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Non employee director received restricted stock award value.

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Percentage of shares granted.

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Share based compensation arrangements by share based payments award expiration period.

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Share based compensation expense payments rolling year two.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Unrecognized cost of unvested options awarded to employees as compensation.

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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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Discount rate from fair value on purchase date that participants pay for shares.

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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).

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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.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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).

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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.

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

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of shares for which recognition of compensation cost was accelerated.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Share-Based Compensation - Additional Information (Detail)			1 Months Ended										3 Months Ended		12 Months Ended
	Aug. 01, 2016 shares	Feb. 01, 2014 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	Apr. 28, 2018 USD ($) Equity_Plan $ / shares shares	Apr. 29, 2017 $ / shares shares	Jan. 31, 2019 shares	Jan. 31, 2018 shares	Jun. 04, 2018 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity incentive plan \| Equity_Plan													1
Number of options granted													5,000
Maximum disposal restricted percentage of RSU													50.00%
Options granted weighted-average fair value per share \| $ / shares													$ 6.80	$ 4.11
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 authorized for grant under the Plan													500,000
Shares available for grant under the Plan													99,284
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant under the Plan													37,991
Employee Stock Purchase Plan discount rate													15.00%
Shares purchase under Employee Stock Purchase Plan													1,216	1,507
2018 Equity Incentive Plan [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for grant under the Plan																	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								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
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													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
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]
Unrecognized compensation expense related to options \| $													$ 758,000
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													1 year 2 months 12 days
Unrecognized compensation expense related to RSUs and RSAs \| $													$ 491,000
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																7,233
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															8,542
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				33,638	9,025
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