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Merger - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 15, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Business Acquisition [Line Items] |  |  |  |  |
Number of options, Granted |  |  |  | 1,540,388 |
Deferred tax liability |  | $ 2,959,000 |  | $ 2,959,000 |
In-process research and development |  | 7,534,000 |  | $ 7,534,000 |
Effective tax rate |  |  |  | 39.28% |
Operating losses |  | 4,661,000 | $ 2,594,000 | $ 18,724,000 | $ 7,453,000
Loss on conversion of convertible notes |  |  |  | $ (1,170,000) |
Restricted Stock Units [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Restricted stock units, options vested |  |  |  | 180,090 |
2015 Bridge Notes [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Common stock issued upon conversion of preferred stock and notes | 664,559 |  |  |  |
Loss on conversion of convertible notes | $ (1,170,000) | 0 |  | $ (1,170,000) |
Pulmatrix Operating [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Merger completion date | Jun. 15, 2015 |  |  |  |
Common stock exchange | 0.1481871240 |  |  |  |
Shares issued upon conversion of convertible preferred stock | 70,105,854 |  |  |  |
Debt instrument conversion, shares of common stock | 86,118,402 |  |  |  |
Pulmatrix Operating [Member] | Oculus Innovative Sciences Inc [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Minimum sale price of acquired In-process research and development assets under license agreement | $ 1,000,000 |  |  |  |
Minimum sale price of acquired In-process research and development assets to be shared with related party | $ 10,000,000 |  |  |  |
Percentage of sales consideration of acquired In-process research and development assets payable to related party | 10.00% |  |  |  |
Pulmatrix Operating [Member] | Common Stock [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Common stock issued upon conversion of preferred stock and notes | 4,155,539 |  |  |  |
Pulmatrix Operating [Member] | Convertible Notes [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Common stock issued upon conversion of preferred stock and notes | 5,104,655 |  |  |  |
Pulmatrix Operating [Member] | 2015 Bridge Notes [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Common stock issued upon conversion of preferred stock and notes | 664,559 |  |  |  |
Business acquisition, principal amount of notes assumed | $ 4,500,000 |  |  |  |
Ruthigen [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Merger agreement description |  |  |  | All Pulmatrix Operating stock options granted under the Pulmatrix Operating stock option plans (whether or not then exercisable) that were outstanding at the Effective Time converted into options to purchase Company Common Stock. After the Effective Time, all outstanding and unexercised Pulmatrix Operating stock options assumed by the Company may be exercised solely for shares of Company Common Stock. The number of shares of Company Common Stock subject to each Pulmatrix Operating stock option assumed by the Company was determined by multiplying (a) the number of shares of Pulmatrix Operating common stock that were subject to such Pulmatrix Operating stock option, as in effect immediately prior to the Effective Time, by (b) the Exchange Ratio, as defined in the merger agreement, and rounding the resulting number down to the nearest whole number of shares of Company Common Stock. The per share exercise price for the Company Common Stock issuable upon exercise of each Pulmatrix Operating stock option assumed by the Company was determined by dividing (a) the per share exercise price of Pulmatrix Operating common stock subject to such Pulmatrix Operating stock option, as in effect immediately prior to the Effective Time, by (b) the Exchange Ratio and rounding the resulting exercise price up to the nearest whole cent. |
Purchase price allocation description |  |  |  | The purchase price allocation has been prepared on a preliminary basis and is subject to change as additional information becomes available concerning the fair value and tax basis of the assets acquired and the liabilities assumed. Any adjustments to the purchase price allocation will be made as soon as practicable but no later than one year from June 15, 2015, the acquisition date. |
Adjustments to purchase price allocation period |  |  |  | No later than one year |
Goodwill description |  |  |  | Goodwill is calculated as the difference between the acquisition-date fair value of the consideration transferred and the fair values of the assets acquired and liabilities assumed. The goodwill is not expected to be deductible for income tax purposes. Goodwill is recorded as an indefinite-lived asset and is not amortized but tested for impairment on an annual basis or when indications of impairment exist. |
Deferred tax liability | 2,959,000 |  |  |  |
In-process research and development | $ 7,534,000 | 7,534,000 |  | $ 7,534,000 |
Operating losses |  | 108,000 |  | 1,373,000 |
Transaction costs in connection with merger |  |  |  | 6,863,000 |
Transaction costs in connection with merger |  | $ 9,956,000 |  | 9,956,000 |
Stock-based compensation expense related to acceleration of vesting |  |  |  | 901,000 |
Expenses related to stay bonuses |  |  |  | 995,000 |
Other expense related to change in fair value of liability classified |  |  |  | 2,291,000 |
Other income related to change in fair value of liability classified |  |  |  | 1,309,000 | 1,275,000
Ruthigen [Member] | IPR&D [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Discounted cash flow analysis rate | 26.60% |  |  |  |
Ruthigen [Member] | Restricted Stock Units [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Restricted stock units, options vested | 130,435 | 49,655 |  |  |
Ruthigen [Member] | 2015 Bridge Notes [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loss on conversion of convertible notes |  |  |  | 1,170,000 |
Interest expense |  |  |  | $ 477,000 | $ 6,868,000
Ruthigen [Member] | 2013 Employee, Director and Consultant Equity Incentive Plan [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of options, Granted | 24,400 |  |  |  |
Ruthigen [Member] | 2013 Employee, Director and Consultant Equity Incentive Plan [Member] | Restricted Stock Units [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Restricted stock units, options vested | 67,732 |  |  |  |

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