v3.25.2
Cover
 3 Months Ended
Mar. 31, 2025
Entity Addresses [Line Items]  
Document Type S-4
Amendment Flag false
Entity Registrant Name CYCLACEL PHARMACEUTICALS, INC.
Entity Central Index Key 0001130166
Entity Tax Identification Number 93-2403210
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One Level 10, Tower 11
Entity Address, Address Line Two Avenue 5, The Horizon
Entity Address, Address Line Three Bangsar South City, No. 8, Jalan Kerinchi
Entity Address, City or Town Kuala Lumpur
Entity Address, Postal Zip Code 59200
City Area Code (908)
Local Phone Number 517-7330
Entity Filer Category Non-accelerated Filer
Entity Small Business true
Entity Emerging Growth Company false
Business Contact [Member]  
Entity Addresses [Line Items]  
Entity Address, Address Line One Level 10, Tower 11
Entity Address, Address Line Two Avenue 5, The Horizon
Entity Address, Address Line Three Bangsar South City, No. 8, Jalan Kerinchi
Entity Address, City or Town Kuala Lumpur
Entity Address, Country MY
Entity Address, Postal Zip Code 59200
City Area Code (908)
Local Phone Number 517-7330
Contact Personnel Name Datuk Dr. Doris Wong