Revenue and Deferred Revenue - Components of Deferred Revenue (Details) - USD ($) $ in Thousands	Apr. 30, 2020	Jan. 31, 2020
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 15,522	$ 15,971
Less: current deferred revenue	15,374	15,797
Non-current deferred revenue included in other long-term liabilities	148	174
Subscription and Services
Deferred Revenue Arrangement [Line Items]
Deferred revenue	15,430	15,892
Product and Other
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 92	$ 79