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401(k) Plan	12 Months Ended
401(k) Plan	Jan. 31, 2018
Defined Benefit Pension Plans And Defined Benefit Postretirement Plans Disclosure [Abstract]
401(k) Plan	(9) 401(k) Plan The Company maintains a tax-qualified retirement plan, or the 401(k) plan. Participants are able to defer eligible compensation up to applicable annual Internal Revenue Code limits. All participants’ interests in their deferrals are 100% vested when contributed. The 401(k) plan allows the Company to make matching contributions and profit sharing contributions to eligible participants. No contributions were made for the years ended January 31, 2016, 2017, and 2018.