Description of common stock reserved for issuance under the stock based compensation plan.

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The time period over which the number of shares reserved for issuance under the stock based compensation plan will increase.

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Additional new shares authorized to be issued under the stock based compensation plan.

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Percentage increase in the number of authorized common shares for grant under the stock based compensation plan.

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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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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Unrecognized cost of unvested share-based compensation awards.

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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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Percentage of vesting of share-based compensation awards.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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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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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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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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No definition available.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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No definition available.

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Number of share options (or share units) exercised during the current period.

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Common stock - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended
Common stock - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 27, 2014	Mar. 12, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized	50,000,000us-gaap_CommonStockSharesAuthorized	139,266,037us-gaap_CommonStockSharesAuthorized			50,000,000us-gaap_CommonStockSharesAuthorized
Common stock, par value	$ 0.000001	$ 0.000001			$ 0.000001
Common stock, shares issued	10,695,108us-gaap_CommonStockSharesIssued	301,745us-gaap_CommonStockSharesIssued
Common stock, shares outstanding	10,695,108us-gaap_CommonStockSharesOutstanding	301,745us-gaap_CommonStockSharesOutstanding
Shares of common stock reserved for issuance description	Additionally, the number of shares of common stock reserved for issuance under the 2014 Plan will automatically increase on January 1 of each year for a period of up to 10 years, beginning on January 1, 2015 and ending on and including January 1, 2024, by 4% of the total number of shares of capital stock outstanding on December 31 of the preceding calendar year, or a lesser number of shares determined by the board of directors.
Shares of common stock reserved for issuance percentage	4.00%
Years of increase in shares of common stock reserved for issuance	10 years
Options available to be granted	598,812	736,333
Stock options granted	229,082
Stock options granted, exercise price per share	$ 10.13
Stock options, vesting period	5 years 6 months 29 days
Common stock issued upon exercise of options	86
Common stock issued upon exercise of options aggregate intrinsic value	$ 141
Expected dividend	0.00%	0.00%	0.00%
Weighted average grant-date fair value of stock options	$ 8.19	$ 0.40	$ 0.14
Stock-based compensation expense	854,188	349,321	351,322
Unrecognized stock-based compensation cost	$ 2,643,323
Unrecognized stock-based compensation cost, weighted-average period recognized	2 years 11 months 9 days
Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted	195,750
Stock options, vesting percentage	25.00%
Stock options, vesting period	1 year
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted	33,332
Stock options granted, exercise price per share	$ 11.00
Stock options, vesting period	3 years
Minimum [Member] \| Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted, exercise price per share	$ 6.73
Maximum [Member] \| Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted, exercise price per share	$ 10.10
Equity Incentive Plan 2006 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted				0
Equity Incentive Plan 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares of common stock that may be issued	1,423,416
Common stock, shares outstanding	756,279
Stock options, expiration period	10 years
Equity Incentive Plan 2006 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares outstanding	70,310