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Share-Based Compensation - Additional Information (Detail)			1 Months Ended												3 Months Ended			9 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	Oct. 27, 2018 USD ($) shares	Apr. 28, 2018 shares	Oct. 27, 2017 shares	Oct. 27, 2018 USD ($) $ / shares shares	Oct. 28, 2017 $ / shares shares	Jun. 04, 2018 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted																		196,000
Award vesting period			3 years
Reservation of shares under Stock Purchase Plan																		247,500
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
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
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
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															5,300		7,314
RSA [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted date																		Mar. 30, 2017
RSA [Member] \| Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stocks, granted												4,030		537
2014 Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum disposal restricted percentage of RSU																		50.00%
Number of vesting shares											9,300
Number of accelerated vesting shares		4,166
Unrecognized compensation expense to be recognized, Weighted average period																		1 year 2 months 12 days
Unrecognized compensation expense related to RSUs and RSAs \| $															$ 1,200,000			$ 1,200,000
2014 Restricted Stock Units (RSUs) [Member] \| Third Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted											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
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
Award 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]
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
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted			126,000												0
Options granted weighted-average fair value per share \| $ / shares																		$ 7.41	$ 4.46
Unrecognized compensation expense related to options \| $															$ 1,700,000			$ 1,700,000
Unrecognized compensation expense to be recognized, Weighted average period																		2 years 6 months
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
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																		3,912	4,657
Shares available for grant under the Plan															35,294			35,294