v3.25.1
Cover
Apr. 25, 2025
Document Information [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date Apr. 25, 2025
Entity File Number 001-39927
Entity Registrant Name SeaStar Medical Holding Corporation
Entity Central Index Key 0001831868
Entity Tax Identification Number 85-3681132
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 3513 Brighton Blvd,
Entity Address, Address Line Two Suite 410
Entity Address, City or Town Denver
Entity Address, State or Province CO
Entity Address, Postal Zip Code 80216
City Area Code 844
Local Phone Number 427-8100
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company true
Entity Ex Transition Period false
Common Stock [Member]  
Document Information [Line Items]  
Title of 12(b) Security Common Stock par value $0.0001 per share
Trading Symbol ICU
Security Exchange Name NASDAQ
Warrants [Member]  
Document Information [Line Items]  
Title of 12(b) Security Warrants, each whole warrant exercisable for one share of Common Stock for $11.50 per share
Trading Symbol ICUCW
Security Exchange Name NASDAQ