Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested options awarded to employees as compensation.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Net number of share options (or share units) granted during the period.

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Gross number of share options (or share units) granted during the period.

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Percentage of vesting of share-based compensation awards.

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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended	9 Months Ended
	Jun. 15, 2015	Aug. 31, 2015	Sep. 30, 2015	Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate shares of Common Stock that may be delivered under options outstanding			665,202	665,202
Number of options to purchase common stock, Granted				1,540,388
Unrecognized stock-based compensation expenses			$ 6,022	$ 6,022
Unrecognized stock-based compensation expense, period for recognition				3 years 3 months 18 days
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units, granted				339,426
Restricted stock units, options vested				180,090
Employee Stock Option [Member] \| Time Based Options vesting One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting term				48 equal monthly installments beginning on the monthly anniversary of the Vesting Start Date (as defined in the grant agreement).
Award vesting period				48 months
Employee Stock Option [Member] \| Time Based Options vesting Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting term				25% on the option grant date and the remainder in 36 equal monthly installments beginning in the month after the Vesting Start Date.
Award vesting period				36 months
Award vesting percentage				25.00%
Employee Stock Option [Member] \| Time Based Options vesting Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting term				25% at the one year anniversary of the Vesting Start Date and the remainder in 36 equal monthly installments beginning in the thirteenth month after the Vesting Start Date.
Award vesting period				36 months
Award vesting percentage				25.00%
Employee Stock Option [Member] \| Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options to purchase common stock, Granted				1,266,172
Employee Stock Option [Member] \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options to purchase common stock, Granted				117,779
Employee Stock Option [Member] \| Advisors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options to purchase common stock, Granted				156,437
Ruthigen [Member] \| Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units, granted				329,052
Restricted stock units, options vested	130,435		49,655
Stock-based compensation			$ 629	$ 2,384
Ruthigen [Member] \| Restricted Stock Units [Member] \| Other Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		2 years
Restricted stock units, granted		10,374
2013 Employee, Director and Consultant Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted				0
Shares available for future grant			611,035	611,035
2013 Employee, Director and Consultant Equity Incentive Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted				2,713,261
2013 Employee, Director and Consultant Equity Incentive Plan [Member] \| Ruthigen [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options to purchase common stock, Granted	24,400
2013 Employee, Director and Consultant Equity Incentive Plan [Member] \| Ruthigen [Member] \| Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units, options vested	67,732
Employee, Director, and Consultant Stock Plan (the "2003 Plan") [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted				0