Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2022	Jul. 22, 2022
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Amendment Flag	false
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q2
Document Period End Date	Jun. 30, 2022
Entity Registrant Name	ATHENEX, INC.
Entity Central Index Key	0001300699
Entity Tax Identification Number	43-1985966
Entity Incorporation, State or Country Code	DE
Entity File Number	001-38112
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
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, 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
Trading Symbol	ATNX
Current Fiscal Year End Date	--12-31
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		121,608,388