Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Mar. 02, 2021	Jun. 30, 2020
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Document Transition Report	false
Entity File Number	001-31812
Entity Registrant Name	ANI PHARMACEUTICALS, INC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	58-2301143
Entity Address, Address Line One	210 Main Street West
Entity Address, City or Town	Baudette
Entity Address, State or Province	MN
Entity Address, Postal Zip Code	56623
City Area Code	218
Local Phone Number	634-3500
Title of 12(b) Security	Common Stock
Trading Symbol	ANIP
Security Exchange Name	NASDAQ
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 316.1
Entity Central Index Key	0001023024
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Amendment Flag	false
Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		12,354,398
Class C Special Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		10,864