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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 |  |

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- Definition Conversion price for warrants. + References No definition available. + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The aggregate amount of other expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating expense recognized during the period. Such amounts may include: (a) unusual costs, (b) loss on foreign exchange transactions, (c) losses on securities (net of profits), and (d) miscellaneous other expense items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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