Cover Page - USD ($) $ in Millions	12 Months Ended
Cover Page - USD ($) $ in Millions	Dec. 31, 2022	Mar. 13, 2023	Jun. 30, 2022
Document Information [Line Items]
Document Type	10-K/A
Amendment Flag	true
Document Period End Date	Dec. 31, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Trading Symbol	ATNX
Entity Registrant Name	ATHENEX, INC.
Entity Central Index Key	0001300699
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Small Business	true
Entity Common Stock, Shares Outstanding		8,663,209
Entity Public Float			$ 32.5
Entity Incorporation, State or Country Code	DE
Entity File Number	001-38112
Entity Tax Identification Number	43-1985966
Entity Address, Address Line One	1001 Main Street
Entity Address, Address Line Two	Suite 600
Entity Address, City or Town	Buffalo
Entity Address, State or Province	NY
Entity Address, Country	US
Entity Address, Postal Zip Code	14203
City Area Code	716
Local Phone Number	427-2950
Title of 12(b) Security	Common Stock, par value $0.001 per share
Security Exchange Name	NASDAQ
Document Annual Report	true
Document Transition Report	false
ICFR Auditor Attestation Flag	false
Amendment Description	Athenex, Inc. (the “Company,” “we,” “us,” or “our”) is filing this Amendment No. 1 (the “Amendment”) to our Annual Report on Form 10-K (the “Annual Report”) filed with the Securities and Exchange Commission (the “SEC”) for the sole purpose of providing the information required in Part III of our Annual Report within 120 days of the end of our 2022 fiscal year. The originally filed Annual Report incorporated the Part III information by reference to our Proxy Statement for our 2023 Annual Meeting of Stockholders (the “Annual Meeting”) to be filed within 120 days of the end of our 2022 fiscal year. The Annual Meeting has not been scheduled yet, and, accordingly, the Company’s Proxy Statement relating to such Annual Meeting will not be filed within 120 days of the end of our 2022 fiscal year. Except as described above, this Amendment does not amend any other information set forth in the originally filed Annual Report, and the Company has not updated disclosures included therein to reflect any subsequent events. This Amendment should be read in conjunction with the originally filed Annual Report.
Auditor Name	Deloitte & Touche LLP
Auditor Firm ID	34
Auditor Location	Williamsville, New York

Athenex, Inc. 10-K/A