v3.25.3
Document and Entity Information
Oct. 28, 2025
Document And Entity Information [Line Items]  
Document Type 8-K
Document Period End Date Oct. 28, 2025
Entity Registrant Name KALARIS THERAPEUTICS, INC.
Entity Incorporation State Country Code DE
Entity File Number 001-39409
Entity Tax Identification Number 83-1971007
Entity Address Address Line 1 400 Connell Drive
Entity Address Address Line 2 Suite 5500
Entity Address City Or Town Berkeley Heights
Entity Address State Or Province NJ
Entity Address Postal Zip Code 07922
City Area Code 650
Local Phone Number 249-2727
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, $0.0001 par value per share
Trading Symbol KLRS
Security Exchange Name NASDAQ
Entity Emerging Growth Company true
Entity Ex Transition Period false
Amendment Flag false
Entity Central Index Key 0001754068
Former Address [Member]  
Document And Entity Information [Line Items]  
Entity Address Address Line 1 628 Middlefield Rd.
Entity Address Address Line 2 Suite 5500
Entity Address City Or Town Palo Alto
Entity Address State Or Province CA
Entity Address Postal Zip Code 94301