Cover	9 Months Ended
	Sep. 30, 2023 shares
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Sep. 30, 2023
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2023
Current Fiscal Year End Date	--12-31
Entity File Number	001-38630
Entity Registrant Name	Aridis Pharmaceuticals, Inc.
Entity Central Index Key	0001614067
Entity Tax Identification Number	47-2641188
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	983 University Avenue
Entity Address, Address Line Two	Bldg. B
Entity Address, City or Town	Los Gatos
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	95032
City Area Code	(408)
Local Phone Number	385-1742
Title of 12(b) Security	Common Stock
Trading Symbol	ARDS
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Elected Not To Use the Extended Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding	44,574,021