Company and Nature of Business	12 Months Ended
Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Company and Nature of Business	1. COMPANY AND NATURE OF BUSINESS Description of Business Athenex, Inc. (the “Company” or “Athenex”), originally under the name Kinex Pharmaceuticals LLC (“Kinex”), formed in November 2003, commenced operations on February 5, 2004, and operated as a limited liability company until it was incorporated in the State of Delaware under the name Kinex Pharmaceuticals, Inc. on December 31, 2012. The Company changed its name to Athenex, Inc. on August 26, 2015. Athenex is a biopharmaceutical company dedicated to becoming a leader in the discovery, development, and commercialization of next generation drugs for the treatment of cancer. The Company’s mission is to improve the lives of cancer patients by creating more effective, safer and tolerable treatments. The Company has assembled a strong and experienced leadership team and has established operations across the pharmaceutical value chain to execute its goal of becoming a leader in bringing innovative cancer treatments to the market and improving health outcomes. The Company is organized around three operating segments: (1) its Oncology Innovation Platform, dedicated to the research and development of our proprietary drugs; (2) its Commercial Platform, focused on the sales and marketing of our specialty drugs and the market development of proprietary drugs; and (3) its Global Supply Chain Platform, dedicated to providing a stable and efficient supply of APIs for clinical and commercial efforts. The Company’s current clinical pipeline in the Oncology Innovation Platform is derived from the following core technologies: (1) Cell Therapy, (2) Orascovery, based on a P-glycoprotein (“P-gp”) pump inhibitor, and (3) Src Kinase inhibition. The Company is primarily engaged in conducting research and development activities through corporate collaborators, in-licensing and out-licensing pharmaceutical compounds and technology, conducting preclinical and clinical testing, identifying and evaluating additional drug candidates for potential in-licensing or acquisition, and raising capital to support development and commercialization activities. The Company also conducts commercial sales of specialty products through its wholly owned subsidiary, Athenex Pharmaceutical Division (“APD”), and 503B products through its wholly owned subsidiary, Athenex Pharma Solutions (“APS”). Going Concern These consolidated financial statements have been prepared in accordance with generally accepted accounting principles applicable to a going concern, which contemplates the realization of assets and the satisfaction of liabilities in the normal course of business. The Company has incurred operating losses since its inception and, as a result, as of December 31, 2021 and 2020 had an accumulated deficit of $913.4 million and $713.6 million, respectively. As of December 31, 2021, the Company had cash and cash equivalents of $35.2 million, restricted cash of $16.5 million, and short-term investments of $10.2 million. The Company projects insufficient liquidity to fund its operations through the next twelve months beyond the date of the issuance of these consolidated financial statements. This condition raises substantial doubt about the Company’s ability to continue as a going concern. Additionally, the Company has financial covenants associated with its Senior Credit Agreement with Oaktree that are measured each quarter. The Company is in compliance with such financial covenants as of December 31, 2021. However, the Company is forecasting that it will be in violation of both the minimum liquidity and revenue covenant included within the Senior Credit Agreement during the twelve month period subsequent to the date of this filing. Pursuant to ASC 205-40-50, the Company’s forecast does not reflect management’s plans that are outside of the Company’s control as described below. Violation of any covenant under the Credit Agreement provides the lenders with the option to accelerate the maturity of the Credit Facility, which carried an outstanding balance of $150.0 million as of December 31, 2021. Should the lenders accelerate the maturity of the Credit Facility, the Company would not have sufficient cash on hand or available liquidity to repay the outstanding debt in the event of default. These conditions and events raise substantial doubt about the Company’s ability to continue as a going concern. In response to these conditions, management’s plans include seeking additional funding through planned product launches, raising capital, including leveraging the existing sales agreement with SVB Leerink (described below), asset monetization and/or seeking funding through alternative means. There can be no assurances, however, that additional funding will be available on favorable terms, or at all. Because management’s plans have not yet been finalized and are not within the Company’s control, such plans cannot be considered probable of being achieved. As a result, the Company has concluded that management’s plans do not alleviate substantial doubt about the Company’s ability to continue as a going concern. These consolidated financial statements do not include any adjustments relating to the recoverability and classification of recorded asset amounts or the amounts and classification of liabilities that might result from the outcome of this uncertainty. Other Significant Risks and Uncertainties In February 2021, the Company received a Complete Response Letter (“CRL”) from the U.S. Food and Drug Administration (“FDA”) regarding the Company’s New Drug Application (“NDA”) for oral paclitaxel and encequidar (“Oral Paclitaxel”) for the treatment of metastatic breast cancer (“mBC”). The FDA issues a CRL to indicate that the review cycle for an application is complete and that the application is not ready for approval in its present form. In the CRL, the FDA indicated its concern of safety risk to patients in terms of an increase in neutropenia-related sequelae on the Oral Paclitaxel arm compared with the IV paclitaxel arm in the Phase III study. The FDA also expressed concerns regarding the uncertainty over the results of the primary endpoint of objective response rate (ORR) at week 19 conducted by blinded independent central review (“BICR”). The FDA stated that the BICR reconciliation and re-read process may have introduced unmeasured bias and influence on the BICR. The FDA recommended that Athenex conduct a new adequate and well-conducted clinical trial in a patient population with mBC representative of the population in the U.S. The FDA determined that adequate risk mitigation strategies to improve toxicity, which may involve dose optimization as well as, or in addition to, exclusion of patients deemed to be at higher risk of toxicity, would be required in any new clinical trial of Oral Paclitaxel. During the second quarter of 2021, the Company held a Type A meeting with the FDA. At the meeting, the Company provided additional analyses, including overall survival (OS) data on patient subgroups, to provide a more comprehensive summary of the risk/benefit assessment. The Company also proposed to collect additional OS data that could inform the design of a new clinical study. In October 2021, the Company held another Type A meeting with the FDA, and the purpose of the meeting was to review with the FDA a proposed design for a new clinical trial intended to address the deficiencies raised in the CRL and discuss the potential regulatory path forward for Oral Paclitaxel in mBC in the U.S. After careful consideration of the feedback provided by the FDA, the Company decided that it will not currently be pursuing regulatory approval for Oral Paclitaxel monotherapy for the treatment of mBC in the U.S. and determined to redeploy its resources to focus on other ongoing studies of Oral Paclitaxel and its cell therapy platform. The Company is subject to a number of risks similar to other biopharmaceutical companies, including, but not limited to, the lack of available capital; possible failure of preclinical testing or clinical trials; inability to obtain regulatory approval of product candidates; competitors developing new technological innovations; potential interruptions in the manufacturing and commercial supply operations; unsuccessful commercialization strategy and launch plans for its proprietary drug candidates; risks inherent in litigation, including purported class actions; market acceptance of the Company’s products; and protection of proprietary technology. If the Company or its partners do not successfully commercialize any of the Company’s product candidates, it will be unable to generate sufficient revenue and might not, if ever, achieve profitability and positive cash flow. If the Company or its partners experience significant disruptions from macroeconomic factors, it could have a material adverse impact on the Company's operations and financial condition and results. Recent Financing Activity At-the-market offering On August 20, 2021, the Company entered into a sales agreement (the “Sales Agreement”) with SVB Leerink LLC, in connection with the offer and sale of up to $100,000,000 of shares of the Company’s common stock, par value $0.001 per share (“ATM Shares”). The ATM Shares to be offered and sold under the Sales Agreement will be issued and sold pursuant to a registration statement on Form S-3 (File No. 333-258185) that became effective on August 12, 2021. During the year ended December 31, 2021, we sold 762,825 shares of our common stock for an average price of $1.49 per share under the Sales Agreement. Senior Secured Loan Agreement and Detachable Warrants On June 19, 2020, the Company entered into a senior secured loan agreement and related security agreements (the “Senior Credit Agreement”) with Oaktree Fund Administration, LLC as administrative agent, and the lenders party thereto (collectively “Oaktree”) to borrow up to $225.0 million in five tranches with a maturity date of June 19, 2026, bearing interest at a fixed annual rate of 11.0%. The first tranche of $100.0 million was drawn by the Company prior to June 30, 2020, with the proceeds used in part to repay in full the outstanding loan and fees under the credit agreement with Perceptive Advisors LLC and its affiliates (“Perceptive”), which resulted in a loss on extinguishment of debt of $7.2 million. The second tranche of $25.0 million was drawn by the Company prior to September 30, 2020 and the third tranche of $25.0 million was drawn by the Company prior to December 31, 2020. The additional debt tranches amounting to an aggregate of $75.0 million were subject to the approval Oral Paclitaxel in the treatment of mBC, and therefore, became unavailable to the Company when it decided to no longer pursue regulatory approval in the U.S. The Company is required to make quarterly interest-only payments until June 19, 2022, after which the Company is required to make quarterly amortizing payments, with the remaining balance of the principal plus accrued and unpaid interest due at maturity. The loan agreement contains specified financial maintenance covenants. The Company was in compliance with such covenants as of December 31, 2021. In connection with the Senior Credit Agreement, the Company granted warrants to Oaktree to purchase an aggregate of up to 908,393 shares of the Company’s common stock at a purchase price of $12.63 per share. This transaction was accounted for as a detachable warrant at its fair value, using the relative fair value method, which is based on a number of unobservable inputs, and is recorded as an increase to additional paid-in-capital on the consolidated statement of stockholders’ equity. The fair value of the warrants was reflected as a discount to the term loan and amortized over the life of the term loan. On January 19, 2022, the Company entered into an amendment to the Senior Credit Agreement with Oaktree (the “Amendment”). The Amendment also amended the warrants held by Oaktree that were issued on June 19, 2020 and August 4, 2020. The Amendment became effective on February 14, 2022, upon the closing of the Company’s sale of its leasehold interest in the manufacturing facility in Dunkirk, New York and certain other related assets (the “Dunkirk Transaction,” see Note 4 - Discontinued Operations). The Amendment provides that the Company make mandatory prepayment of principal to Oaktree equal to 62.5% of the cash proceeds of the Dunkirk Transaction. The Company was also required to pay (i) accrued and unpaid interest and (ii) a 7.0% fee, allocated as a 2.0% Exit Fee and a 5.0% Prepayment Fee (each as defined in the Senior Credit Agreement), on the principal amount being repaid. The Company was required to pay Oaktree an amendment fee of $0.3 million and certain related expenses upon the closing of the Dunkirk Transaction. The Amendment requires the Company to make an additional mandatory prepayment of $12.5 million in principal plus the costs and fees described above by June 14, 2022, within 120 days of the closing of the Dunkirk Transaction. Consistent with the Company’s decision to not pursue regulatory approval for Oral Paclitaxel monotherapy for the treatment of mBC in the United States, the Amendment reduced to zero the amount of the last two tranches of borrowing that had been available under the Senior Credit Agreement upon the achievement of commercial milestones. The warrants were amended to change the exercise price to be paid per share upon exercise of the warrants. The original exercise price of the warrants was $12.63 per share. The Amendment provides that the exercise price for 50% of the shares underlying the warrants will be $1.10 per share. The Dunkirk Transaction closed on February 14, 2021. The Company received proceeds of $40.0 million and used these proceeds to repay $27.4 million of the Senior Credit Agreement with Oaktree according to the terms of the Amendment.

Athenex, Inc. (the “Company” or “Athenex”), originally under the name Kinex Pharmaceuticals LLC (“Kinex”), formed in November 2003, commenced operations on February 5, 2004, and operated as a limited liability company until it was incorporated in the State of Delaware under the name Kinex Pharmaceuticals, Inc. on December 31, 2012. The Company changed its name to Athenex, Inc. on August 26, 2015.

Athenex is a biopharmaceutical company dedicated to becoming a leader in the discovery, development, and commercialization of next generation drugs for the treatment of cancer. The Company’s mission is to improve the lives of cancer patients by creating more effective, safer and tolerable treatments. The Company has assembled a strong and experienced leadership team and has established operations across the pharmaceutical value chain to execute its goal of becoming a leader in bringing innovative cancer treatments to the market and improving health outcomes.

The Company is organized around three operating segments: (1) its Oncology Innovation Platform, dedicated to the research and development of our proprietary drugs; (2) its Commercial Platform, focused on the sales and marketing of our specialty drugs and the market development of proprietary drugs; and (3) its Global Supply Chain Platform, dedicated to providing a stable and efficient supply of APIs for clinical and commercial efforts. The Company’s current clinical pipeline in the Oncology Innovation Platform is derived from the following core technologies: (1) Cell Therapy, (2) Orascovery, based on a P-glycoprotein (“P-gp”) pump inhibitor, and (3) Src Kinase inhibition.

The Company is primarily engaged in conducting research and development activities through corporate collaborators, in-licensing and out-licensing pharmaceutical compounds and technology, conducting preclinical and clinical testing, identifying and evaluating additional drug candidates for potential in-licensing or acquisition, and raising capital to support development and commercialization activities. The Company also conducts commercial sales of specialty products through its wholly owned subsidiary, Athenex Pharmaceutical Division (“APD”), and 503B products through its wholly owned subsidiary, Athenex Pharma Solutions (“APS”).

These consolidated financial statements have been prepared in accordance with generally accepted accounting principles applicable to a going concern, which contemplates the realization of assets and the satisfaction of liabilities in the normal course of business.

The Company has incurred operating losses since its inception and, as a result, as of December 31, 2021 and 2020 had an accumulated deficit of $913.4 million and $713.6 million, respectively. As of December 31, 2021, the Company had cash and cash equivalents of $35.2 million, restricted cash of $16.5 million, and short-term investments of $10.2 million. The Company projects insufficient liquidity to fund its operations through the next twelve months beyond the date of the issuance of these consolidated financial statements. This condition raises substantial doubt about the Company’s ability to continue as a going concern.

Additionally, the Company has financial covenants associated with its Senior Credit Agreement with Oaktree that are measured each quarter. The Company is in compliance with such financial covenants as of December 31, 2021. However, the Company is forecasting that it will be in violation of both the minimum liquidity and revenue covenant included within the Senior Credit Agreement during the twelve month period subsequent to the date of this filing. Pursuant to ASC 205-40-50, the Company’s forecast does not reflect management’s plans that are outside of the Company’s control as described below. Violation of any covenant under the Credit Agreement provides the lenders with the option to accelerate the maturity of the Credit Facility, which carried an outstanding balance of $150.0 million as of December 31, 2021. Should the lenders accelerate the maturity of the Credit Facility, the Company would not have sufficient cash on hand or available liquidity to repay the outstanding debt in the event of default. These conditions and events raise substantial doubt about the Company’s ability to continue as a going concern.

In response to these conditions, management’s plans include seeking additional funding through planned product launches, raising capital, including leveraging the existing sales agreement with SVB Leerink (described below), asset monetization and/or seeking funding through alternative means. There can be no assurances, however, that additional funding will be available on favorable terms, or at all. Because management’s plans have not yet been finalized and are not within the Company’s control, such plans cannot be considered probable of being achieved. As a result, the Company has concluded that management’s plans do not alleviate substantial doubt about the Company’s ability to continue as a going concern.

These consolidated financial statements do not include any adjustments relating to the recoverability and classification of recorded asset amounts or the amounts and classification of liabilities that might result from the outcome of this uncertainty.

In February 2021, the Company received a Complete Response Letter (“CRL”) from the U.S. Food and Drug Administration (“FDA”) regarding the Company’s New Drug Application (“NDA”) for oral paclitaxel and encequidar (“Oral Paclitaxel”) for the treatment of metastatic breast cancer (“mBC”). The FDA issues a CRL to indicate that the review cycle for an application is complete and that the application is not ready for approval in its present form. In the CRL, the FDA indicated its concern of safety risk to patients in terms of an increase in neutropenia-related sequelae on the Oral Paclitaxel arm compared with the IV paclitaxel arm in the Phase III study. The FDA also expressed concerns regarding the uncertainty over the results of the primary endpoint of objective response rate (ORR) at week 19 conducted by blinded independent central review (“BICR”). The FDA stated that the BICR reconciliation and re-read process may have introduced unmeasured bias and influence on the BICR. The FDA recommended that Athenex conduct a new adequate and well-conducted clinical trial in a patient population with mBC representative of the population in the U.S. The FDA determined that adequate risk mitigation strategies to improve toxicity, which may involve dose optimization as well as, or in addition to, exclusion of patients deemed to be at higher risk of toxicity, would be required in any new clinical trial of Oral Paclitaxel. During the second quarter of 2021, the Company held a Type A meeting with the FDA. At the meeting, the Company provided additional analyses, including overall survival (OS) data on patient subgroups, to provide a more comprehensive summary of the risk/benefit assessment. The Company also proposed to collect additional OS data that could inform the design of a new clinical study. In October 2021, the Company held another Type A meeting with the FDA, and the purpose of the meeting was to review with the FDA a proposed design for a new clinical trial intended to address the deficiencies raised in the CRL and discuss the potential regulatory path forward for Oral Paclitaxel in mBC in the U.S. After careful consideration of the feedback provided by the FDA, the Company decided that it will not currently be pursuing regulatory approval for Oral Paclitaxel monotherapy for the treatment of mBC in the U.S. and determined to redeploy its resources to focus on other ongoing studies of Oral Paclitaxel and its cell therapy platform.

The Company is subject to a number of risks similar to other biopharmaceutical companies, including, but not limited to, the lack of available capital; possible failure of preclinical testing or clinical trials; inability to obtain regulatory approval of product candidates; competitors developing new technological innovations; potential interruptions in the manufacturing and commercial supply operations; unsuccessful commercialization strategy and launch plans for its proprietary drug candidates; risks inherent in litigation, including purported class actions; market acceptance of the Company’s products; and protection of proprietary technology. If the Company or its partners do not successfully commercialize any of the Company’s product candidates, it will be unable to generate sufficient revenue and might not, if ever, achieve profitability and positive cash flow. If the Company or its partners experience significant disruptions from macroeconomic factors, it could have a material adverse impact on the Company's operations and financial condition and results.

On August 20, 2021, the Company entered into a sales agreement (the “Sales Agreement”) with SVB Leerink LLC, in connection with the offer and sale of up to $100,000,000 of shares of the Company’s common stock, par value $0.001 per share (“ATM Shares”). The ATM Shares to be offered and sold under the Sales Agreement will be issued and sold pursuant to a registration statement on Form S-3 (File No. 333-258185) that became effective on August 12, 2021. During the year ended December 31, 2021, we sold 762,825 shares of our common stock for an average price of $1.49 per share under the Sales Agreement.

On June 19, 2020, the Company entered into a senior secured loan agreement and related security agreements (the “Senior Credit Agreement”) with Oaktree Fund Administration, LLC as administrative agent, and the lenders party thereto (collectively “Oaktree”) to borrow up to $225.0 million in five tranches with a maturity date of June 19, 2026, bearing interest at a fixed annual rate of 11.0%. The first tranche of $100.0 million was drawn by the Company prior to June 30, 2020, with the proceeds used in part to repay in full the outstanding loan and fees under the credit agreement with Perceptive Advisors LLC and its affiliates (“Perceptive”), which resulted in a loss on extinguishment of debt of $7.2 million. The second tranche of $25.0 million was drawn by the Company prior to September 30, 2020 and the third tranche of $25.0 million was drawn by the Company prior to December 31, 2020. The additional debt tranches amounting to an aggregate of $75.0 million were subject to the approval Oral Paclitaxel in the treatment of mBC, and therefore, became unavailable to the Company when it decided to no longer pursue regulatory approval in the U.S. The Company is required to make quarterly interest-only payments until June 19, 2022, after which the Company is required to make quarterly amortizing payments, with the remaining balance of the principal plus accrued and unpaid interest due at maturity. The loan agreement contains specified financial maintenance covenants. The Company was in compliance with such covenants as of December 31, 2021.

In connection with the Senior Credit Agreement, the Company granted warrants to Oaktree to purchase an aggregate of up to 908,393 shares of the Company’s common stock at a purchase price of $12.63 per share. This transaction was accounted for as a detachable warrant at its fair value, using the relative fair value method, which is based on a number of unobservable inputs, and is recorded as an increase to additional paid-in-capital on the consolidated statement of stockholders’ equity. The fair value of the warrants was reflected as a discount to the term loan and amortized over the life of the term loan.

On January 19, 2022, the Company entered into an amendment to the Senior Credit Agreement with Oaktree (the “Amendment”). The Amendment also amended the warrants held by Oaktree that were issued on June 19, 2020 and August 4, 2020. The Amendment became effective on February 14, 2022, upon the closing of the Company’s sale of its leasehold interest in the manufacturing facility in Dunkirk, New York and certain other related assets (the “Dunkirk Transaction,” see Note 4 - Discontinued Operations). The Amendment provides that the Company make mandatory prepayment of principal to Oaktree equal to 62.5% of the cash proceeds of the Dunkirk Transaction. The Company was also required to pay (i) accrued and unpaid interest and (ii) a 7.0% fee, allocated as a 2.0% Exit Fee and a 5.0% Prepayment Fee (each as defined in the Senior Credit Agreement), on the principal amount being repaid. The Company was required to pay Oaktree an amendment fee of $0.3 million and certain related expenses upon the closing of the Dunkirk Transaction. The Amendment requires the Company to make an additional mandatory prepayment of $12.5 million in principal plus the costs and fees described above by June 14, 2022, within 120 days of the closing of the Dunkirk Transaction. Consistent with the Company’s decision to not pursue regulatory approval for Oral Paclitaxel monotherapy for the treatment of mBC in the United States, the Amendment reduced to zero the amount of the last two tranches of borrowing that had been available under the Senior Credit Agreement upon the achievement of commercial milestones. The warrants were amended to change the exercise price to be paid per share upon exercise of the warrants. The original exercise price of the warrants was $12.63 per share. The Amendment provides that the exercise price for 50% of the shares underlying the warrants will be $1.10 per share. The Dunkirk Transaction closed on February 14, 2021. The Company received proceeds of $40.0 million and used these proceeds to repay $27.4 million of the Senior Credit Agreement with Oaktree according to the terms of the Amendment.