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

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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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Share-Based Compensation - Additional Information (Detail)				1 Months Ended							3 Months Ended		6 Months Ended
	May 17, 2017 shares	Aug. 01, 2016 shares	Feb. 01, 2014 shares	Apr. 29, 2017 shares	Mar. 31, 2017 Installment shares	Feb. 28, 2017 shares	May 31, 2016 shares	Mar. 31, 2016 shares	May 31, 2015 Installment shares	Mar. 31, 2015 shares	Jul. 29, 2017 USD ($) $ / shares shares	Jul. 30, 2016 $ / shares shares	Jul. 29, 2017 USD ($) Equity_Plan $ / shares shares	Jul. 30, 2016 $ / shares	Apr. 30, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity incentive plan \| Equity_Plan													1
Number of shares outstanding				685,456							723,470		723,470
Number of options granted											132,189
Maximum disposal restricted percentage of RSU													50.00%
Options granted weighted-average fair value per share \| $ / shares											$ 5.62	$ 2.86	$ 4.46	$ 3.20
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]
Incentive plan, expiration period													2025-05
Shares available for grant under the Plan											137,430		137,430
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Stock Purchase Plan discount rate													15.00%
Shares purchase under Employee Stock Purchase Plan											1,390	1,507
2007 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive plan, expiration period													2017-05
Number of shares outstanding											581,310		581,310
Number of new award issued													0
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
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
Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted					50,000			50,000		50,000
Chief Executive Officer [Member] \| 2015 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant under the Plan											500,000		500,000
Other Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted										35,000
Certain Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted							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
Equity Incentive Plan [Member] \| Non-Employee Director [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
Number of stock options grant to each non-employee director											7,314	8,262
RSA [Member] \| Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stocks, granted								4,030		537
Restricted Stock And Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of annual vesting installments \| Installment					4
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to options \| $											$ 841,000		$ 841,000
Unrecognized compensation expense to be recognized, Weighted average period													2 years 7 months 6 days
Stock Options [Member] \| 2015 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period													4 years
Option expiration period													10 years
2014 Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of accelerated vesting shares			4,166
Number of vesting shares															9,300
Unrecognized compensation expense to be recognized, Weighted average period													8 months 12 days
Unrecognized compensation expense related to RSUs and RSAs \| $											$ 600,000		$ 600,000
2014 Restricted Stock Units (RSUs) [Member] \| Third Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of vesting shares															9,300
2014 Restricted Stock Units (RSUs) [Member] \| Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative budgeted net sales target measurement period													2014 through 2016
2014 Restricted Stock Units (RSUs) [Member] \| Officer [Member] \| Net Sales Target [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock unit vested percentage													50.00%
2014 Restricted Stock Units (RSUs) [Member] \| Officer [Member] \| ORONA Target [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock unit vested percentage													25.00%
2014 Restricted Stock Units (RSUs) [Member] \| Officer [Member] \| Third Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock unit vested percentage													25.00%
Time Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stocks, granted									80,000
Number of annual vesting installments \| Installment									4
Performance Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period									3 years
Restricted stocks, granted									155,000
Performance Based Restricted Stock Units RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of vesting shares				9,025											15,810