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Retirement plans 401K (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jan. 31, 2018 | Jan. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 313 | $ 405
Maximum % of each participant's salary | 16.00% |
Defined Contribution Plan, Description | The Company matches 100% of each participant's payroll deferral contributions up to 1% of their compensation, plus 50% of each participant's payroll deferral contributions on the next 5% of compensation |
Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Maximum % of each participant's salary | 1.00% |

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- Definition 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. + References No definition available. + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Definition Description of defined contribution pension and other postretirement plans. Includes, but is not limited to, plan utilized, employee group covered, and employer matching contributions. + References No definition available. + Details
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- Details
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