Income taxes

9 Months Ended

Oct. 31, 2019

Income Tax Disclosure [Abstract]

Income taxes

13. Income taxes

The effective tax rate is 0% and 0% in the nine months ended October 31, 2019 and 2018, respectively. The difference between the U.S. Statutory rate of 21% and the effective tax rate is primarily due to the change in valuation allowance. The Company has recorded a full valuation allowance against its deferred tax assets at October 31, 2019 and January 31, 2019.