Condensed Consolidated Statements of Stockholders' Equity (unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Total Athenex, Inc. Stockholders' Equity	Non-Controlling Interests
Beginning balance at Dec. 31, 2018	$ 128,769	$ 69	$ 591,064	$ (443,716)	$ (656)	$ (7,406)	$ 139,355	$ (10,586)
Beginning balance, shares at Dec. 31, 2018		68,668,986				(1,672,920)
Stock-based compensation cost	1,693		1,693				1,693
Stock options and warrants exercised	278		278				278
Stock options and warrants exercised, shares		49,632
Net loss	(36,230)			(35,233)			(35,233)	(997)
Other comprehensive income (loss), net of tax	1,071				1,071		1,071
Ending balance at Mar. 31, 2019	95,581	$ 69	593,035	(478,949)	415	$ (7,406)	107,164	(11,583)
Ending balance, shares at Mar. 31, 2019		68,718,618				(1,672,920)
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	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)