{"cik":1326190,"taxonomy":"us-gaap","tag":"LongTermDebt","label":"Long-term Debt","description":"Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.","entityName":"ALTIMMUNE, INC.","units":{"EUR":[{"end":"2017-12-31","val":500000,"accn":"0001564590-19-010429","fy":2018,"fp":"FY","form":"10-K","filed":"2019-04-01","frame":"CY2017Q4I"},{"end":"2018-12-31","val":500000,"accn":"0001564590-19-010429","fy":2018,"fp":"FY","form":"10-K","filed":"2019-04-01","frame":"CY2018Q4I"},{"end":"2019-03-31","val":500000,"accn":"0001564590-19-019139","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-14","frame":"CY2019Q1I"},{"end":"2019-06-30","val":500000,"accn":"0001564590-19-031795","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-13","frame":"CY2019Q2I"}],"USD":[{"end":"2012-06-30","val":2500000,"accn":"0001144204-12-043389","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-07","frame":"CY2012Q2I"},{"end":"2012-09-30","val":2500000,"accn":"0001144204-12-059795","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-06","frame":"CY2012Q3I"},{"end":"2013-09-30","val":2000002,"accn":"0001144204-13-059676","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2014-03-31","val":1485384,"accn":"0001144204-14-028677","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-08","frame":"CY2014Q1I"},{"end":"2014-06-30","val":1239734,"accn":"0001144204-14-046858","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-05","frame":"CY2014Q2I"},{"end":"2014-09-30","val":993322,"accn":"0001144204-14-065679","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-06","frame":"CY2014Q3I"},{"end":"2016-12-31","val":525950,"accn":"0001193125-17-256136","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-14"},{"end":"2016-12-31","val":525950,"accn":"0001193125-17-338977","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2016Q4I"},{"end":"2017-06-30","val":570545,"accn":"0001193125-17-256136","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-14","frame":"CY2017Q2I"},{"end":"2017-09-30","val":590185,"accn":"0001193125-17-338977","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":599927,"accn":"0001564590-19-010429","fy":2018,"fp":"FY","form":"10-K","filed":"2019-04-01","frame":"CY2017Q4I"},{"end":"2018-12-31","val":572770,"accn":"0001564590-19-010429","fy":2018,"fp":"FY","form":"10-K","filed":"2019-04-01","frame":"CY2018Q4I"},{"end":"2019-03-31","val":561577,"accn":"0001564590-19-019139","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-14","frame":"CY2019Q1I"},{"end":"2019-06-30","val":568321,"accn":"0001564590-19-031795","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-13","frame":"CY2019Q2I"},{"end":"2025-12-31","val":34287000,"accn":"0001326190-26-000018","fy":2025,"fp":"FY","form":"10-K","filed":"2026-03-06"},{"end":"2025-12-31","val":34287000,"accn":"0001326190-26-000040","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-13"},{"end":"2025-12-31","val":34287000,"accn":"0001326190-26-000052","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-08-12","frame":"CY2025Q4I"},{"end":"2026-03-31","val":34505000,"accn":"0001326190-26-000040","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-13","frame":"CY2026Q1I"},{"end":"2026-06-30","val":34742000,"accn":"0001326190-26-000052","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-08-12","frame":"CY2026Q2I"}]}}