{"cik":2093101,"taxonomy":"us-gaap","tag":"OperatingLeaseRightOfUseAsset","label":"Operating Lease, Right-of-Use Asset","description":"Amount of lessee's right to use underlying asset under operating lease.","entityName":"Atrium Therapeutics, Inc.","units":{"USD":[{"end":"2025-12-31","val":2784000,"accn":"0001193125-26-224243","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-14","frame":"CY2025Q4I"},{"end":"2026-03-31","val":2043000,"accn":"0001193125-26-224243","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-14","frame":"CY2026Q1I"}]}}