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Share-Based Compensation - Additional Information (Detail) |  |  |  | 1 Months Ended | 3 Months Ended | 9 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 | Apr. 30, 2016 shares | Mar. 31, 2016 shares | May 31, 2015 Installment shares | Mar. 31, 2015 shares | Oct. 28, 2017 USD ($) shares | Oct. 29, 2016 shares | Oct. 28, 2017 USD ($) Equity_Plan $ / shares shares | Oct. 29, 2016 $ / shares shares | Jan. 31, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of equity incentive plan | Equity_Plan |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Number of shares outstanding |  |  |  |  |  |  |  |  |  |  |  | 707,745 |  | 707,745 |  | 685,456
Number of options granted |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 132,189 |  |
Maximum disposal restricted percentage of RSU |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |
Options granted weighted-average fair value per share | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.46 | $ 3.22 |
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 |  |  |  |  |  |  |  |  |  |  |  | 177,905 |  | 177,905 |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares available for grant under the Plan |  |  |  |  |  |  |  |  |  |  |  | 40,567 |  | 40,567 |  |
Employee Stock Purchase Plan discount rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |
Shares purchase under Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,657 | 4,707 |
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 |  |  |  |  |  |  |  |  |  |  |  | 572,345 |  | 572,345 |  |
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 |  |
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 |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of stock options grant to each non-employee director |  |  |  |  |  |  |  |  |  |  |  | 7,314 | 5,495 |  |  |
RSA [Member] | 2007 Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stocks, granted |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,290 |  |
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 | $ |  |  |  |  |  |  |  |  |  |  |  | $ 694,000 |  | $ 694,000 |  |
Unrecognized compensation expense to be recognized, Weighted average period |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years 4 months 24 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 | $ |  |  |  |  |  |  |  |  |  |  |  | $ 481,000 |  | $ 481,000 |  |
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 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested options awarded to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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