,674
U.S. treasuries [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	7,019	5,557
Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	1,000	2,020
Auction rate securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	2,052	1,971
Money market funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value		169
Government-sponsored enterprise securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value		7,493
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	22,258	14,400
Level 1 [Member] | Certificates of deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	15,239	8,674
Level 1 [Member] | U.S. treasuries [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	7,019	5,557
Level 1 [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Level 1 [Member] | Auction rate securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Level 1 [Member] | Money market funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value		169
Level 1 [Member] | Government-sponsored enterprise securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value		0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	1,000	9,513
Level 2 [Member] | Certificates of deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Level 2 [Member] | U.S. treasuries [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Level 2 [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	1,000	2,020
Level 2 [Member] | Auction rate securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Level 2 [Member] | Money market funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value		0
Level 2 [Member] | Government-sponsored enterprise securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value		7,493
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	2,052	1,971
Level 3 [Member] | Certificates of deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Level 3 [Member] | U.S. treasuries [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Level 3 [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Level 3 [Member] | Auction rate securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 2,052	1,971
Level 3 [Member] | Money market funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value		0
Level 3 [Member] | Government-sponsored enterprise securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value		$ 0

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Fair Value Measurements - Summary of Activity for Assets Measured at Fair Value Using Significant Unobservable Inputs (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Fair Value Disclosures [Abstract]
Balance at December 31, 2014	$ 1,971
Total net realized gains included in earnings	0
Total net unrealized gains included in other comprehensive income	81
Net transfers in and/out of Level 3	0
Balance at December 31, 2015	2,052
Amount of total losses for the period included in net loss attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2015	$ 0

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Fair Value Measurements - Additional Information (Detail) - Level 3 [Member] - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total cumulative unrealized losses related to Level3 assets	$ 400,000
Unrealized losses	$ 0	$ 0	$ 0

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Other Balance Sheet Accounts - Summary of Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Total of property and equipment	$ 25,473	$ 25,563
Less accumulated depreciation and amortization	(23,600)	(22,924)
Property and equipment, net	1,873	2,639
Equipment [Member]
Property, Plant and Equipment [Line Items]
Total of property and equipment	17,425	17,515
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Total of property and equipment	$ 8,048	$ 8,048

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Other Balance Sheet Accounts - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Balance Sheet Related Disclosures [Abstract]
Depreciation and amortization of equipment and leasehold improvements	$ 0.9	$ 1.4	$ 1.6
Amortization of licensed technology rights and patent application costs	0.2	$ 0.2	$ 0.4
Estimated annual amortization for these assets in 2016	0.2
Estimated annual amortization for these assets in 2017	0.2
Estimated annual amortization for these assets in 2018	0.1
Estimated annual amortization for these assets in 2019	0.1
Estimated annual amortization for these assets in 2020	0.1
Estimated annual amortization for these assets after 2020	$ 0.6

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Other Balance Sheet Accounts - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Net total of intangible assets	$ 1,300	$ 1,660
Patent application costs [Member]
Finite-Lived Intangible Assets [Line Items]
Total of summary of intangible assets	2,252	2,972
Accumulated amortization	$ (952)	$ (1,312)

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Other Balance Sheet Accounts - Summary of Accounts Payable and Accrued Expenses (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Payables And Accruals [Abstract]
Employee compensation	$ 2,220	$ 2,471
Clinical trial accruals	102	1,686
Accounts payable	733	227
Deferred rent	496	432
Other accrued liabilities	361	385
Total accounts payable and accrued expenses	$ 3,912	$ 5,201

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Significant Contract, License and Royalty Agreements - Additional Information (Detail)	1 Months Ended			12 Months Ended
	Dec. 31, 2015 USD ($)	Mar. 31, 2015 USD ($) shares	Jul. 31, 2011 USD ($) Product	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Apr. 30, 2015 USD ($)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Additional milestone payments related to active in-license agreements	$ 106,100,000			$ 106,100,000
Astellas In-License Agreements [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Restricted stock issued, shares | shares		861,216
Collaborative Arrangement [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue related to drug product delivered				6,000,000	$ 5,500,000	$ 1,200,000
Number of licensed products Astellas agrees to develop | Product			1
Recognized license revenue			$ 25,000,000	1,800,000	1,600,000	700,000
Milestone payment upon finalization of the trial design							$ 10,000,000
Additional cash payments for achievement through commercial launch							$ 95,000,000
Revenue related to contract services delivered				8,700,000	7,800,000	4,400,000
Collaborative Arrangement [Member] | Astellas In-License Agreements [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Restricted stock issued, shares | shares		861,216
Potential future milestone payments		$ 99,000,000
Collaborative Arrangement [Member] | Astellas In-License Agreements [Member] | Research and development [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Cash payment for license agreement		$ 250,000
IPPOX Foundation [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Contractual obligation to manufacture HIV-antigen plasmid DNA								$ 4,100,000
Revenue related to drug product delivered	$ 4,100,000
City of Hope [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
License fees				100,000	100,000	100,000
CytRx [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
License fees				$ 100,000	$ 100,000	300,000
CytRx [Member] | Up-front Payment [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
License fees						$ 3,800,000

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Commitments and Contingencies - Additional Information (Detail) $ in Millions		12 Months Ended
	Nov. 30, 2013 Lawsuit	Dec. 31, 2015 USD ($) ft² Renewal_Options	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Commitments And Contingencies Disclosure [Abstract]
Area for leasing facility of manufacturing, research laboratory and office space | ft²		68,400
Expiry date of lease		Aug. 01, 2017
Number of additional renewals for lease beyond its expiration | Renewal_Options		3
Renewal period for lease for lease beyond its expiration		5 years
Base rent paid and the rent expensed recorded as deferred rent in balance sheet		$ 0.9
Rent expense		$ 2.8	$ 2.8	$ 2.8
Number of putative, securities class action complaints filed in U.S District Court | Lawsuit	2

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Commitments and Contingencies - Summary of Future Minimum Rental Payments Due under Company's Facilities Lease (Detail) $ in Thousands	Dec. 31, 2015 USD ($)
Leases [Abstract]
2016	$ 3,602
2017	2,433
2018	0
2019	0
2020	0
Thereafter	0
Total lease payments	$ 6,035

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Stockholders' Equity - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Apr. 30, 2014
Stockholders Equity [Line Items]
Sale of common stock, preferred stock, debt securities and warrants		$ 100,000,000
Purchase of technology license with common stock		$ 775,000	$ 0	$ 0
Maximum value of common stock issuable under agreement					$ 25,000,000
Number of shares of common stock sold under the sales agreement		0	3,291,521
Gross proceeds from the sales agreement			$ 4,067,751
Sales agreement expiration month and year		2015-05
Astellas In-License Agreements [Member]
Stockholders Equity [Line Items]
Restricted stock issued, shares	861,216
Astellas In-License Agreements [Member] | Collaborative Arrangement [Member]
Stockholders Equity [Line Items]
Restricted stock issued, shares	861,216
Astellas In-License Agreements [Member] | Collaborative Arrangement [Member] | Research and development [Member]
Stockholders Equity [Line Items]
Cash payment for license agreement	$ 250,000
Purchase of technology license with common stock		$ 775,094

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Stock Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	$ 1,902	$ 3,159	$ 3,466
Common stock reserved	19,700,000
Shares reserved for future issuance	16,448,052
Maximum term of options granted	10 years
Number of options to be granted to any one individual	1,300,000
Number of underlying shares exercisable	6,884,679	6,037,169	5,212,897
Weighted average exercise price of options exercisable	$ 2.68	$ 2.89	$ 3.49
Weighted average remaining contractual term of options outstanding	6 years 3 months 18 days
Weighted average remaining contractual term of options exercisable	5 years 6 months
Weighted average remaining contractual term of vested and unvested options expected to vest	6 years 3 months 18 days
Aggregate intrinsic value of options outstanding	$ 0
Aggregate intrinsic value of options exercisable	0
Unrecognized compensation cost related to unvested options	$ 800
Unvested stock-based awards expected to be recognized, weighted-average period	1 year 4 months 2 days
Weighted average grant-date fair value of options granted	$ 0.51	$ 0.73	$ 1.31
Number of options exercised	0	0	347,450
Total intrinsic value of options exercised			$ 500
Shares available for grant	5,421,917
Aggregate grant-date fair value of RSUs vested	$ 1,000	$ 800	1,000
Common stock underlying RSUs that were fully vested	529,555
Restricted stock units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	$ 800	$ 1,100	$ 1,000
Aggregate RSUs granted	788,429	828,000	409,189
Unvested stock-based awards expected to be recognized, weighted-average period	1 year 4 months 6 days
Aggregate grant-date fair value of RSUs granted	$ 800	$ 1,200	$ 1,000
Total unrecognized compensation cost related to unvested RSUs	$ 500
Share-based Compensation Award, Tranche One [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of options vested	25.00%
Share-based Compensation Award, Tranche One [Member] | Restricted stock units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of options vested	25.00%

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Stock Based Compensation - Summary of Total Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$ 1,902	$ 3,159	$ 3,466
Cash received from RSU grants and options exercised	3	2	816
Research and development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	392	785	908
Manufacturing and production [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	159	229	258
General and administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$ 1,351	$ 2,145	$ 2,300

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Stock Based Compensation - Summary of Stock Option Transactions under Company's Stock Incentive Plans (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares Outstanding, Beginning Balance	8,594,432	8,404,188	7,996,569
Shares, Granted	2,356,750	1,889,614	2,876,382
Shares, Exercised	0	0	(347,450)
Shares, Forfeited	(1,495,344)	(1,699,370)	(2,121,313)
Shares Outstanding, Ending Balance	9,455,838	8,594,432	8,404,188
Shares Vested and unvested options expected to vest as of December 31, 2015	9,235,450
Weighted Average Exercise Price, Beginning Balance	$ 2.66	$ 3.15	$ 3.36
Weighted Average Exercise Price, Granted	1.01	1.40	2.56
Weighted Average Exercise Price, Exercised	0	0	2.34
Weighted Average Exercise Price, Forfeited	2.15	3.69	3.27
Weighted Average Exercise Price, Ending Balance	2.33	$ 2.66	$ 3.15
Weighted Average Exercise Price, Vested and unvested options expected to vest as of December 31, 2015	$ 2.35

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Stock Based Compensation - Summary of Outstanding RSUs (Detail) - Restricted stock units (RSUs) [Member] - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares Unvested, Beginning Balance	960,066
Shares, Granted	788,429	828,000	409,189
Shares, Vested	(579,677)
Shares, Cancelled	(128,076)
Shares Unvested, Ending Balance	1,040,742	960,066
Weighted Average Grant-Date Fair Value per Share, Unvested, Beginning Balance	$ 1.70
Weighted Average Grant-Date Fair Value per Share, Granted	1.04
Weighted Average Grant-Date Fair Value per Share, Vested	1.68
Weighted Average Grant-Date Fair Value per Share, Cancelled	1.37
Weighted Average Grant-Date Fair Value per Share, Unvested, Ending Balance	$ 1.26	$ 1.70

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Restructuring Costs - Additional Information (Detail) $ in Millions	1 Months Ended	12 Months Ended
	Aug. 31, 2013 Employee	Dec. 31, 2013 USD ($)
Restructuring Cost and Reserve [Line Items]
Charges for employee termination benefits		$ 2.2
Restructured of employees to conserve capital include a staff reduction of employees | Employee	47
Research and development [Member]
Restructuring Cost and Reserve [Line Items]
Charges for employee termination benefits		1.2
Charges for asset impairments		0.7
Manufacturing and production [Member]
Restructuring Cost and Reserve [Line Items]
Charges for employee termination benefits		0.5
General and administrative [Member]
Restructuring Cost and Reserve [Line Items]
Charges for employee termination benefits		$ 0.5

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Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Loss Carryforwards [Line Items]
Cumulative change in ownership	More than 50% occurs within a three-year period.
Deferred tax assets	$ 120,798,000	$ 124,903,000
Percentage of cumulative change in ownership	50.00%
Deferred tax assets for net operating losses	$ 83,143,000	85,510,000
Tax credits	19,903,000	19,903,000
Accrual for interest or penalties	0	0
Interest or penalties expense	0	0	$ 0
Valuation allowance	120,798,000	124,903,000
Net operating loss carryforwards related to windfall tax benefits	1,600,000
Gross unrecognized tax benefits	$ 4,340,000	582,000	$ 0	$ 0
Tax year open to examination	1997
Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 101,200,000
Research and development credits and other tax credits	12,200,000
Net operating loss carryforwards	311,300,000	307,300,000
Federal research and development credit and orphan drug credit carryforwards	$ 26,300,000	26,300,000
Domestic Tax Authority [Member] | Earliest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, expiration year	2018
Federal research and development credit and orphan drug credit carryforwards, expiration year	2018
Domestic Tax Authority [Member] | Latest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, expiration year	2035
Federal research and development credit and orphan drug credit carryforwards, expiration year	2033
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 262,800,000	275,000,000
Federal research and development credit and orphan drug credit carryforwards	$ 8,800,000	$ 8,800,000
State and Local Jurisdiction [Member] | Earliest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, expiration year	2016
State and Local Jurisdiction [Member] | Latest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, expiration year	2035

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Income Taxes - Summary of Deferred Tax Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Net operating losses	$ 83,143	$ 85,510
Credit carryovers	19,903	19,903
Depreciation and amortization	13,944	14,922
Accruals and reserves	609	808
Capital loss carryover	85	100
Other	3,114	3,660
Total deferred tax assets	120,798	124,903
Less valuation allowance	(120,798)	(124,903)
Net deferred tax assets	$ 0	$ 0

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Income Taxes - Reconciliation Between Provision for Income Taxes and Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Computed “expected” tax benefit	$ (3,152)	$ (5,607)	$ (10,621)
State income taxes, net of federal benefit	0	(444)	(1,947)
Tax effect of:
Change in valuation allowance	(4,069)	5,102	13,074
Rate change	3,524	0	0
Expiration of prior year credits and net operating losses	786	675	(237)
Research and development and other tax credits carryovers	0	0	(672)
Stock compensation	376	274	337
Uncertain tax positions	3,074	0	0
Other	(539)	0	66
Provision for income taxes	$ 0	$ 0	$ 0

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Income Taxes - Summary of Activity Related to Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Beginning balance	$ 582	$ 0	$ 0
Increases related to prior year tax positions	3,758	0	0
Increases related to current year tax positions	0	582	0
Ending balance	$ 4,340	$ 582	$ 0

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Employee Benefit Plan - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Compensation And Retirement Disclosure [Abstract]
Company's contributions towards employee benefit plan	$ 0.1	$ 0.1	$ 0.2

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Summary of (Unaudited) Quarterly Financial Information - Summary of Company's (Unaudited) Quarterly Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Total revenues	$ 6,813	$ 5,017	$ 4,176	$ 4,944	$ 4,823	$ 3,442	$ 4,505	$ 2,447	$ 20,950	$ 15,217	$ 7,718
Total operating expenses	9,235	5,350	6,968	8,801	9,505	7,838	8,570	5,930	30,354	31,843	39,070
Net income (loss)	$ (2,355)	$ (300)	$ (2,762)	$ (3,821)	$ (4,633)	$ (4,364)	$ (4,040)	$ (3,455)	$ (9,238)	$ (16,492)	$ (31,238)
Basic and diluted net loss per share	$ (0.03)	$ 0.00	$ (0.03)	$ (0.04)	$ (0.05)	$ (0.05)	$ (0.05)	$ (0.04)	$ (0.10)	$ (0.19)	$ (0.36)