Business Segment, Geographic, and Concentration Risk Information - Summary of Segment Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net loss attributable to Athenex, Inc.:
Total consolidated net loss attributable to Athenex, Inc.	$ (199,768)	$ (146,179)	$ (123,749)
Operating Segments
Net loss attributable to Athenex, Inc.:
Total consolidated net loss attributable to Athenex, Inc.	(192,037)	(142,183)	(123,260)
Operating Segments | Oncology Innovation Platform
Net loss attributable to Athenex, Inc.:
Total consolidated net loss attributable to Athenex, Inc.	(118,089)	(89,189)	(100,919)
Operating Segments | Global Supply Chain Platform
Net loss attributable to Athenex, Inc.:
Total consolidated net loss attributable to Athenex, Inc.	(38,566)	(15,404)	(8,086)
Operating Segments | Commercial Platform
Net loss attributable to Athenex, Inc.:
Total consolidated net loss attributable to Athenex, Inc.	(35,382)	(37,590)	(14,255)
Discontinued operations
Net loss attributable to Athenex, Inc.:
Total consolidated net loss attributable to Athenex, Inc.	$ (7,731)	$ (3,996)	$ (489)