Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2023	May 03, 2023
Document Information Line Items
Entity Registrant Name	HUMANIGEN, INC
Trading Symbol	HGEN
Document Type	10-Q
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		119,080,135
Amendment Flag	false
Entity Central Index Key	0001293310
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Document Period End Date	Mar. 31, 2023
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q1
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Document Quarterly Report	true
Document Transition Report	false
Entity File Number	001-35798
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	77-0557236
Entity Address, Address Line One	830 Morris Turnpike
Entity Address, Address Line Two	4th Floor
Entity Address, City or Town	Short Hills
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	07078
City Area Code	(973)
Local Phone Number	200-3100
Title of 12(b) Security	Common Stock
Security Exchange Name	NASDAQ
Entity Interactive Data Current	Yes