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Warrants - Preferred Stock Warrants Issued With Notes Payable to Stockholders - Additional Information (Detail) - Preferred Stock Warrants [Member]
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
$ / shares
shares
Sep. 30, 2014
USD ($)
Dec. 31, 2014
shares
Class of Warrant or Right [Line Items]          
Number of shares available for purchase of common stock in warrants | shares 0   0   14,544,247
Other income from change in fair value of warrant liability | $ $ 0   $ 1,309 $ 620  
Other expense from change in fair value of warrant liability | $   $ (655)      
Pulmatrix Operating [Member]          
Class of Warrant or Right [Line Items]          
Factor used for determining warrant exercisable 0.25   0.25    
Warrants term     10 years    
Number of shares available for purchase of common stock in warrants | shares 0   0    
Pulmatrix Operating [Member] | Series B Preferred Stock [Member]          
Class of Warrant or Right [Line Items]          
Factor used for determining warrant exercisable 0.25   0.25    
Conversion price for warrants     $ 0.50    
Exercise price per share of warrants $ 0.50   $ 0.50