Company and Nature of Business	3 Months Ended
Mar. 31, 2020
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Company and Nature of Business	1. Company and Nature of Business Organization and Description of Business Athenex, Inc. and subsidiaries (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 global 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’s current clinical pipeline is derived from Orascovery, Src Kinase Inhibition, T-cell receptor-engineered T-cells (“TCR-T”), and Arginine Deprivation Therapy technology platforms. The Company has assembled a strong and experienced leadership team and has established global operations across the pharmaceutical value chain to execute its goal of becoming a global leader in bringing innovative cancer treatments to the market and improve health outcomes. 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, recruiting personnel, 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”). Significant Risks and Uncertainties The Company has incurred operating losses since its inception and, as a result, as of March 31, 2020 and December 31, 2019 had an accumulated deficit of $586.9 million and $567.5 million, respectively. As of March 31, 2020, the Company had cash and cash equivalents of $72.0 million, which included $8.7 million funded by New York State for the construction of the Dunkirk facility, and short-term investments of $41.7 million. The Company believes that the existing cash, cash equivalents, and short-term investments will be sufficient to fund current operating plans into the first quarter of 2021 but will not be sufficient to fund current operating plans through one year after the date that these condensed consolidated financial statements are issued. The Company has based these estimates on assumptions that may prove to be wrong, and it could spend the available financial resources much faster than expected and need to raise additional funds sooner than anticipated. Operations have been funded primarily through the sale of common stock and, to a lesser extent, from convertible bond financing, a senior secured loan, revenue, and grant funding. The Company will require significant additional funds to conduct clinical trials and to fund its commercialization operations. There can be no assurances, however, that additional funding will be available on favorable terms, or at all. Specifically, disruptions in the capital markets and the operations of commercial partners due to the COVID-19 pandemic may make it difficult for us to raise additional funds. If adequate funds are not available, the Company may be required to delay, modify, or terminate its research and development programs or reduce its planned commercialization efforts. Further, if the Company is unable to obtain additional financing, the Company will need to reevaluate future operating plans. Although the Company’s plans to raise additional funds, these plans are subject to market conditions which are outside of its control, and therefore cannot be deemed to be probable; as such, those plans do not alleviate substantial doubt about its ability to continue as a going concern. These condensed consolidated financial statements have been prepared on a going concern basis, which implies the Company will continue to realize its assets and discharge its liabilities in the normal course of the business. The Company’s recurring losses from operations and negative cash flows from operations have raised substantial doubt regarding its ability to continue as a going concern. The condensed 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. The Company has a senior secured loan agreement with Perceptive Advisors LLC (“Perceptive”) which contains various covenants. A breach of any of these covenants could result in a default. If a default under this loan agreement is not cured or waived, the default could result in the acceleration of debt, which could require the Company to repay the debt in full prior to the date it is otherwise due. If the Company defaults, the lender may seek repayment through the Company’s subsidiary guarantors or by executing on the security interest granted pursuant to the loan agreement. 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 marketing approval of product candidates, competitors developing new technological innovations, unsuccessful commercialization strategy and launch plans for its proprietary drug candidates, market acceptance of the Company’s products, and protection of proprietary technology. If the Company does not successfully commercialize any of its product candidates, it will be unable to generate sufficient product revenue and might not, if ever, achieve profitability and positive cash flow.

Company and Nature of Business

3 Months Ended

Mar. 31, 2020

Organization Consolidation And Presentation Of Financial Statements [Abstract]

1. Company and Nature of Business

Organization and Description of Business

Athenex, Inc. and subsidiaries (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 global 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’s current clinical pipeline is derived from Orascovery, Src Kinase Inhibition, T-cell receptor-engineered T-cells (“TCR-T”), and Arginine Deprivation Therapy technology platforms. The Company has assembled a strong and experienced leadership team and has established global operations across the pharmaceutical value chain to execute its goal of becoming a global leader in bringing innovative cancer treatments to the market and improve health outcomes. 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, recruiting personnel, 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”).

Significant Risks and Uncertainties

The Company has incurred operating losses since its inception and, as a result, as of March 31, 2020 and December 31, 2019 had an accumulated deficit of $586.9 million and $567.5 million, respectively. As of March 31, 2020, the Company had cash and cash equivalents of $72.0 million, which included $8.7 million funded by New York State for the construction of the Dunkirk facility, and short-term investments of $41.7 million. The Company believes that the existing cash, cash equivalents, and short-term investments will be sufficient to fund current operating plans into the first quarter of 2021 but will not be sufficient to fund current operating plans through one year after the date that these condensed consolidated financial statements are issued. The Company has based these estimates on assumptions that may prove to be wrong, and it could spend the available financial resources much faster than expected and need to raise additional funds sooner than anticipated. Operations have been funded primarily through the sale of common stock and, to a lesser extent, from convertible bond financing, a senior secured loan, revenue, and grant funding. The Company will require significant additional funds to conduct clinical trials and to fund its commercialization operations. There can be no assurances, however, that additional funding will be available on favorable terms, or at all. Specifically, disruptions in the capital markets and the operations of commercial partners due to the COVID-19 pandemic may make it difficult for us to raise additional funds. If adequate funds are not available, the Company may be required to delay, modify, or terminate its research and development programs or reduce its planned commercialization efforts. Further, if the Company is unable to obtain additional financing, the Company will need to reevaluate future operating plans. Although the Company’s plans to raise additional funds, these plans are subject to market conditions which are outside of its control, and therefore cannot be deemed to be probable; as such, those plans do not alleviate substantial doubt about its ability to continue as a going concern.

These condensed consolidated financial statements have been prepared on a going concern basis, which implies the Company will continue to realize its assets and discharge its liabilities in the normal course of the business. The Company’s recurring losses from operations and negative cash flows from operations have raised substantial doubt regarding its ability to continue as a going concern. The condensed 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.

The Company has a senior secured loan agreement with Perceptive Advisors LLC (“Perceptive”) which contains various covenants. A breach of any of these covenants could result in a default. If a default under this loan agreement is not cured or waived, the default could result in the acceleration of debt, which could require the Company to repay the debt in full prior to the date it is otherwise due. If the Company defaults, the lender may seek repayment through the Company’s subsidiary guarantors or by executing on the security interest granted pursuant to the loan agreement.

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 marketing approval of product candidates, competitors developing new technological innovations, unsuccessful commercialization strategy and launch plans for its proprietary drug candidates, market acceptance of the Company’s products, and protection of proprietary technology. If the Company does not successfully commercialize any of its product candidates, it will be unable to generate sufficient product revenue and might not, if ever, achieve profitability and positive cash flow.