Company Organization and Nature of Business	3 Months Ended
Mar. 31, 2022
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Company Organization and Nature of Business	1. Company Organization and Nature of Business Vaxcyte, Inc. (“we,” “us,” “the Company,” or “Vaxcyte”), headquartered in San Carlos, California, was incorporated in the state of Delaware on November 27, 2013 as SutroVax, Inc. and we changed our name to Vaxcyte, Inc. on May 15, 2020. We are a clinical-stage vaccine innovation company engineering high-fidelity vaccines to protect humankind from the consequences of bacterial diseases. We are developing broad-spectrum conjugate and novel protein vaccines to prevent or treat bacterial infectious diseases. We are re-engineering the way highly complex vaccines are made through modern synthetic techniques, including advanced chemistry and the XpressCF cell-free protein synthesis platform, exclusively licensed from Sutro Biopharma, Inc. Unlike conventional cell-based approaches, our system for producing difficult-to-make proteins and antigens is intended to accelerate our ability to efficiently create and deliver high-fidelity vaccines with enhanced immunological benefits. Our pipeline includes pneumococcal conjugate vaccine ("PCV") candidates that we believe are among the most broad-spectrum PCV candidates currently in development, targeting the approximately $7 billion global pneumococcal vaccine market. Our lead vaccine candidate, VAX-24, is a 24-valent broad-spectrum investigational PCV being developed for the prevention of invasive pneumococcal disease ("IPD") and pneumonia. On January 6, 2022, we announced that the U.S. Food and Drug Administration ("FDA"), cleared our investigational new drug ("IND") application for VAX-24 in adults. On February 23, 2022, we announced the initiation of our Phase 1/2 clinical proof-of-concept study in adults 18 to 64 years of age. The Phase 1 portion of the study includes 64 healthy adults 18 to 49 years of age and the Phase 2 portion of the study includes approximately 800 healthy adults 50 to 64 years of age. On April 4, 2022, we announced the initiation of the Phase 2 portion of this study in adults 50 to 64 years of age. The initiation of the Phase 2 portion of the study occurred after an independent Data Monitoring Committee completed a prespecified review of Phase 1 safety and tolerability data and recommended that the study progress as planned. We expect to announce topline safety, tolerability and immunogenicity results from the Phase 1 and Phase 2 portions of this study by the end of 2022. Based on the successful completion of the Phase 1 portion of this study, we expect to begin enrollment in a separate Phase 2 study in healthy adults aged 65 and older and to announce topline safety, tolerability and immunogenicity results from this study in the first half of 2023. Subject to a pre-IND meeting with the FDA and the successful topline results of the Phase 1/2 proof-of-concept study in adults 18 to 64 years of age, we anticipate submitting a pediatric IND application to the FDA for VAX-24 in the first half of 2023. Our second PCV candidate, VAX-XP, leverages our scalable and modular platform and builds on the technical proof of concept established by VAX-24 and is designed to expand the breadth of coverage to greater than 30 strains without compromising immunogenicity due to carrier suppression. In addition to our PCV franchise, our pipeline includes VAX-A1, a novel conjugate vaccine candidate designed to prevent Group A Strep; VAX-PG, a novel protein vaccine candidate targeting the keystone pathogen responsible for periodontitis; and other discovery-stage programs. Our primary activities since incorporation have been to perform research and development, undertake preclinical studies and conduct manufacturing activities in support of our product development efforts; organize and staff the Company; establish our intellectual property portfolio; and raise capital to support and expand such activities. Follow-on Offering In January 2022, we completed an underwritten public offering in which we issued 2,500,000 shares of our common stock at a price of $20.00 per share, and pre-funded warrants to purchase 2,500,000 shares of our common stock at a price of $19.999 per underlying share. In February 2022, the underwriters exercised their option to purchase an additional 750,000 shares of common stock. In aggregate, we received approximately $107.6 million in net proceeds after deducting underwriting discounts and commissions and other offering expenses payable by us.

Company Organization and Nature of Business

3 Months Ended

Mar. 31, 2022

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Company Organization and Nature of Business

1. Company Organization and Nature of Business

Vaxcyte, Inc. (“we,” “us,” “the Company,” or “Vaxcyte”), headquartered in San Carlos, California, was incorporated in the state of Delaware on November 27, 2013 as SutroVax, Inc. and we changed our name to Vaxcyte, Inc. on May 15, 2020. We are a clinical-stage vaccine innovation company engineering high-fidelity vaccines to protect humankind from the consequences of bacterial diseases. We are developing broad-spectrum conjugate and novel protein vaccines to prevent or treat bacterial infectious diseases. We are re-engineering the way highly complex vaccines are made through modern synthetic techniques, including advanced chemistry and the XpressCF cell-free protein synthesis platform, exclusively licensed from Sutro Biopharma, Inc. Unlike conventional cell-based approaches, our system for producing difficult-to-make proteins and antigens is intended to accelerate our ability to efficiently create and deliver high-fidelity vaccines with enhanced immunological benefits. Our pipeline includes pneumococcal conjugate vaccine ("PCV") candidates that we believe are among the most broad-spectrum PCV candidates currently in development, targeting the approximately $7 billion global pneumococcal vaccine market. Our lead vaccine candidate, VAX-24, is a 24-valent broad-spectrum investigational PCV being developed for the prevention of invasive pneumococcal disease ("IPD") and pneumonia. On January 6, 2022, we announced that the U.S. Food and Drug Administration ("FDA"), cleared our investigational new drug ("IND") application for VAX-24 in adults. On February 23, 2022, we announced the initiation of our Phase 1/2 clinical proof-of-concept study in adults 18 to 64 years of age. The Phase 1 portion of the study includes 64 healthy adults 18 to 49 years of age and the Phase 2 portion of the study includes approximately 800 healthy adults 50 to 64 years of age. On April 4, 2022, we announced the initiation of the Phase 2 portion of this study in adults 50 to 64 years of age. The initiation of the Phase 2 portion of the study occurred after an independent Data Monitoring Committee completed a prespecified review of Phase 1 safety and tolerability data and recommended that the study progress as planned. We expect to announce topline safety, tolerability and immunogenicity results from the Phase 1 and Phase 2 portions of this study by the end of 2022. Based on the successful completion of the Phase 1 portion of this study, we expect to begin enrollment in a separate Phase 2 study in healthy adults aged 65 and older and to announce topline safety, tolerability and immunogenicity results from this study in the first half of 2023. Subject to a pre-IND meeting with the FDA and the successful topline results of the Phase 1/2 proof-of-concept study in adults 18 to 64 years of age, we anticipate submitting a pediatric IND application to the FDA for VAX-24 in the first half of 2023. Our second PCV candidate, VAX-XP, leverages our scalable and modular platform and builds on the technical proof of concept established by VAX-24 and is designed to expand the breadth of coverage to greater than 30 strains without compromising immunogenicity due to carrier suppression. In addition to our PCV franchise, our pipeline includes VAX-A1, a novel conjugate vaccine candidate designed to prevent Group A Strep; VAX-PG, a novel protein vaccine candidate targeting the keystone pathogen responsible for periodontitis; and other discovery-stage programs. Our primary activities since incorporation have been to perform research and development, undertake preclinical studies and conduct manufacturing activities in support of our product development efforts; organize and staff the Company; establish our intellectual property portfolio; and raise capital to support and expand such activities.

Follow-on Offering

In January 2022, we completed an underwritten public offering in which we issued 2,500,000 shares of our common stock at a price of $20.00 per share, and pre-funded warrants to purchase 2,500,000 shares of our common stock at a price of $19.999 per underlying share. In February 2022, the underwriters exercised their option to purchase an additional 750,000 shares of common stock. In aggregate, we received approximately $107.6 million in net proceeds after deducting underwriting discounts and commissions and other offering expenses payable by us.