License and Collaboration Arrangements	9 Months Ended
Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
License and Collaboration Arrangements	4. License and Collaboration Arrangements Out-License Agreements Zai Lab Entasis entered into a license and collaboration agreement with Zai Lab (Shanghai) Co., Ltd. (“Zai Lab”) (Nasdaq: ZLAB), pursuant to which Zai Lab licensed exclusive rights to durlobactam and SUL-DUR, in the Asia-Pacific region (“the Zai Agreement”). Under the terms of the Zai Agreement, Zai Lab will fund most of the registrational clinical trial costs in China for SUL-DUR, with the exception of Phase 3 patient drug supply of licensed products. Zai Lab will conduct development activities and plan and obtain regulatory approval in a specified number of countries in the Asia-Pacific region beyond China after receipt of regulatory approval of a licensed product in China. Zai Lab is also solely responsible for commercializing licensed products in the Asia-Pacific region and will commercialize licensed products for which it has obtained regulatory approval. We are obligated to supply Zai Lab with the licensed products for clinical development and, if the licensed product is approved, for commercial use for a certain period unless Zai Lab notifies otherwise. Zai Lab may take over manufacturing responsibilities for its own commercialization activities within a specified time period following the effective date of the Zai Agreement. We are eligible to receive up to an aggregate of $91.0 million in research and development support payments and development, regulatory and sales milestone payments related to SUL-DUR, imipenem and other combinations with the licensed products. Zai Lab will pay us a tiered royalty equal to from a high-single digit to low-double digit percentage based on annual net sales of licensed products in the territory, subject to specified reductions for the market entry of competing products, loss of patent coverage of licensed products and for payments owed to third parties for additional rights necessary to commercialize licensed products in the territory. Payments received for research support and reimbursable clinical trial costs are recorded as a reduction to research and development expense during the period in which the qualifying expenses are incurred. Such amounts recorded for the three and nine months ended September 30, 2023 and 2022 were not material. Following the approval of XACDURO® by the FDA in May 2023, we recognized $3.0 million in license revenue for the nine months ended September 30, 2023. GARDP Entasis entered into a collaboration agreement with the Global Antibiotic Research and Development Partnership (“GARDP”) for the development, manufacture and commercialization of the product candidate zoliflodacin in certain countries (“the GARDP Collaboration Agreement”). Under the terms of the GARDP Collaboration Agreement, GARDP will use commercially reasonable endeavors to perform and fully fund the Phase 3 registrational trial, including the manufacture and supply of the product candidate containing zoliflodacin, in uncomplicated gonorrhea. We recorded reimbursements from GARDP under this agreement as reduction to research and development expense. Relevant amounts for the three and nine months ended September 30, 2023 and 2022 were not material. In addition, under the GARDP Collaboration Agreement, GARDP was granted a worldwide, fully paid, exclusive and royalty-free license, with the right to sublicense, to use our zoliflodacin technology in connection with GARDP’s development, manufacture and commercialization of zoliflodacin in low-income and specified middle-income countries. We retained commercial rights in all other countries worldwide, including the major markets in North America, Europe and Asia-Pacific. We also retained the right to use and grant licenses to our zoliflodacin technology to perform our obligations under the GARDP Collaboration Agreement and for any purpose other than gonorrhea or community-acquired indications. If we believe that the results of the Phase 3 registrational trial of zoliflodacin would be supportive of an application for marketing approval, we are obligated to use our best efforts to file an application for marketing approval with the FDA within six months of the completion of the trial and to use commercially reasonable endeavors to file an application for marketing approval with the European Medicines Agency (“EMA”). Each party is responsible for using commercially reasonable efforts to obtain marketing authorizations for the product candidate in their respective territories. PAION AG Pursuant to the PAION AG (“PAION”) License, La Jolla granted PAION an exclusive license to commercialize GIAPREZA® and XERAVA® in the European Economic Area, the United Kingdom and Switzerland (collectively, the “PAION Territory”). We are entitled to receive potential commercial milestone payments of up to $109.5 million and double-digit tiered royalty payments. Royalties payable in a given jurisdiction under the PAION License will be subject to reduction on account of generic competition and after patent expiration in that jurisdiction. Pursuant to the PAION License, PAION will be solely responsible for the future development and commercialization of GIAPREZA® and XERAVA® in the PAION Territory. PAION is required to use commercially reasonable efforts to commercialize GIAPREZA® and XERAVA® in the PAION Territory. We have not recognized any revenue from PAION related to commercial milestones from the date of acquisition of La Jolla to September 30, 2023. Royalty revenue recognized under this agreement for the three and nine months ended September 30, 2023 was not material. La Jolla also entered into the PAION commercial supply agreement (the “PAION Supply Agreement”) whereby La Jolla will supply PAION a minimum quantity of GIAPREZA® and XERAVA® through July 13, 2024. The PAION supply agreement will automatically renew until the earlier of July 13, 2027, or until a new supply agreement is executed. During the initial term of the supply agreement, we will be reimbursed for direct and certain indirect manufacturing costs at cost. We recognized $1.0 million in cost reimbursements under this agreement for the three and nine months ended September 30, 2023. Everest Medicines Limited Pursuant to the Everest Medicines Limited (“Everest”) License, La Jolla granted Everest an exclusive license to develop and commercialize XERAVA® for the treatment of complicated intra-abdominal infections (“cIAI”) and other indications in mainland China, Taiwan, Hong Kong, Macau, South Korea, Singapore, the Malaysian Federation, the Kingdom of Thailand, the Republic of Indonesia, the Socialist Republic of Vietnam and the Republic of the Philippines (collectively, the “Everest Territory”). Under the Everest License, we recognized $8.0 million in license revenue for the nine months ended September 30, 2023 as a result of our achievement of a regulatory milestone during the period. We are eligible to receive additional sales milestone payments of up to an aggregate of $20.0 million. We are also entitled to receive tiered royalties from Everest at percentages in the low double digits on sales, if any, in the Everest Territory of products containing eravacycline. Royalties are payable with respect to each jurisdiction in the Everest Territory until the latest to occur of: (i) the last-to-expire of specified patent rights in such jurisdiction in the Everest Territory; (ii) expiration of marketing or regulatory exclusivity in such jurisdiction in the Everest Territory; or (iii) 10 years after the first commercial sale of a product in such jurisdiction in the Everest Territory. Royalty revenue recognized under this agreement for the three and nine months ended September 30, 2023 was not material. La Jolla also entered into the Everest commercial supply agreement (the “Everest Supply Agreement”) whereby La Jolla will supply Everest a minimum quantity of XERAVA® through December 31, 2023 and will transfer to Everest certain XERAVA®-related manufacturing know-how. We will be reimbursed for direct and certain indirect manufacturing costs at 110% of cost through December 31, 2023. We recognized a $0.9 million and $1.6 million in revenue under this agreement for the three and nine months ended September 30, 2023, respectively. In-License Agreements George Washington University Pursuant to the George Washington University (“GW”) License, GW exclusively licensed to La Jolla certain intellectual property rights relating to GIAPREZA®, including the exclusive rights to certain issued patents and patent applications covering GIAPREZA®. Under the GW License, we are obligated to use commercially reasonable efforts to develop, commercialize, market and sell GIAPREZA®. We are obligated to pay a 6% royalty on net sales of GIAPREZA® and 15% on payments received from sublicensees. The obligation to pay royalties under this agreement extends through the last-to-expire patent covering GIAPREZA®. Amounts recognized under this agreement for the three and nine months ended September 30, 2023 were $0.5 million and $1.7 million, respectively. Harvard University Pursuant to the Harvard University (“Harvard”) License, Harvard exclusively licensed to La Jolla certain intellectual property rights relating to tetracycline-based products, including XERAVA®, including the exclusive rights to certain issued patents and patent applications covering such products. Under the Harvard License, we are obligated to use commercially reasonable efforts to develop, commercialize, market and sell tetracycline-based products, including XERAVA®. For each product covered by the Harvard License, we are obligated to make certain payments for the following: (i) up to approximately $15.1 million upon the achievement of certain clinical development and regulatory milestones; (ii) a 5% royalty on direct U.S. net sales of XERAVA®; (iii) a single-digit tiered royalty on direct ex-U.S. net sales of XERAVA®, starting at a minimum royalty rate of 4.5%, with step-ups to a maximum royalty of 7.5% based on the achievement of annual net product sales thresholds; and (iv) 20% on payments received from sublicensees. The obligation to pay royalties under this agreement extends through the last-to-expire patent covering tetracycline-based products, including XERAVA®. For the nine months ended September 30, 2023, we recognized $1.6 million in cost of license revenue under this agreement as a result of the license revenue we earned under the out-licensing agreement with Everest for the same period. Paratek Pharmaceuticals, Inc. Pursuant to the Paratek Pharmaceuticals, Inc. (“Paratek”) License, Paratek non-exclusively licensed to La Jolla certain intellectual property rights relating to XERAVA®, including non-exclusive rights to certain issued patents and patent applications covering XERAVA®. We are obligated to pay Paratek a 2.25% royalty based on direct U.S. net sales of XERAVA®. Our obligation to pay royalties with respect to the licensed product is retroactive to the date of the first commercial sale of XERAVA® and shall continue until there are no longer any valid claims of the Paratek patents, which expires in October 2023. Amounts recognized under this agreement for the three and nine months ended September 30, 2023 were not material.

License and Collaboration Arrangements

9 Months Ended

Sep. 30, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

4. License and Collaboration Arrangements

Out-License Agreements

Zai Lab

Entasis entered into a license and collaboration agreement with Zai Lab (Shanghai) Co., Ltd. (“Zai Lab”) (Nasdaq: ZLAB), pursuant to which Zai Lab licensed exclusive rights to durlobactam and SUL-DUR, in the Asia-Pacific region (“the Zai Agreement”). Under the terms of the Zai Agreement, Zai Lab will fund most of the registrational clinical trial costs in China for SUL-DUR, with the exception of Phase 3 patient drug supply of licensed products. Zai Lab will conduct development activities and plan and obtain regulatory approval in a specified number of countries in the Asia-Pacific region beyond China after receipt of regulatory approval of a licensed product in China. Zai Lab is also solely responsible for commercializing licensed products in the Asia-Pacific region and will commercialize licensed products for which it has obtained regulatory approval. We are obligated to supply Zai Lab with the licensed products for clinical development and, if the licensed product is approved, for commercial use for a certain period unless Zai Lab notifies otherwise. Zai Lab may take over manufacturing responsibilities for its own commercialization activities within a specified time period following the effective date of the Zai Agreement.

We are eligible to receive up to an aggregate of $91.0 million in research and development support payments and development, regulatory and sales milestone payments related to SUL-DUR, imipenem and other combinations with the licensed products. Zai Lab will pay us a tiered royalty equal to from a high-single digit to low-double digit percentage based on annual net sales of licensed products in the territory, subject to specified reductions for the market entry of competing products, loss of patent coverage of licensed products and for payments owed to third parties for additional rights necessary to commercialize licensed products in the territory. Payments received for research support and reimbursable clinical trial costs are recorded as a reduction to research and development expense during the period in which the qualifying expenses are incurred. Such amounts recorded for the three and nine months ended September 30, 2023 and 2022 were not material. Following the approval of XACDURO® by the FDA in May 2023, we recognized $3.0 million in license revenue for the nine months ended September 30, 2023.

GARDP

Entasis entered into a collaboration agreement with the Global Antibiotic Research and Development Partnership (“GARDP”) for the development, manufacture and commercialization of the product candidate zoliflodacin in certain countries (“the GARDP Collaboration Agreement”). Under the terms of the GARDP Collaboration Agreement, GARDP will use commercially reasonable endeavors to perform and fully fund the Phase 3 registrational trial, including the manufacture and supply of the product candidate containing zoliflodacin, in uncomplicated gonorrhea. We recorded reimbursements from GARDP under this agreement as reduction to research and development expense. Relevant amounts for the three and nine months ended September 30, 2023 and 2022 were not material.

In addition, under the GARDP Collaboration Agreement, GARDP was granted a worldwide, fully paid, exclusive and royalty-free license, with the right to sublicense, to use our zoliflodacin technology in connection with GARDP’s development, manufacture and commercialization of zoliflodacin in low-income and specified middle-income countries. We retained commercial rights in all other countries worldwide, including the major markets in North America, Europe and Asia-Pacific. We also retained the right to use and grant licenses to our zoliflodacin technology to perform our obligations under the GARDP Collaboration Agreement and for any purpose other than gonorrhea or community-acquired indications. If we believe that the results of the Phase 3 registrational trial of zoliflodacin would be supportive of an application for marketing approval, we are obligated to use our best efforts to file an application for marketing approval with the FDA within six months of the completion of the trial and to use commercially reasonable endeavors to file an application for marketing approval with the European Medicines Agency (“EMA”). Each party is responsible for using commercially reasonable efforts to obtain marketing authorizations for the product candidate in their respective territories.

PAION AG

Pursuant to the PAION AG (“PAION”) License, La Jolla granted PAION an exclusive license to commercialize GIAPREZA® and XERAVA® in the European Economic Area, the United Kingdom and Switzerland (collectively, the “PAION Territory”). We are entitled to receive potential commercial milestone payments of up to $109.5 million and double-digit tiered royalty payments. Royalties payable in a given jurisdiction under the PAION License will be subject to reduction on account of generic competition and after patent expiration in that jurisdiction. Pursuant to the PAION License, PAION will be solely responsible for the future development and commercialization of GIAPREZA® and XERAVA® in the PAION Territory. PAION is required to use commercially reasonable efforts to commercialize GIAPREZA® and XERAVA® in the PAION Territory. We have not recognized any revenue from PAION related to commercial milestones from the date of acquisition of La Jolla to September 30, 2023. Royalty revenue recognized under this agreement for the three and nine months ended September 30, 2023 was not material.

La Jolla also entered into the PAION commercial supply agreement (the “PAION Supply Agreement”) whereby La Jolla will supply PAION a minimum quantity of GIAPREZA® and XERAVA® through July 13, 2024. The PAION supply agreement will automatically renew until the earlier of July 13, 2027, or until a new supply agreement is executed. During the initial term of the supply agreement, we will be reimbursed for direct and certain indirect manufacturing costs at cost. We recognized $1.0 million in cost reimbursements under this agreement for the three and nine months ended September 30, 2023.

Everest Medicines Limited

Pursuant to the Everest Medicines Limited (“Everest”) License, La Jolla granted Everest an exclusive license to develop and commercialize XERAVA® for the treatment of complicated intra-abdominal infections (“cIAI”) and other indications in mainland China, Taiwan, Hong Kong, Macau, South Korea, Singapore, the Malaysian Federation, the Kingdom of Thailand, the Republic of Indonesia, the Socialist Republic of Vietnam and the Republic of the Philippines (collectively, the “Everest Territory”). Under the Everest License, we recognized $8.0 million in license revenue for the nine months ended September 30, 2023 as a result of our achievement of a regulatory milestone during the period. We are eligible to receive additional sales milestone payments of up to an aggregate of $20.0 million.

We are also entitled to receive tiered royalties from Everest at percentages in the low double digits on sales, if any, in the Everest Territory of products containing eravacycline. Royalties are payable with respect to each jurisdiction in the Everest Territory until the latest to occur of: (i) the last-to-expire of specified patent rights in such jurisdiction in the Everest Territory; (ii) expiration of marketing or regulatory exclusivity in such jurisdiction in the Everest Territory; or (iii) 10 years after the first commercial sale of a product in such jurisdiction in the Everest Territory. Royalty revenue recognized under this agreement for the three and nine months ended September 30, 2023 was not material.

La Jolla also entered into the Everest commercial supply agreement (the “Everest Supply Agreement”) whereby La Jolla will supply Everest a minimum quantity of XERAVA® through December 31, 2023 and will transfer to Everest certain XERAVA®-related manufacturing know-how. We will be reimbursed for direct and certain indirect manufacturing costs at 110% of cost through December 31, 2023. We recognized a $0.9 million and $1.6 million in revenue under this agreement for the three and nine months ended September 30, 2023, respectively.

In-License Agreements

George Washington University

Pursuant to the George Washington University (“GW”) License, GW exclusively licensed to La Jolla certain intellectual property rights relating to GIAPREZA®, including the exclusive rights to certain issued patents and patent applications covering GIAPREZA®. Under the GW License, we are obligated to use commercially reasonable efforts to develop, commercialize, market and sell GIAPREZA®. We are obligated to pay a 6% royalty on net sales of GIAPREZA® and 15% on payments received from sublicensees. The obligation to pay royalties under this agreement extends through the last-to-expire patent covering GIAPREZA®. Amounts recognized under this agreement for the three and nine months ended September 30, 2023 were $0.5 million and $1.7 million, respectively.

Harvard University

Pursuant to the Harvard University (“Harvard”) License, Harvard exclusively licensed to La Jolla certain intellectual property rights relating to tetracycline-based products, including XERAVA®, including the exclusive rights to certain issued patents and patent applications covering such products. Under the Harvard License, we are obligated to use commercially reasonable efforts to develop, commercialize, market and sell tetracycline-based products, including XERAVA®. For each product covered by the Harvard License, we are obligated to make certain payments for the following: (i) up to approximately $15.1 million upon the achievement of certain clinical development and regulatory milestones; (ii) a 5% royalty on direct U.S. net sales of XERAVA®; (iii) a single-digit tiered royalty on direct ex-U.S. net sales of XERAVA®, starting at a minimum royalty rate of 4.5%, with step-ups to a maximum royalty of 7.5% based on the achievement of annual net product sales thresholds; and (iv) 20% on payments received from sublicensees. The obligation to pay royalties under this agreement extends through the last-to-expire patent covering tetracycline-based products, including XERAVA®. For the nine months ended September 30, 2023, we recognized $1.6 million in cost of license revenue under this agreement as a result of the license revenue we earned under the out-licensing agreement with Everest for the same period.

Paratek Pharmaceuticals, Inc.

Pursuant to the Paratek Pharmaceuticals, Inc. (“Paratek”) License, Paratek non-exclusively licensed to La Jolla certain intellectual property rights relating to XERAVA®, including non-exclusive rights to certain issued patents and patent applications covering XERAVA®. We are obligated to pay Paratek a 2.25% royalty based on direct U.S. net sales of XERAVA®. Our obligation to pay royalties with respect to the licensed product is retroactive to the date of the first commercial sale of XERAVA® and shall continue until there are no longer any valid claims of the Paratek patents, which expires in October 2023. Amounts recognized under this agreement for the three and nine months ended September 30, 2023 were not material.