{"cik":2089982,"taxonomy":"us-gaap","tag":"Assets","label":"Assets","description":"Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.","entityName":"HCM IV ACQUISITION CORP.","units":{"USD":[{"end":"2025-12-31","val":160959,"accn":"0001213900-26-035836","fy":2025,"fp":"FY","form":"10-K","filed":"2026-03-30"},{"end":"2025-12-31","val":160959,"accn":"0001213900-26-056678","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-14"},{"end":"2025-12-31","val":160959,"accn":"0001213900-26-088962","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-08-13","frame":"CY2025Q4I"},{"end":"2026-03-31","val":289748874,"accn":"0001213900-26-056678","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-14","frame":"CY2026Q1I"},{"end":"2026-06-30","val":292145034,"accn":"0001213900-26-088962","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-08-13","frame":"CY2026Q2I"}]}}