0001831868 2025-08-13 2025-08-13 0001831868 icu:CommonStockParValue00001PerShareCustomMember 2025-08-13 2025-08-13 0001831868 icu:WarrantsEachWholeWarrantExercisableForOneShareOfCommonStockFor1150PerShareCustomMember 2025-08-13 2025-08-13 David Green Separation Update true 0001831868 8-K/A 2025-08-13 SeaStar Medical Holding Corporation DE 001-39927 85-3681132 3513 Brighton Blvd Suite 410 Denver CO 80216 844 427-8100 false false false false Common Stock par value $0.0001 per share ICU NASDAQ Warrants, each whole warrant exercisable for one share of Common Stock for $11.50 per share ICUCW NASDAQ true false