Organization	9 Months Ended
Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	1. Organization On June 15, 2015 (the “Effective Time”), Pulmatrix Operating Company, Inc., a Delaware corporation previously known as Pulmatrix Inc. (“Pulmatrix Operating”), completed its merger with Ruthigen Merger Corp. (“Merger Sub”), a wholly owned subsidiary of Pulmatrix, Inc., a Delaware corporation previously known as Ruthigen, Inc. (“Ruthigen”), pursuant to the terms of the Agreement and Plan of Merger (the “Merger Agreement”), dated March 13, 2015, by and among Pulmatrix Operating, Merger Sub and Pulmatrix, Inc. (the “Merger”). Prior to the Merger, Ruthigen was a biopharmaceutical company focused on pioneering new hypochlorus acid, or HOCl, based therapies designed to improve patient outcomes and reduce healthcare costs associated with infections related to post-operative invasive procedures. Following the Merger, Pulmatrix, Inc. is a clinical stage biotechnology company focused on the discovery and development of a novel class of inhaled therapeutic products intended to prevent and treat respiratory diseases and infections that have significant unmet medical needs. Pulmatrix Operating’s proprietary dry powder delivery platform, the iSPERSE™ (inhaled Small Particles Easily Respirable and Emitted), is engineered to deliver small, dense particles with highly efficient dispersibility and delivery to the airways, which can be used with an array of dry powder inhaler technologies and can be formulated with a variety of drug substances. Pulmatrix, Inc. is developing a pipeline of iSPERSE-based therapeutic candidates targeted at prevention and treatment of a range of rare or orphan respiratory diseases and infections, including chronic obstructive pulmonary disease, cystic fibrosis and idiopathic pulmonary fibrosis. The term “Company” as used in these notes to the condensed consolidated financial statements refers to Pulmatrix Operating prior to the completion of the Merger and Pulmatrix, Inc. subsequent to the completion of the Merger.

Organization

9 Months Ended

Sep. 30, 2015

Organization, Consolidation and Presentation of Financial Statements [Abstract]

1. Organization

On June 15, 2015 (the “Effective Time”), Pulmatrix Operating Company, Inc., a Delaware corporation previously known as Pulmatrix Inc. (“Pulmatrix Operating”), completed its merger with Ruthigen Merger Corp. (“Merger Sub”), a wholly owned subsidiary of Pulmatrix, Inc., a Delaware corporation previously known as Ruthigen, Inc. (“Ruthigen”), pursuant to the terms of the Agreement and Plan of Merger (the “Merger Agreement”), dated March 13, 2015, by and among Pulmatrix Operating, Merger Sub and Pulmatrix, Inc. (the “Merger”).

Prior to the Merger, Ruthigen was a biopharmaceutical company focused on pioneering new hypochlorus acid, or HOCl, based therapies designed to improve patient outcomes and reduce healthcare costs associated with infections related to post-operative invasive procedures. Following the Merger, Pulmatrix, Inc. is a clinical stage biotechnology company focused on the discovery and development of a novel class of inhaled therapeutic products intended to prevent and treat respiratory diseases and infections that have significant unmet medical needs. Pulmatrix Operating’s proprietary dry powder delivery platform, the iSPERSE™ (inhaled Small Particles Easily Respirable and Emitted), is engineered to deliver small, dense particles with highly efficient dispersibility and delivery to the airways, which can be used with an array of dry powder inhaler technologies and can be formulated with a variety of drug substances. Pulmatrix, Inc. is developing a pipeline of iSPERSE-based therapeutic candidates targeted at prevention and treatment of a range of rare or orphan respiratory diseases and infections, including chronic obstructive pulmonary disease, cystic fibrosis and idiopathic pulmonary fibrosis.

The term “Company” as used in these notes to the condensed consolidated financial statements refers to Pulmatrix Operating prior to the completion of the Merger and Pulmatrix, Inc. subsequent to the completion of the Merger.