Organization and Nature of Business	6 Months Ended
Jun. 30, 2022
Accounting Policies [Abstract]
Organization and Nature of Business	1. Organization and Nature of Business Silverback Therapeutics, Inc. (“Silverback” or “the Company”) is a biopharmaceutical company focused on leveraging its proprietary ImmunoTAC technology platform to develop systemically delivered and tissue targeted therapeutics for the treatment of chronic viral infections, cancer, and other serious diseases. The Company’s ImmunoTAC platform is the result of a focused effort to discover ways to systemically deliver disease-modifying small molecules in a directed fashion to sites of disease. The Company’s platform enables it to strategically pair proprietary linker-payloads that modulate key disease-modifying pathways with monoclonal antibodies directed at specific disease sites. The Company was formed in Seattle, Washington and incorporated in the state of Delaware on January 4, 2016. On March 28, 2022, the Company’s board of directors approved a corporate restructuring plan to discontinue the Company’s clinical development programs for SBT6050 and SBT6290 and to prioritize resources on the development of the Company’s SBT8230 program and early-stage discovery programs (the “March Restructuring Plan”). In connection with the March Restructuring Plan, the Company’s workforce was reduced by 27%, with substantially all of the reduction in personnel completed by July 15, 2022. The Company initiated the reduction in force on March 31, 2022 and provided severance payments, continuation of group health insurance coverage, and other benefits for a specified period to the affected employees. On July 21, 2022, as amended on August 11, 2022, the Company entered into an Agreement and Plan of Merger and Reorganization (the “Merger Agreement”) with ARS Pharmaceuticals, Inc., a Delaware corporation (“ARS Pharma”), a biopharmaceutical company focused on the development of neffy, a needle-free epinephrine nasal spray, for the emergency treatment of Type I allergic reactions, and Sabre Merger Sub, Inc., a Delaware corporation and wholly owned subsidiary of Silverback (“Merger Sub”). Upon the terms and subject to the satisfaction of the conditions described in the Merger Agreement, Merger Sub will be merged with and into ARS Pharma, with ARS Pharma surviving as a wholly owned subsidiary of Silverback (the “Merger”). The Merger is intended to qualify as a tax-free reorganization for U.S. federal income tax purposes. Risks and Uncertainties The Company is subject to a number of inherent risks which include, but are not limited to, the need to obtain adequate additional funding, possible failure of clinical trials or other events demonstrating a lack of clinical safety or efficacy of its product candidates, dependence on key personnel, reliance on third-party service providers for manufacturing drug product and conducting clinical trials, the ability to successfully secure its proprietary technology, and risks related to the regulatory approval and commercialization of a product candidate. Additionally, the development and commercialization of new drug products is highly competitive. Products or technologies developed by competitors may diminish or render obsolete the Company’s existing products under development. Liquidity and Capital Resources The accompanying financial statements have been prepared assuming that the Company will continue as a going concern. The Company has incurred net operating losses since its inception and had an accumulated deficit of $230.3 million as of June 30, 2022. The Company had cash, cash equivalents, and investments of $282.2 million as of June 30, 2022 and has not generated positive cash flows from operations. To date, the Company has funded its operations primarily through the issuance of redeemable convertible preferred stock, convertible notes, and the sale of common stock in connection with the Company’s initial public offering (“IPO”). The Company’s currently available cash, cash equivalents, and restricted cash as of June 30, 2022 are sufficient to meet its anticipated cash requirements for the 12 months following the date the financial statements are issued. Management considers that there are no conditions or events, in the aggregate, that raise substantial doubt about the entity’s ability to continue as a going concern for a period of at least 12 months from the date the financial statements are issued. Management expects operating losses to continue for the foreseeable future. There can be no assurance that the Company will ever earn revenues or achieve profitability, or if achieved, that they will be sustained on a continuing basis. The Company may be unable to secure financing when needed, or if available, such financings may be under terms that are unfavorable to the Company or the current stockholders. If the Company is unable to raise additional funds when needed, it may be required to delay, reduce the scope of, or eliminate development programs, which may adversely affect its business and operations.

Organization and Nature of Business

6 Months Ended

Jun. 30, 2022

1. Organization and Nature of Business

Silverback Therapeutics, Inc. (“Silverback” or “the Company”) is a biopharmaceutical company focused on leveraging its proprietary ImmunoTAC technology platform to develop systemically delivered and tissue targeted therapeutics for the treatment of chronic viral infections, cancer, and other serious diseases. The Company’s ImmunoTAC platform is the result of a focused effort to discover ways to systemically deliver disease-modifying small molecules in a directed fashion to sites of disease. The Company’s platform enables it to strategically pair proprietary linker-payloads that modulate key disease-modifying pathways with monoclonal antibodies directed at specific disease sites. The Company was formed in Seattle, Washington and incorporated in the state of Delaware on January 4, 2016.

On March 28, 2022, the Company’s board of directors approved a corporate restructuring plan to discontinue the Company’s clinical development programs for SBT6050 and SBT6290 and to prioritize resources on the development of the Company’s SBT8230 program and early-stage discovery programs (the “March Restructuring Plan”). In connection with the March Restructuring Plan, the Company’s workforce was reduced by 27%, with substantially all of the reduction in personnel completed by July 15, 2022. The Company initiated the reduction in force on March 31, 2022 and provided severance payments, continuation of group health insurance coverage, and other benefits for a specified period to the affected employees.

On July 21, 2022, as amended on August 11, 2022, the Company entered into an Agreement and Plan of Merger and Reorganization (the “Merger Agreement”) with ARS Pharmaceuticals, Inc., a Delaware corporation (“ARS Pharma”), a biopharmaceutical company focused on the development of neffy, a needle-free epinephrine nasal spray, for the emergency treatment of Type I allergic reactions, and Sabre Merger Sub, Inc., a Delaware corporation and wholly owned subsidiary of Silverback (“Merger Sub”). Upon the terms and subject to the satisfaction of the conditions described in the Merger Agreement, Merger Sub will be merged with and into ARS Pharma, with ARS Pharma surviving as a wholly owned subsidiary of Silverback (the “Merger”). The Merger is intended to qualify as a tax-free reorganization for U.S. federal income tax purposes.

Risks and Uncertainties

The Company is subject to a number of inherent risks which include, but are not limited to, the need to obtain adequate additional funding, possible failure of clinical trials or other events demonstrating a lack of clinical safety or efficacy of its product candidates, dependence on key personnel, reliance on third-party service providers for manufacturing drug product and conducting clinical trials, the ability to successfully secure its proprietary technology, and risks related to the regulatory approval and commercialization of a product candidate. Additionally, the development and commercialization of new drug products is highly competitive. Products or technologies developed by competitors may diminish or render obsolete the Company’s existing products under development.

Liquidity and Capital Resources

The accompanying financial statements have been prepared assuming that the Company will continue as a going concern. The Company has incurred net operating losses since its inception and had an accumulated deficit of $230.3 million as of June 30, 2022. The Company had cash, cash equivalents, and investments of $282.2 million as of June 30, 2022 and has not generated positive cash flows from operations. To date, the Company has funded its operations primarily through the issuance of redeemable convertible preferred stock, convertible notes, and the sale of common stock in connection with the Company’s initial public offering (“IPO”). The Company’s currently available cash, cash equivalents, and restricted cash as of June 30, 2022 are sufficient to meet its anticipated cash requirements for the 12 months following the date the financial statements are issued. Management considers that there are no conditions or events, in the aggregate, that raise substantial doubt about the entity’s ability to continue as a going concern for a period of at least 12 months from the date the financial statements are issued.

Management expects operating losses to continue for the foreseeable future. There can be no assurance that the Company will ever earn revenues or achieve profitability, or if achieved, that they will be sustained on a continuing basis. The Company may be unable to secure financing when needed, or if available, such financings may be under terms that are unfavorable to the Company or the current stockholders. If the Company is unable to raise additional funds when needed, it may be required to delay, reduce the scope of, or eliminate development programs, which may adversely affect its business and operations.