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

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Equity Transactions And Share Based Compensation [Line Items]

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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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Share Based Compensation Arrangement By Share Based Payment Award Vesting Period From Grant Date

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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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Total number of common and preferred stock shares the Company is authorized to issue.

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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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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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

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

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Stockholders' equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Jan. 27, 2014	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Equity Transactions And Share Based Compensation [Line Items]
Total number of shares authorized		55,000,000		55,000,000
Common stock, shares authorized		50,000,000		50,000,000		50,000,000
Common stock, par value		$ 0.000001		$ 0.000001		$ 0.000001
Preferred stock, shares authorized		5,000,000		5,000,000
Preferred stock, par value		$ 0.000001		$ 0.000001
Common stock, shares issued		17,212,637		17,212,637		17,211,986
Common stock, shares outstanding		17,212,637		17,212,637		17,211,986
Preferred stock, shares issued		0		0		0
Preferred stock, shares outstanding		0		0		0
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 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
Stock options granted				476,460
Stock options granted, exercise price per share				$ 8.19
Common stock issued upon exercise of options		651		651
Stock-based compensation expense		$ 482	$ 455	$ 915	$ 721
Unrecognized stock-based compensation cost		$ 4,321	$ 4,166	$ 4,321	$ 4,166
Unrecognized stock-based compensation cost, weighted-average period recognized				2 years 11 months 16 days	2 years 11 months 12 days
Employees [Member]
Equity Transactions And Share Based Compensation [Line Items]
Stock options granted				438,960
Employees [Member] \| One Year after the Beginning of the Vesting Period [Member]
Equity Transactions And Share Based Compensation [Line Items]
Stock options, vesting percentage				25.00%
Employees [Member] \| Minimum [Member]
Equity Transactions And Share Based Compensation [Line Items]
Stock options granted, exercise price per share				$ 7.73
Employees [Member] \| Maximum [Member]
Equity Transactions And Share Based Compensation [Line Items]
Stock options granted, exercise price per share				$ 10.09
Employees [Member] \| Condition (i) [Member]
Equity Transactions And Share Based Compensation [Line Items]
Stock options, vesting period				1 year
Employees [Member] \| Condition (ii) [Member]
Equity Transactions And Share Based Compensation [Line Items]
Stock options, vesting period				3 years
Director [Member]
Equity Transactions And Share Based Compensation [Line Items]
Stock options granted				37,500
Stock options granted, exercise price per share				$ 7.73
Stock options, vesting period				1 year
Equity Incentive Plan 2006 [Member]
Equity Transactions And Share Based Compensation [Line Items]
Stock options granted	0
Equity Incentive Plan 2014 [Member]
Equity Transactions And Share Based Compensation [Line Items]
Maximum number of shares of common stock that may be issued		1,977,225		1,977,225
Stock options, expiration period				10 years