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

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Share-Based Compensation - Additional Information (Detail)			1 Months Ended												3 Months Ended				6 Months Ended
	Aug. 01, 2016 shares	Feb. 01, 2014 shares	Jun. 30, 2018 shares	May 31, 2018 shares	Jan. 31, 2018 shares	Dec. 31, 2017 shares	Apr. 29, 2017 shares	Mar. 31, 2017 shares	Feb. 28, 2017 shares	May 31, 2016 shares	Apr. 30, 2016 shares	Mar. 31, 2016 shares	May 31, 2015 Installment shares	Mar. 31, 2015 shares	Jul. 28, 2019 shares	Jul. 28, 2018 USD ($) $ / shares shares	Apr. 28, 2018 shares	Jul. 29, 2017 $ / shares	Jul. 28, 2018 USD ($) $ / shares shares	Jul. 29, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum disposal restricted percentage of RSU																			50.00%
Number of options granted																			196,000
Vesting period			3 years
Options granted weighted-average fair value per share \| $ / shares																$ 7.42		$ 5.62	$ 7.41	$ 4.46
Reservation of shares under Stock Purchase Plan																			247,500
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																			2,342	2,897
Shares available for grant under the Plan																36,865			36,865
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			650,000
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
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				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 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
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 \| $																$ 2,000,000			$ 2,000,000
Unrecognized compensation expense to be recognized, Weighted average period																			2 years 8 months 12 days
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																			1 year 3 months 18 days
Unrecognized compensation expense related to RSUs and RSAs \| $																$ 1,400,000			$ 1,400,000
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%
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
2014 Restricted Stock Units (RSUs) [Member] \| Newly Elected Member of Board of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stocks, granted																	341
RSA [Member] \| Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stocks, granted												4,030		537
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																7,314
Equity Incentive Plan [Member] \| Non-Employee Director [Member] \| Scenario, Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options grant to each non-employee director															5,370
Time Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stocks, granted			44,275										80,000
Number of annual vesting installments \| Installment													4
Performance Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stocks, granted													155,000
Vesting period													3 years
Performance Based Restricted Stock Units RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stocks, granted			38,000
Number of vesting shares							9,025				15,810						33,638
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
Non Qualified Options [Member] \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted			25,000