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Non employee director received restricted stock award value.

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Percentage of shares granted.

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Share based compensation expense payments rolling year three.

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Share based compensation expense payments rolling year two.

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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 share-based awards, other than options, awarded to employees as compensation.

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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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Discount rate from fair value on purchase date that participants pay for shares.

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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 non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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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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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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- Definition

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

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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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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Share-Based Compensation - Additional Information (Detail) - USD ($)			1 Months Ended											12 Months Ended
	May 17, 2017	Aug. 01, 2016	Jun. 30, 2018	May 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Dec. 31, 2017	Apr. 29, 2017	Mar. 31, 2017	Feb. 28, 2017	May 31, 2016	Mar. 31, 2016	May 31, 2015	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017	Apr. 28, 2018	Apr. 30, 2016	Jan. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding						745,270								771,145	745,270	685,456			657,936
Number of options granted														196,000	187,189	122,000
Award Vesting period			3 years
Options granted weighted-average fair value per share														$ 7.43	$ 4.79	$ 3.22
Aggregate intrinsic value of options exercised														$ 1,100,000	$ 400,000	$ 600,000
Reservation of shares under Stock Purchase Plan														247,500
2015 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding														202,450
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Stock Purchase Plan discount rate														15.00%
2007 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding														417,695
2018 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for grant under the Plan														650,000
Number of shares outstanding														151,000
Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted									50,000			50,000
Certain Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted				40,000							37,000
Chief Financial Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted		5,000
Certain Other Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted								52,189		52,189
Non-Employee Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granting percentage of shares														25.00%
Director compensation amount, fiscal 2017														$ 55,000
Director compensation amount, fiscal 2018														65,000
Director compensation amount, fiscal 2019														$ 75,000
Non-Employee Director [Member] \| 2015 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option expiration period														10 years
Number of options granted	30,000													5,000
Chairman of Board [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-employee director received restricted stock award value														$ 6,000
Chairs of Audit and Compensation Committees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-employee director received restricted stock award value														4,000
Board [Member] \| Nonqualified Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted							5,000
New Chief Executive Officer [Member] \| Nonqualified Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted						50,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted			126,000
Unrecognized compensation expense related to options														$ 1,500,000
Unrecognized compensation expense to be recognized, Weighted average period														2 years 3 months 18 days
Aggregate intrinsic value of option exercised														$ 3,000,000
Aggregate intrinsic value of the options outstanding														$ 4,400,000
2014 Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense to be recognized, Weighted average period														1 year 10 months 24 days
Unrecognized compensation expense related to RSUs and RSAs														$ 1,400,000
2014 Restricted Stock Units (RSUs) [Member] \| Board [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted							675
2014 Restricted Stock Units (RSUs) [Member] \| New Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted						15,000
RSA [Member] \| 2015 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted														50,585
RSA [Member] \| 2007 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted														2,148
RSA [Member] \| 2018 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted														80,934
RSA [Member] \| Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted												4,030
Equity Incentive Plan [Member] \| Non-Employee Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options grant to each non-employee director														26,515	28,062	11,379
Time Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted			44,275										80,000
Performance Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted													155,000
Performance Based Restricted Stock Units RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted			38,000
Number of vesting shares								9,025									33,638	15,810
Non Qualified Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted			25,000
Non Qualified Options [Member] \| Newly Elected Member of Board of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted					5,000