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Employee Benefit Plan	12 Months Ended
Employee Benefit Plan	Jan. 31, 2017
Compensation And Retirement Disclosure [Abstract]
Employee Benefit Plan	Note 15. Employee Benefit Plan The Company maintained a qualified defined contribution plan under Section 401(k) of the Internal Revenue Code. Under the 401(k) Plan, participating employees may elect to contribute up to 90% of their eligible compensation, subject to certain limitations. The Company matches certain percentages of employee contributions. Both employee and employer contributions vest immediately upon contribution. During the years ended January 31, 2017, 2016 and 2015, the Company’s contributions to the 401(k) Plan amounted to approximately $1.4 million, $1.5 million and $85,000, respectively.