Warrants - Common Stock Warrants Issued in Pulmatrix Operating Private Placement - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2015 USD ($) $ / shares shares
Pulmatrix Operating [Member]
Class of Warrant or Right [Line Items]
Share price	$ 10.00
Average daily trading volume | shares	40,000
Pulmatrix Operating [Member] | Maximum [Member]
Class of Warrant or Right [Line Items]
Proceed from strategic license agreement | $	$ 20,000,000
Gross proceeds from issuance of securities | $	$ 20,000,000
Pulmatrix Operating [Member] | Sixty Consecutive Trading Days [Member]
Class of Warrant or Right [Line Items]
Share price	$ 12.50
Pulmatrix Operating [Member] | Minimum [Member]
Class of Warrant or Right [Line Items]
Percentage of weighted average price of common stock	150.00%
Pulmatrix Operating [Member] | Thirty Consecutive Trading Days [Member]
Class of Warrant or Right [Line Items]
Average daily trading volume | shares	80,000
Consideration for unexercised portion of the warrant per share of common stock	$ 0.001
Private Placement Warrants [Member]
Class of Warrant or Right [Line Items]
Warrants Outstanding | shares	3,190,030
Exercise price per share of warrants	$ 7.563