{"cik":1701108,"taxonomy":"us-gaap","tag":"ShareBasedCompensation","label":"Share-based Payment Arrangement, Noncash Expense","description":"Amount of noncash expense for share-based payment arrangement.","entityName":"SPERO THERAPEUTICS, INC.","units":{"USD":[{"start":"2015-01-01","end":"2015-12-31","val":21000,"accn":"0001564590-18-007402","fy":2017,"fp":"FY","form":"10-K","filed":"2018-04-02","frame":"CY2015"},{"start":"2016-01-01","end":"2016-09-30","val":117000,"accn":"0001193125-17-369457","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-12-14"},{"start":"2016-07-01","end":"2016-09-30","val":60000,"accn":"0001193125-17-369457","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-12-14","frame":"CY2016Q3"},{"start":"2016-01-01","end":"2016-12-31","val":180000,"accn":"0001564590-18-007402","fy":2017,"fp":"FY","form":"10-K","filed":"2018-04-02"},{"start":"2016-01-01","end":"2016-12-31","val":180000,"accn":"0001564590-19-007805","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-14","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":62000,"accn":"0001564590-18-012933","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":123000,"accn":"0001564590-18-021018","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-09"},{"start":"2017-04-01","end":"2017-06-30","val":61000,"accn":"0001564590-18-021018","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-09","frame":"CY2017Q2"},{"start":"2017-01-01","end":"2017-09-30","val":1054000,"accn":"0001193125-17-369457","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-12-14"},{"start":"2017-01-01","end":"2017-09-30","val":1054000,"accn":"0001564590-18-028526","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-07-01","end":"2017-09-30","val":931000,"accn":"0001193125-17-369457","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-12-14"},{"start":"2017-07-01","end":"2017-09-30","val":931000,"accn":"0001564590-18-028526","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q3"},{"start":"2017-01-01","end":"2017-12-31","val":1427000,"accn":"0001564590-18-007402","fy":2017,"fp":"FY","form":"10-K","filed":"2018-04-02"},{"start":"2017-01-01","end":"2017-12-31","val":1427000,"accn":"0001564590-19-007805","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-14","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":614000,"accn":"0001564590-18-012933","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"start":"2018-01-01","end":"2018-03-31","val":614000,"accn":"0001564590-19-017941","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-09","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":1275000,"accn":"0001564590-18-021018","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-09"},{"start":"2018-01-01","end":"2018-06-30","val":1275000,"accn":"0001564590-19-030746","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-08"},{"start":"2018-04-01","end":"2018-06-30","val":661000,"accn":"0001564590-18-021018","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-09"},{"start":"2018-04-01","end":"2018-06-30","val":661000,"accn":"0001564590-19-030746","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-08","frame":"CY2018Q2"},{"start":"2018-01-01","end":"2018-09-30","val":1980000,"accn":"0001564590-18-028526","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2018-01-01","end":"2018-09-30","val":1980000,"accn":"0001564590-19-039770","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-04"},{"start":"2018-07-01","end":"2018-09-30","val":705000,"accn":"0001564590-18-028526","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2018-07-01","end":"2018-09-30","val":705000,"accn":"0001564590-19-039770","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-04","frame":"CY2018Q3"},{"start":"2018-01-01","end":"2018-12-31","val":2749000,"accn":"0001564590-19-007805","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-14"},{"start":"2018-01-01","end":"2018-12-31","val":2749000,"accn":"0001564590-20-010998","fy":2019,"fp":"FY","form":"10-K","filed":"2020-03-16","frame":"CY2018"},{"start":"2019-01-01","end":"2019-03-31","val":933000,"accn":"0001564590-19-017941","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-09"},{"start":"2019-01-01","end":"2019-03-31","val":933000,"accn":"0001564590-20-023243","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-05-08","frame":"CY2019Q1"},{"start":"2019-01-01","end":"2019-06-30","val":1866000,"accn":"0001564590-19-030746","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-08"},{"start":"2019-01-01","end":"2019-06-30","val":1866000,"accn":"0001564590-20-037710","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-08-06"},{"start":"2019-04-01","end":"2019-06-30","val":933000,"accn":"0001564590-19-030746","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-08"},{"start":"2019-04-01","end":"2019-06-30","val":933000,"accn":"0001564590-20-037710","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-08-06","frame":"CY2019Q2"},{"start":"2019-01-01","end":"2019-09-30","val":2847000,"accn":"0001564590-19-039770","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-04"},{"start":"2019-01-01","end":"2019-09-30","val":2847000,"accn":"0001564590-20-051279","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-05"},{"start":"2019-07-01","end":"2019-09-30","val":981000,"accn":"0001564590-19-039770","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-04"},{"start":"2019-07-01","end":"2019-09-30","val":981000,"accn":"0001564590-20-051279","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-05","frame":"CY2019Q3"},{"start":"2019-01-01","end":"2019-12-31","val":3776000,"accn":"0001564590-20-010998","fy":2019,"fp":"FY","form":"10-K","filed":"2020-03-16"},{"start":"2019-01-01","end":"2019-12-31","val":3776000,"accn":"0001564590-21-012514","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-11","frame":"CY2019"},{"start":"2020-01-01","end":"2020-03-31","val":1110000,"accn":"0001564590-20-023243","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-05-08"},{"start":"2020-01-01","end":"2020-03-31","val":1110000,"accn":"0001564590-21-024932","fy":2021,"fp":"Q1","form":"10-Q","filed":"2021-05-06","frame":"CY2020Q1"},{"start":"2020-01-01","end":"2020-06-30","val":2324000,"accn":"0001564590-20-037710","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-08-06"},{"start":"2020-01-01","end":"2020-06-30","val":2324000,"accn":"0000950170-21-000924","fy":2021,"fp":"Q2","form":"10-Q","filed":"2021-08-05"},{"start":"2020-04-01","end":"2020-06-30","val":1214000,"accn":"0001564590-20-037710","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-08-06"},{"start":"2020-04-01","end":"2020-06-30","val":1214000,"accn":"0000950170-21-000924","fy":2021,"fp":"Q2","form":"10-Q","filed":"2021-08-05","frame":"CY2020Q2"},{"start":"2020-01-01","end":"2020-09-30","val":3523000,"accn":"0001564590-20-051279","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-05"},{"start":"2020-01-01","end":"2020-09-30","val":3523000,"accn":"0000950170-21-004064","fy":2021,"fp":"Q3","form":"10-Q","filed":"2021-11-10"},{"start":"2020-07-01","end":"2020-09-30","val":1199000,"accn":"0001564590-20-051279","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-05"},{"start":"2020-07-01","end":"2020-09-30","val":1199000,"accn":"0000950170-21-004064","fy":2021,"fp":"Q3","form":"10-Q","filed":"2021-11-10","frame":"CY2020Q3"},{"start":"2020-01-01","end":"2020-12-31","val":4888000,"accn":"0001564590-21-012514","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-11"},{"start":"2020-01-01","end":"2020-12-31","val":4888000,"accn":"0000950170-22-005194","fy":2021,"fp":"FY","form":"10-K","filed":"2022-03-31","frame":"CY2020"},{"start":"2021-01-01","end":"2021-03-31","val":2009000,"accn":"0001564590-21-024932","fy":2021,"fp":"Q1","form":"10-Q","filed":"2021-05-06"},{"start":"2021-01-01","end":"2021-03-31","val":2009000,"accn":"0000950170-22-010064","fy":2022,"fp":"Q1","form":"10-Q","filed":"2022-05-16","frame":"CY2021Q1"},{"start":"2021-01-01","end":"2021-06-30","val":4172000,"accn":"0000950170-21-000924","fy":2021,"fp":"Q2","form":"10-Q","filed":"2021-08-05"},{"start":"2021-01-01","end":"2021-06-30","val":4172000,"accn":"0000950170-22-016443","fy":2022,"fp":"Q2","form":"10-Q","filed":"2022-08-10"},{"start":"2021-04-01","end":"2021-06-30","val":2163000,"accn":"0000950170-21-000924","fy":2021,"fp":"Q2","form":"10-Q","filed":"2021-08-05"},{"start":"2021-04-01","end":"2021-06-30","val":2163000,"accn":"0000950170-22-016443","fy":2022,"fp":"Q2","form":"10-Q","filed":"2022-08-10","frame":"CY2021Q2"},{"start":"2021-01-01","end":"2021-09-30","val":6502000,"accn":"0000950170-21-004064","fy":2021,"fp":"Q3","form":"10-Q","filed":"2021-11-10"},{"start":"2021-01-01","end":"2021-09-30","val":6502000,"accn":"0000950170-22-024971","fy":2022,"fp":"Q3","form":"10-Q","filed":"2022-11-14"},{"start":"2021-07-01","end":"2021-09-30","val":2330000,"accn":"0000950170-21-004064","fy":2021,"fp":"Q3","form":"10-Q","filed":"2021-11-10"},{"start":"2021-07-01","end":"2021-09-30","val":2330000,"accn":"0000950170-22-024971","fy":2022,"fp":"Q3","form":"10-Q","filed":"2022-11-14","frame":"CY2021Q3"},{"start":"2021-01-01","end":"2021-12-31","val":9430000,"accn":"0000950170-22-005194","fy":2021,"fp":"FY","form":"10-K","filed":"2022-03-31"},{"start":"2021-01-01","end":"2021-12-31","val":9430000,"accn":"0000950170-23-010921","fy":2022,"fp":"FY","form":"10-K","filed":"2023-03-30","frame":"CY2021"},{"start":"2022-01-01","end":"2022-03-31","val":3203000,"accn":"0000950170-22-010064","fy":2022,"fp":"Q1","form":"10-Q","filed":"2022-05-16"},{"start":"2022-01-01","end":"2022-03-31","val":3203000,"accn":"0000950170-23-021187","fy":2023,"fp":"Q1","form":"10-Q","filed":"2023-05-11","frame":"CY2022Q1"},{"start":"2022-01-01","end":"2022-06-30","val":4520000,"accn":"0000950170-22-016443","fy":2022,"fp":"Q2","form":"10-Q","filed":"2022-08-10"},{"start":"2022-01-01","end":"2022-06-30","val":4520000,"accn":"0000950170-23-041314","fy":2023,"fp":"Q2","form":"10-Q","filed":"2023-08-10"},{"start":"2022-04-01","end":"2022-06-30","val":1317000,"accn":"0000950170-22-016443","fy":2022,"fp":"Q2","form":"10-Q","filed":"2022-08-10"},{"start":"2022-04-01","end":"2022-06-30","val":1317000,"accn":"0000950170-23-041314","fy":2023,"fp":"Q2","form":"10-Q","filed":"2023-08-10","frame":"CY2022Q2"},{"start":"2022-01-01","end":"2022-09-30","val":6626000,"accn":"0000950170-22-024971","fy":2022,"fp":"Q3","form":"10-Q","filed":"2022-11-14"},{"start":"2022-01-01","end":"2022-09-30","val":6626000,"accn":"0000950170-23-062897","fy":2023,"fp":"Q3","form":"10-Q","filed":"2023-11-13"},{"start":"2022-07-01","end":"2022-09-30","val":2106000,"accn":"0000950170-22-024971","fy":2022,"fp":"Q3","form":"10-Q","filed":"2022-11-14"},{"start":"2022-07-01","end":"2022-09-30","val":2106000,"accn":"0000950170-23-062897","fy":2023,"fp":"Q3","form":"10-Q","filed":"2023-11-13","frame":"CY2022Q3"},{"start":"2022-01-01","end":"2022-12-31","val":9123000,"accn":"0000950170-23-010921","fy":2022,"fp":"FY","form":"10-K","filed":"2023-03-30"},{"start":"2022-01-01","end":"2022-12-31","val":9123000,"accn":"0000950170-24-030767","fy":2023,"fp":"FY","form":"10-K","filed":"2024-03-13","frame":"CY2022"},{"start":"2023-01-01","end":"2023-03-31","val":2170000,"accn":"0000950170-23-021187","fy":2023,"fp":"Q1","form":"10-Q","filed":"2023-05-11"},{"start":"2023-01-01","end":"2023-03-31","val":2170000,"accn":"0000950170-24-060400","fy":2024,"fp":"Q1","form":"10-Q","filed":"2024-05-15","frame":"CY2023Q1"},{"start":"2023-01-01","end":"2023-06-30","val":4027000,"accn":"0000950170-23-041314","fy":2023,"fp":"Q2","form":"10-Q","filed":"2023-08-10"},{"start":"2023-01-01","end":"2023-06-30","val":4027000,"accn":"0000950170-24-090782","fy":2024,"fp":"Q2","form":"10-Q","filed":"2024-08-05"},{"start":"2023-04-01","end":"2023-06-30","val":1857000,"accn":"0000950170-23-041314","fy":2023,"fp":"Q2","form":"10-Q","filed":"2023-08-10"},{"start":"2023-04-01","end":"2023-06-30","val":1857000,"accn":"0000950170-24-090782","fy":2024,"fp":"Q2","form":"10-Q","filed":"2024-08-05","frame":"CY2023Q2"},{"start":"2023-01-01","end":"2023-09-30","val":5935000,"accn":"0000950170-23-062897","fy":2023,"fp":"Q3","form":"10-Q","filed":"2023-11-13"},{"start":"2023-01-01","end":"2023-09-30","val":5935000,"accn":"0000950170-24-127016","fy":2024,"fp":"Q3","form":"10-Q","filed":"2024-11-14"},{"start":"2023-07-01","end":"2023-09-30","val":1908000,"accn":"0000950170-23-062897","fy":2023,"fp":"Q3","form":"10-Q","filed":"2023-11-13"},{"start":"2023-07-01","end":"2023-09-30","val":1908000,"accn":"0000950170-24-127016","fy":2024,"fp":"Q3","form":"10-Q","filed":"2024-11-14","frame":"CY2023Q3"},{"start":"2023-01-01","end":"2023-12-31","val":7932000,"accn":"0000950170-24-030767","fy":2023,"fp":"FY","form":"10-K","filed":"2024-03-13"},{"start":"2023-01-01","end":"2023-12-31","val":7932000,"accn":"0000950170-25-046125","fy":2024,"fp":"FY","form":"10-K","filed":"2025-03-27","frame":"CY2023"},{"start":"2024-01-01","end":"2024-03-31","val":2023000,"accn":"0000950170-24-060400","fy":2024,"fp":"Q1","form":"10-Q","filed":"2024-05-15"},{"start":"2024-01-01","end":"2024-03-31","val":2023000,"accn":"0000950170-25-070380","fy":2025,"fp":"Q1","form":"10-Q","filed":"2025-05-13","frame":"CY2024Q1"},{"start":"2024-01-01","end":"2024-06-30","val":4136000,"accn":"0000950170-24-090782","fy":2024,"fp":"Q2","form":"10-Q","filed":"2024-08-05"},{"start":"2024-01-01","end":"2024-06-30","val":4136000,"accn":"0000950170-25-107388","fy":2025,"fp":"Q2","form":"10-Q","filed":"2025-08-12"},{"start":"2024-04-01","end":"2024-06-30","val":2113000,"accn":"0000950170-24-090782","fy":2024,"fp":"Q2","form":"10-Q","filed":"2024-08-05"},{"start":"2024-04-01","end":"2024-06-30","val":2113000,"accn":"0000950170-25-107388","fy":2025,"fp":"Q2","form":"10-Q","filed":"2025-08-12","frame":"CY2024Q2"},{"start":"2024-01-01","end":"2024-09-30","val":6290000,"accn":"0000950170-24-127016","fy":2024,"fp":"Q3","form":"10-Q","filed":"2024-11-14"},{"start":"2024-01-01","end":"2024-09-30","val":6290000,"accn":"0001193125-25-280174","fy":2025,"fp":"Q3","form":"10-Q","filed":"2025-11-13"},{"start":"2024-07-01","end":"2024-09-30","val":2154000,"accn":"0000950170-24-127016","fy":2024,"fp":"Q3","form":"10-Q","filed":"2024-11-14"},{"start":"2024-07-01","end":"2024-09-30","val":2154000,"accn":"0001193125-25-280174","fy":2025,"fp":"Q3","form":"10-Q","filed":"2025-11-13","frame":"CY2024Q3"},{"start":"2024-01-01","end":"2024-12-31","val":7793000,"accn":"0000950170-25-046125","fy":2024,"fp":"FY","form":"10-K","filed":"2025-03-27"},{"start":"2024-01-01","end":"2024-12-31","val":7793000,"accn":"0001193125-26-126192","fy":2025,"fp":"FY","form":"10-K","filed":"2026-03-26","frame":"CY2024"},{"start":"2025-01-01","end":"2025-03-31","val":1556000,"accn":"0000950170-25-070380","fy":2025,"fp":"Q1","form":"10-Q","filed":"2025-05-13"},{"start":"2025-01-01","end":"2025-03-31","val":1556000,"accn":"0001193125-26-221591","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-13","frame":"CY2025Q1"},{"start":"2025-01-01","end":"2025-06-30","val":2270000,"accn":"0000950170-25-107388","fy":2025,"fp":"Q2","form":"10-Q","filed":"2025-08-12"},{"start":"2025-01-01","end":"2025-06-30","val":2270000,"accn":"0001193125-26-346795","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-08-12"},{"start":"2025-04-01","end":"2025-06-30","val":714000,"accn":"0000950170-25-107388","fy":2025,"fp":"Q2","form":"10-Q","filed":"2025-08-12"},{"start":"2025-04-01","end":"2025-06-30","val":714000,"accn":"0001193125-26-346795","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-08-12","frame":"CY2025Q2"},{"start":"2025-01-01","end":"2025-09-30","val":3318000,"accn":"0001193125-25-280174","fy":2025,"fp":"Q3","form":"10-Q","filed":"2025-11-13"},{"start":"2025-07-01","end":"2025-09-30","val":1048000,"accn":"0001193125-25-280174","fy":2025,"fp":"Q3","form":"10-Q","filed":"2025-11-13","frame":"CY2025Q3"},{"start":"2025-01-01","end":"2025-12-31","val":4325000,"accn":"0001193125-26-126192","fy":2025,"fp":"FY","form":"10-K","filed":"2026-03-26","frame":"CY2025"},{"start":"2026-01-01","end":"2026-03-31","val":1114000,"accn":"0001193125-26-221591","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-13","frame":"CY2026Q1"},{"start":"2026-01-01","end":"2026-06-30","val":1936000,"accn":"0001193125-26-346795","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-08-12"},{"start":"2026-04-01","end":"2026-06-30","val":822000,"accn":"0001193125-26-346795","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-08-12","frame":"CY2026Q2"}]}}