{"cik":1326190,"taxonomy":"us-gaap","tag":"ShareBasedCompensation","label":"Share-based Payment Arrangement, Noncash Expense","description":"Amount of noncash expense for share-based payment arrangement.","entityName":"Altimmune, Inc.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":2513159,"accn":"0001144204-12-013807","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-08"},{"start":"2010-01-01","end":"2010-12-31","val":2513159,"accn":"0001144204-13-014894","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-14","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":710625,"accn":"0001144204-12-027422","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-10","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":1255325,"accn":"0001144204-12-043389","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-07"},{"start":"2011-01-01","end":"2011-09-30","val":1881416,"accn":"0001144204-12-059795","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-06"},{"start":"2011-01-01","end":"2011-12-31","val":2565961,"accn":"0001144204-12-013807","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-08"},{"start":"2011-01-01","end":"2011-12-31","val":2565961,"accn":"0001144204-13-014894","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":2565961,"accn":"0001144204-14-014930","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-11","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":548664,"accn":"0001144204-12-027422","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-10"},{"start":"2012-01-01","end":"2012-03-31","val":548664,"accn":"0001144204-13-027117","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-08","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":1060705,"accn":"0001144204-12-043389","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-07"},{"start":"2012-01-01","end":"2012-06-30","val":1060705,"accn":"0001144204-13-043745","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-08"},{"start":"2012-01-01","end":"2012-09-30","val":1499910,"accn":"0001144204-12-059795","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-06"},{"start":"2012-01-01","end":"2012-09-30","val":1499910,"accn":"0001144204-13-059676","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":1894099,"accn":"0001144204-13-014894","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-14"},{"start":"2012-01-01","end":"2012-12-31","val":1894099,"accn":"0001144204-14-014930","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-11"},{"start":"2012-01-01","end":"2012-12-31","val":1894099,"accn":"0001144204-15-015393","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-11","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":328581,"accn":"0001144204-13-027117","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-08"},{"start":"2013-01-01","end":"2013-03-31","val":328581,"accn":"0001144204-14-028677","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-08","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":652589,"accn":"0001144204-13-043745","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-08"},{"start":"2013-01-01","end":"2013-06-30","val":652589,"accn":"0001144204-14-046858","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-05"},{"start":"2013-01-01","end":"2013-09-30","val":957261,"accn":"0001144204-13-059676","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":957261,"accn":"0001144204-14-065679","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-06"},{"start":"2013-01-01","end":"2013-12-31","val":1362716,"accn":"0001144204-14-014930","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-11"},{"start":"2013-01-01","end":"2013-12-31","val":1362716,"accn":"0001144204-15-015393","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-11"},{"start":"2013-01-01","end":"2013-12-31","val":1362716,"accn":"0001144204-16-087617","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-11","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":528878,"accn":"0001144204-14-028677","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-08"},{"start":"2014-01-01","end":"2014-03-31","val":528878,"accn":"0001144204-15-028415","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-07","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":891983,"accn":"0001144204-14-046858","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-05"},{"start":"2014-01-01","end":"2014-06-30","val":891983,"accn":"0001144204-15-046591","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-05"},{"start":"2014-01-01","end":"2014-09-30","val":1172703,"accn":"0001144204-14-065679","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-06"},{"start":"2014-01-01","end":"2014-09-30","val":1172703,"accn":"0001144204-15-063377","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-06"},{"start":"2014-01-01","end":"2014-12-31","val":1655647,"accn":"0001144204-15-015393","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-11"},{"start":"2014-01-01","end":"2014-12-31","val":1655647,"accn":"0001144204-16-087617","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-11"},{"start":"2014-01-01","end":"2014-12-31","val":1655647,"accn":"0001144204-17-014528","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-14","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":199627,"accn":"0001144204-15-028415","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-07"},{"start":"2015-01-01","end":"2015-03-31","val":199627,"accn":"0001144204-16-100010","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-09","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":333231,"accn":"0001144204-15-046591","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-05"},{"start":"2015-01-01","end":"2015-06-30","val":333231,"accn":"0001144204-16-116648","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-04"},{"start":"2015-01-01","end":"2015-09-30","val":426988,"accn":"0001144204-15-063377","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-06"},{"start":"2015-01-01","end":"2015-09-30","val":426988,"accn":"0001144204-16-131743","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-04"},{"start":"2015-01-01","end":"2015-12-31","val":613017,"accn":"0001144204-16-087617","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-11"},{"start":"2015-01-01","end":"2015-12-31","val":613017,"accn":"0001144204-17-014528","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-14","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":181921,"accn":"0001144204-16-100010","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-09"},{"start":"2016-01-01","end":"2016-03-31","val":181921,"accn":"0001144204-17-024254","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-03","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":348720,"accn":"0001144204-16-116648","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-04"},{"start":"2016-01-01","end":"2016-06-30","val":389729,"accn":"0001193125-17-256136","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-14"},{"start":"2016-01-01","end":"2016-09-30","val":1896542,"accn":"0001144204-16-131743","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-04"},{"start":"2016-01-01","end":"2016-09-30","val":584784,"accn":"0001193125-17-338977","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-01-01","end":"2016-12-31","val":2240015,"accn":"0001144204-17-014528","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-14"},{"start":"2016-01-01","end":"2016-12-31","val":965365,"accn":"0001193125-18-103623","fy":2017,"fp":"FY","form":"10-K","filed":"2018-04-02","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":66180,"accn":"0001144204-17-024254","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-03"},{"start":"2017-01-01","end":"2017-03-31","val":345036,"accn":"0001193125-18-164171","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-15","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":684088,"accn":"0001193125-17-256136","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-14"},{"start":"2017-01-01","end":"2017-06-30","val":684088,"accn":"0001193125-18-248492","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-01-01","end":"2017-09-30","val":1137125,"accn":"0001193125-17-338977","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":1137125,"accn":"0001193125-18-325587","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-13"},{"start":"2017-01-01","end":"2017-12-31","val":1443492,"accn":"0001193125-18-103623","fy":2017,"fp":"FY","form":"10-K","filed":"2018-04-02"},{"start":"2017-01-01","end":"2017-12-31","val":1443492,"accn":"0001564590-19-010429","fy":2018,"fp":"FY","form":"10-K","filed":"2019-04-01","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":356709,"accn":"0001193125-18-164171","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-15"},{"start":"2018-01-01","end":"2018-03-31","val":356709,"accn":"0001564590-19-019139","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-14","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":608893,"accn":"0001193125-18-248492","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-01-01","end":"2018-06-30","val":608893,"accn":"0001564590-19-031795","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-13"},{"start":"2018-01-01","end":"2018-09-30","val":704425,"accn":"0001193125-18-325587","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-13"},{"start":"2018-01-01","end":"2018-09-30","val":704425,"accn":"0001564590-19-043231","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-13"},{"start":"2018-01-01","end":"2018-12-31","val":773248,"accn":"0001564590-19-010429","fy":2018,"fp":"FY","form":"10-K","filed":"2019-04-01"},{"start":"2018-01-01","end":"2018-12-31","val":773248,"accn":"0001564590-20-013377","fy":2019,"fp":"FY","form":"10-K","filed":"2020-03-27","frame":"CY2018"},{"start":"2019-01-01","end":"2019-03-31","val":407714,"accn":"0001564590-19-019139","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-14"},{"start":"2019-01-01","end":"2019-03-31","val":407714,"accn":"0001564590-20-025123","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-05-13","frame":"CY2019Q1"},{"start":"2019-01-01","end":"2019-06-30","val":697486,"accn":"0001564590-19-031795","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-13"},{"start":"2019-01-01","end":"2019-06-30","val":697486,"accn":"0001564590-20-039314","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-08-11"},{"start":"2019-01-01","end":"2019-09-30","val":985260,"accn":"0001564590-19-043231","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-13"},{"start":"2019-01-01","end":"2019-09-30","val":985260,"accn":"0001564590-20-052524","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-09"},{"start":"2019-01-01","end":"2019-12-31","val":1264231,"accn":"0001564590-20-013377","fy":2019,"fp":"FY","form":"10-K","filed":"2020-03-27"},{"start":"2019-01-01","end":"2019-12-31","val":1264231,"accn":"0001564590-21-008422","fy":2020,"fp":"FY","form":"10-K","filed":"2021-02-25","frame":"CY2019"},{"start":"2020-01-01","end":"2020-03-31","val":214921,"accn":"0001564590-20-025123","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-05-13"},{"start":"2020-01-01","end":"2020-03-31","val":214921,"accn":"0001564590-21-028166","fy":2021,"fp":"Q1","form":"10-Q","filed":"2021-05-17","frame":"CY2020Q1"},{"start":"2020-01-01","end":"2020-06-30","val":545431,"accn":"0001564590-20-039314","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-08-11"},{"start":"2020-01-01","end":"2020-06-30","val":545431,"accn":"0001558370-21-011132","fy":2021,"fp":"Q2","form":"10-Q","filed":"2021-08-10"},{"start":"2020-01-01","end":"2020-09-30","val":1865520,"accn":"0001564590-20-052524","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-09"},{"start":"2020-01-01","end":"2020-09-30","val":1865520,"accn":"0001558370-21-015292","fy":2021,"fp":"Q3","form":"10-Q","filed":"2021-11-09"},{"start":"2020-01-01","end":"2020-12-31","val":2576006,"accn":"0001564590-21-008422","fy":2020,"fp":"FY","form":"10-K","filed":"2021-02-25"},{"start":"2020-01-01","end":"2020-12-31","val":2576006,"accn":"0001558370-22-003659","fy":2021,"fp":"FY","form":"10-K","filed":"2022-03-15","frame":"CY2020"},{"start":"2021-01-01","end":"2021-03-31","val":1218351,"accn":"0001564590-21-028166","fy":2021,"fp":"Q1","form":"10-Q","filed":"2021-05-17"},{"start":"2021-01-01","end":"2021-03-31","val":1218000,"accn":"0001558370-22-008535","fy":2022,"fp":"Q1","form":"10-Q","filed":"2022-05-12","frame":"CY2021Q1"},{"start":"2021-01-01","end":"2021-06-30","val":2703180,"accn":"0001558370-21-011132","fy":2021,"fp":"Q2","form":"10-Q","filed":"2021-08-10"},{"start":"2021-01-01","end":"2021-06-30","val":2703000,"accn":"0001558370-22-013271","fy":2022,"fp":"Q2","form":"10-Q","filed":"2022-08-11"},{"start":"2021-01-01","end":"2021-09-30","val":4200064,"accn":"0001558370-21-015292","fy":2021,"fp":"Q3","form":"10-Q","filed":"2021-11-09"},{"start":"2021-01-01","end":"2021-09-30","val":4200000,"accn":"0001326190-22-000013","fy":2022,"fp":"Q3","form":"10-Q","filed":"2022-11-10"},{"start":"2021-01-01","end":"2021-12-31","val":5518890,"accn":"0001558370-22-003659","fy":2021,"fp":"FY","form":"10-K","filed":"2022-03-15"},{"start":"2021-01-01","end":"2021-12-31","val":5519000,"accn":"0001326190-23-000008","fy":2022,"fp":"FY","form":"10-K","filed":"2023-02-28","frame":"CY2021"},{"start":"2022-01-01","end":"2022-03-31","val":2033000,"accn":"0001558370-22-008535","fy":2022,"fp":"Q1","form":"10-Q","filed":"2022-05-12"},{"start":"2022-01-01","end":"2022-03-31","val":2033000,"accn":"0001326190-23-000028","fy":2023,"fp":"Q1","form":"10-Q","filed":"2023-05-11","frame":"CY2022Q1"},{"start":"2022-01-01","end":"2022-06-30","val":4081000,"accn":"0001558370-22-013271","fy":2022,"fp":"Q2","form":"10-Q","filed":"2022-08-11"},{"start":"2022-01-01","end":"2022-06-30","val":4081000,"accn":"0001326190-23-000036","fy":2023,"fp":"Q2","form":"10-Q","filed":"2023-08-10"},{"start":"2022-01-01","end":"2022-09-30","val":6209000,"accn":"0001326190-22-000013","fy":2022,"fp":"Q3","form":"10-Q","filed":"2022-11-10"},{"start":"2022-01-01","end":"2022-09-30","val":6209000,"accn":"0001326190-23-000047","fy":2023,"fp":"Q3","form":"10-Q","filed":"2023-11-07"},{"start":"2022-01-01","end":"2022-12-31","val":8101000,"accn":"0001326190-23-000008","fy":2022,"fp":"FY","form":"10-K","filed":"2023-02-28"},{"start":"2022-01-01","end":"2022-12-31","val":8101000,"accn":"0001326190-24-000010","fy":2023,"fp":"FY","form":"10-K","filed":"2024-03-27","frame":"CY2022"},{"start":"2023-01-01","end":"2023-03-31","val":2675000,"accn":"0001326190-23-000028","fy":2023,"fp":"Q1","form":"10-Q","filed":"2023-05-11"},{"start":"2023-01-01","end":"2023-03-31","val":2675000,"accn":"0001326190-24-000019","fy":2024,"fp":"Q1","form":"10-Q","filed":"2024-05-09","frame":"CY2023Q1"},{"start":"2023-01-01","end":"2023-06-30","val":5461000,"accn":"0001326190-23-000036","fy":2023,"fp":"Q2","form":"10-Q","filed":"2023-08-10"},{"start":"2023-01-01","end":"2023-06-30","val":5461000,"accn":"0001326190-24-000030","fy":2024,"fp":"Q2","form":"10-Q","filed":"2024-08-08"},{"start":"2023-01-01","end":"2023-09-30","val":8171000,"accn":"0001326190-23-000047","fy":2023,"fp":"Q3","form":"10-Q","filed":"2023-11-07"},{"start":"2023-01-01","end":"2023-09-30","val":8171000,"accn":"0001326190-24-000050","fy":2024,"fp":"Q3","form":"10-Q","filed":"2024-11-12"},{"start":"2023-01-01","end":"2023-12-31","val":10640000,"accn":"0001326190-24-000010","fy":2023,"fp":"FY","form":"10-K","filed":"2024-03-27"},{"start":"2023-01-01","end":"2023-12-31","val":10640000,"accn":"0001326190-25-000015","fy":2024,"fp":"FY","form":"10-K","filed":"2025-02-27","frame":"CY2023"},{"start":"2024-01-01","end":"2024-03-31","val":3650000,"accn":"0001326190-24-000019","fy":2024,"fp":"Q1","form":"10-Q","filed":"2024-05-09"},{"start":"2024-01-01","end":"2024-03-31","val":3650000,"accn":"0001326190-25-000034","fy":2025,"fp":"Q1","form":"10-Q","filed":"2025-05-13","frame":"CY2024Q1"},{"start":"2024-01-01","end":"2024-06-30","val":7961000,"accn":"0001326190-24-000030","fy":2024,"fp":"Q2","form":"10-Q","filed":"2024-08-08"},{"start":"2024-01-01","end":"2024-06-30","val":7961000,"accn":"0001326190-25-000040","fy":2025,"fp":"Q2","form":"10-Q","filed":"2025-08-12"},{"start":"2024-01-01","end":"2024-09-30","val":11039000,"accn":"0001326190-24-000050","fy":2024,"fp":"Q3","form":"10-Q","filed":"2024-11-12"},{"start":"2024-01-01","end":"2024-09-30","val":11039000,"accn":"0001326190-25-000064","fy":2025,"fp":"Q3","form":"10-Q","filed":"2025-11-06"},{"start":"2024-01-01","end":"2024-12-31","val":14393000,"accn":"0001326190-25-000015","fy":2024,"fp":"FY","form":"10-K","filed":"2025-02-27"},{"start":"2024-01-01","end":"2024-12-31","val":14393000,"accn":"0001326190-26-000018","fy":2025,"fp":"FY","form":"10-K","filed":"2026-03-06","frame":"CY2024"},{"start":"2025-01-01","end":"2025-03-31","val":4015000,"accn":"0001326190-25-000034","fy":2025,"fp":"Q1","form":"10-Q","filed":"2025-05-13"},{"start":"2025-01-01","end":"2025-03-31","val":4015000,"accn":"0001326190-26-000040","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-13","frame":"CY2025Q1"},{"start":"2025-01-01","end":"2025-06-30","val":7581000,"accn":"0001326190-25-000040","fy":2025,"fp":"Q2","form":"10-Q","filed":"2025-08-12"},{"start":"2025-01-01","end":"2025-09-30","val":11135000,"accn":"0001326190-25-000064","fy":2025,"fp":"Q3","form":"10-Q","filed":"2025-11-06"},{"start":"2025-01-01","end":"2025-12-31","val":16076000,"accn":"0001326190-26-000018","fy":2025,"fp":"FY","form":"10-K","filed":"2026-03-06","frame":"CY2025"},{"start":"2026-01-01","end":"2026-03-31","val":3378000,"accn":"0001326190-26-000040","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-13","frame":"CY2026Q1"}]}}