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

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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