Condensed Consolidated Statements of Stockholders' Deficit (unaudited) - USD ($) $ in Thousands	Total	Public Offering	Common Stock	Common Stock Public Offering	Common Stock Cidal	Additional Paid-in Capital	Additional Paid-in Capital Public Offering	Accumulated Deficit	Accumulated Other Comprehensive Loss	Treasury Stock	Total Athenex, Inc. Stockholders' Equity	Total Athenex, Inc. Stockholders' Equity Public Offering	Non-Controlling Interests
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
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)
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)
Net loss	(96,954)
Ending balance at Sep. 30, 2021	135,879		$ 111			969,315		(809,025)	(1,037)	$ (7,485)	151,879		(16,000)
Ending balance, shares at Sep. 30, 2021			110,991,959							(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)
Ending balance at Dec. 31, 2021	34,452		$ 111			972,404		(913,412)	(487)	$ (7,485)	51,131		(16,679)
Ending balance, shares at Dec. 31, 2021			111,802,968							(1,672,920)
Beginning balance at Mar. 31, 2021	143,124		$ 95			904,950		(738,694)	(841)	$ (7,406)	158,104		(14,980)
Beginning balance, shares at Mar. 31, 2021			95,185,620							(1,672,920)
Sale of common stock, shares			33,373
Sale of common stock	133					133					133
Issuance of common stock in connection with acquisition of Kuur and settlement of transaction incentive liability assumed, shares			15,601,667
Issuance of common stock in connection with acquisition of Kuur and settlement of transaction incentive liability assumed	58,428		$ 16			58,412					58,428
Stock-based compensation cost	2,387					2,387					2,387
Restricted stock expense	57					57					57
Stock options exercised	727					727					727
Stock options exercised, shares			160,000
Treasury stock repurchase	(79)									$ (79)	(79)
Net loss	(34,615)							(34,274)			(34,274)		(341)
Other comprehensive income (loss), net of tax	(282)								(282)		(282)
Ending balance at Jun. 30, 2021	169,880		$ 111			966,666		(772,968)	(1,123)	$ (7,485)	185,201		(15,321)
Ending balance, shares at Jun. 30, 2021			110,980,660							(1,672,920)
Issuance of common stock in connection with acquisition of Kuur and settlement of transaction incentive liability assumed, shares					11,299
Stock-based compensation cost	2,450					2,450					2,450
Restricted stock expense	199					199					199
Net loss	(36,736)							(36,057)			(36,057)		(679)
Other comprehensive income (loss), net of tax	86								86		86
Ending balance at Sep. 30, 2021	135,879		$ 111			969,315		(809,025)	(1,037)	$ (7,485)	151,879		(16,000)
Ending balance, shares at Sep. 30, 2021			110,991,959							(1,672,920)
Beginning balance at Dec. 31, 2021	34,452		$ 111			972,404		(913,412)	(487)	$ (7,485)	51,131		(16,679)
Beginning balance, shares at Dec. 31, 2021			111,802,968							(1,672,920)
Sale of common stock through ATM shares			1,646,026
Sale of common stock through ATM	1,695		$ 2			1,693					1,695
Stock-based compensation cost	1,623					1,623					1,623
Restricted stock expense	251					251					251
Issuance of warrants	148					148					148
Net loss	(17,932)							(17,420)			(17,420)		(512)
Other comprehensive income (loss), net of tax	562								562		562
Ending balance at Mar. 31, 2022	20,799		$ 113			976,119		(930,832)	75	$ (7,485)	37,990		(17,191)
Ending balance, shares at Mar. 31, 2022			113,448,994							(1,672,920)
Beginning balance at Dec. 31, 2021	34,452		$ 111			972,404		(913,412)	(487)	$ (7,485)	51,131		(16,679)
Beginning balance, shares at Dec. 31, 2021			111,802,968							(1,672,920)
Net loss	(70,175)
Ending balance at Sep. 30, 2022	7,236		$ 159			1,012,114		(982,658)	2,987	$ (7,757)	24,845		(17,609)
Ending balance, shares at Sep. 30, 2022			159,108,639							(1,698,541)
Beginning balance at Mar. 31, 2022	20,799		$ 113			976,119		(930,832)	75	$ (7,485)	37,990		(17,191)
Beginning balance, shares at Mar. 31, 2022			113,448,994							(1,672,920)
Sale of common stock through ATM shares			5,501,866
Sale of common stock through ATM	2,780		$ 5			2,775					2,780
Sale of common stock through ESPP shares			372,963
Sale of common stock through ESPP	188		$ 1			187					188
Stock-based compensation cost	1,358					1,358					1,358
Restricted stock expense	245					245					245
Issuance of warrants	135					135					135
Net loss	(32,374)							(32,157)			(32,157)		(217)
Other comprehensive income (loss), net of tax	1,396								1,396		1,396
Ending balance at Jun. 30, 2022	(5,473)		$ 119			980,819		(962,989)	1,471	$ (7,485)	11,935		(17,408)
Ending balance, shares at Jun. 30, 2022			119,323,823							(1,672,920)
Sale of common stock, shares				35,333,334
Sale of common stock		$ 17,773		$ 35			$ 17,738					$ 17,773
Sale of common stock through ATM shares			3,957,485
Sale of common stock through ATM	1,599		$ 4			1,595					1,599
Sale of common stock through ESPP shares			359,097
Sale of common stock through ESPP	188		$ 1			187					188
Issuance of pre-funded warrants, net of costs of $155	2,343					2,343					2,343
Stock-based compensation cost	1,268					1,268					1,268
Vesting of restricted stock units	141					141					141
Vesting of restricted stock units, shares			134,900
Treasury stock repurchase	(272)									$ (272)	(272)
Treasury stock repurchase, shares										(25,621)
Issuance of warrants	8,023					8,023					8,023
Net loss	(19,870)							(19,669)			(19,669)		(201)
Other comprehensive income (loss), net of tax	1,516								1,516		1,516
Ending balance at Sep. 30, 2022	$ 7,236		$ 159			$ 1,012,114		$ (982,658)	$ 2,987	$ (7,757)	$ 24,845		$ (17,609)
Ending balance, shares at Sep. 30, 2022			159,108,639							(1,698,541)