{"cik":1113148,"taxonomy":"dei","tag":"EntityCommonStockSharesOutstanding","label":"Entity Common Stock, Shares Outstanding","description":"Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report. Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument.","entityName":"Infinity Pharmaceuticals, Inc.","units":{"shares":[{"end":"2011-06-30","val":26602949,"accn":"0001193125-11-216464","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-09","frame":"CY2011Q2I"},{"end":"2011-09-30","val":26678793,"accn":"0001193125-11-302185","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-08","frame":"CY2011Q3I"},{"end":"2012-02-29","val":26760058,"accn":"0001193125-12-111977","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-13"},{"end":"2012-03-31","val":26888645,"accn":"0001193125-12-218293","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-08","frame":"CY2012Q1I"},{"end":"2012-06-30","val":27269697,"accn":"0001193125-12-339352","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-07","frame":"CY2012Q2I"},{"end":"2012-09-30","val":39480298,"accn":"0001193125-12-453167","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-06","frame":"CY2012Q3I"},{"end":"2013-02-28","val":47644646,"accn":"0001193125-13-091650","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-05"},{"end":"2013-03-31","val":47828899,"accn":"0001193125-13-204326","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-07","frame":"CY2013Q1I"},{"end":"2013-06-30","val":47982997,"accn":"0001193125-13-325531","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-08","frame":"CY2013Q2I"},{"end":"2013-09-30","val":48086619,"accn":"0001193125-13-432729","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2014-02-14","val":48281015,"accn":"0001193125-14-066107","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-25","frame":"CY2013Q4I"},{"end":"2014-04-21","val":48542517,"accn":"0001193125-14-184776","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-06","frame":"CY2014Q1I"},{"end":"2014-06-30","val":48586344,"accn":"0001193125-14-303968","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-11","frame":"CY2014Q2I"},{"end":"2014-11-03","val":48766883,"accn":"0001193125-14-405976","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-10","frame":"CY2014Q3I"},{"end":"2015-02-18","val":48920286,"accn":"0001193125-15-060050","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24"},{"end":"2015-04-30","val":49042486,"accn":"0001193125-15-173304","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-06","frame":"CY2015Q1I"},{"end":"2015-07-31","val":49188464,"accn":"0001193125-15-279968","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-06","frame":"CY2015Q2I"},{"end":"2015-10-30","val":49230508,"accn":"0001193125-15-368134","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-05","frame":"CY2015Q3I"},{"end":"2016-02-16","val":49339647,"accn":"0001193125-16-473445","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-23"},{"end":"2016-04-29","val":49447019,"accn":"0001113148-16-000007","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-04","frame":"CY2016Q1I"},{"end":"2016-07-29","val":49587998,"accn":"0001113148-16-000009","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-09","frame":"CY2016Q2I"},{"end":"2016-10-31","val":49729719,"accn":"0001113148-16-000011","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-09","frame":"CY2016Q3I"},{"end":"2017-03-01","val":50426205,"accn":"0001113148-17-000003","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-14"},{"end":"2017-04-28","val":50443128,"accn":"0001113148-17-000006","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-09","frame":"CY2017Q1I"},{"end":"2017-07-28","val":50689512,"accn":"0001113148-17-000010","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-03","frame":"CY2017Q2I"},{"end":"2017-11-02","val":50711433,"accn":"0001113148-17-000013","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-07","frame":"CY2017Q3I"},{"end":"2018-03-01","val":51961800,"accn":"0001113148-18-000004","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-15","frame":"CY2018Q1I"},{"end":"2018-05-01","val":56069632,"accn":"0001113148-18-000007","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-08"},{"end":"2018-08-01","val":56850548,"accn":"0001113148-18-000010","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-07","frame":"CY2018Q2I"},{"end":"2018-10-31","val":56866615,"accn":"0001113148-18-000013","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-05","frame":"CY2018Q3I"},{"end":"2019-03-08","val":56925528,"accn":"0001113148-19-000002","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-14","frame":"CY2019Q1I"},{"end":"2019-04-30","val":56925528,"accn":"0001113148-19-000005","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-07"},{"end":"2019-07-23","val":57026782,"accn":"0001113148-19-000008","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-07-30","frame":"CY2019Q2I"},{"end":"2019-10-21","val":57028970,"accn":"0001113148-19-000013","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-10-30","frame":"CY2019Q3I"},{"end":"2020-02-20","val":57433598,"accn":"0001113148-20-000004","fy":2019,"fp":"FY","form":"10-K","filed":"2020-03-03"},{"end":"2020-05-06","val":57433598,"accn":"0001113148-20-000016","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-05-11","frame":"CY2020Q1I"},{"end":"2020-07-23","val":58870651,"accn":"0001113148-20-000028","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-07-30","frame":"CY2020Q2I"},{"end":"2020-11-03","val":64206758,"accn":"0001113148-20-000039","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-09","frame":"CY2020Q3I"},{"end":"2021-03-05","val":88639741,"accn":"0001113148-21-000007","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-16","frame":"CY2021Q1I"},{"end":"2021-05-06","val":88647241,"accn":"0001113148-21-000013","fy":2021,"fp":"Q1","form":"10-Q","filed":"2021-05-13"},{"end":"2021-07-20","val":88719539,"accn":"0001113148-21-000019","fy":2021,"fp":"Q2","form":"10-Q","filed":"2021-07-27","frame":"CY2021Q2I"},{"end":"2021-10-26","val":89015398,"accn":"0001113148-21-000023","fy":2021,"fp":"Q3","form":"10-Q","filed":"2021-11-02","frame":"CY2021Q3I"},{"end":"2022-03-25","val":89155311,"accn":"0001113148-22-000007","fy":2021,"fp":"FY","form":"10-K","filed":"2022-03-29","frame":"CY2022Q1I"},{"end":"2022-04-26","val":89155311,"accn":"0001113148-22-000012","fy":2022,"fp":"Q1","form":"10-Q","filed":"2022-05-03"},{"end":"2022-08-02","val":89277873,"accn":"0001113148-22-000018","fy":2022,"fp":"Q2","form":"10-Q","filed":"2022-08-09","frame":"CY2022Q2I"},{"end":"2022-11-07","val":89345581,"accn":"0001113148-22-000022","fy":2022,"fp":"Q3","form":"10-Q","filed":"2022-11-14","frame":"CY2022Q3I"},{"end":"2023-03-21","val":89422138,"accn":"0001113148-23-000003","fy":2022,"fp":"FY","form":"10-K","filed":"2023-03-28","frame":"CY2023Q1I"},{"end":"2023-05-02","val":89904805,"accn":"0001113148-23-000006","fy":2023,"fp":"Q1","form":"10-Q","filed":"2023-05-09"},{"end":"2023-08-03","val":90761081,"accn":"0001113148-23-000009","fy":2023,"fp":"Q2","form":"10-Q","filed":"2023-08-10","frame":"CY2023Q2I"}]}}