Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2019	Jul. 31, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Trading Symbol	AIMT
Entity Registrant Name	AIMMUNE THERAPEUTICS, INC.
Entity Central Index Key	0001631650
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		62,668,957
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	001-37519
Entity Tax Identification Number	452748244
Entity Address, Address Line One	8000 Marina Blvd.
Entity Address, Address Line Two	Suite 300
Entity Address, City or Town	Brisbane
Entity Address, State or Province	California
Entity Address, Postal Zip Code	94005
City Area Code	650
Local Phone Number	614-5220