Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2019	Jul. 31, 2019
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Entity Registrant Name	ANI PHARMACEUTICALS INC
Entity Current Reporting Status	Yes
Entity Central Index Key	0001023024
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Trading Symbol	ANIP
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Class C Special Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		10,864
Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		12,086,270