Condensed Consolidated Statements of Stockholders' Equity (unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Treasury Stock	Total Athenex, Inc. Stockholders' Equity	Non-Controlling Interests
Beginning balance at Dec. 31, 2019	$ 175,855	$ 83	$ 763,648	$ (567,465)	$ (635)	$ (7,406)	$ 188,225	$ (12,370)
Beginning balance, shares at Dec. 31, 2019		83,231,063				(1,672,920)
Stock-based compensation cost	1,864		1,864				1,864
Restricted stock expense	397		397				397
Restricted stock expense, shares		(3,000)
Stock options exercised	344		344				344
Stock options exercised, shares		70,200
Net loss	(19,718)			(19,429)			(19,429)	(289)
Other comprehensive income (loss), net of tax	(506)				(506)		(506)
Ending balance at Mar. 31, 2020	158,236	$ 83	766,253	(586,894)	(1,141)	$ (7,406)	170,895	(12,659)
Ending balance, shares at Mar. 31, 2020		83,298,263				(1,672,920)
Beginning balance at Dec. 31, 2020	165,348	$ 95	901,864	(713,644)	(1,134)	$ (7,406)	179,775	(14,427)
Beginning balance, shares at Dec. 31, 2020		95,066,195				(1,672,920)
Stock-based compensation cost	2,205		2,205				2,205
Restricted stock expense	29		29				29
Stock options exercised	$ 852		852				852
Stock options exercised, shares	119,425	119,425
Net loss	$ (25,603)			(25,050)			(25,050)	(553)
Other comprehensive income (loss), net of tax	293				293		293
Ending balance at Mar. 31, 2021	$ 143,124	$ 95	$ 904,950	$ (738,694)	$ (841)	$ (7,406)	$ 158,104	$ (14,980)
Ending balance, shares at Mar. 31, 2021		95,185,620				(1,672,920)