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Share-Based Compensation - Additional Information (Detail) |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
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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

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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