0001829802 2024-10-25 2024-10-25 0001829802 us-gaap:CommonStockMember 2024-10-25 2024-10-25 0001829802 us-gaap:SeriesAPreferredStockMember 2024-10-25 2024-10-25 false 0001829802 8-K 2024-10-25 Sensei Biotherapeutics, Inc. DE 001-39980 83-1863385 1405 Research Blvd Suite 125 Rockville MD 20850 (240) 243-8000 false false false false Common Stock SNSE NASDAQ Series A Preferred Stock Purchase Rights NASDAQ true false