v3.21.1
Retirement savings plan
 12 Months Ended
Jan. 31, 2021
Retirement Benefits [Abstract]  
Retirement savings plan Retirement savings planOn February 20, 2008, the Company established a retirement savings plan under Section 401(k) of the Internal Revenue Code (the “Plan”). The Plan covers substantially all U.S. full-time employees who meet minimum age and service requirements and allows participants to defer a portion of their annual compensation on a pre-tax and post-tax basis. Company contributions to the Plan may be made at the discretion of the Board of Directors of the Company. The Company did not make any contributions in years ended January 31, 2021, 2020 or 2019