Revenue and Deferred Revenue - Components of Deferred Revenue (Details) - USD ($) $ in Thousands	Apr. 30, 2021	Jan. 31, 2021
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 16,175	$ 16,501
Less: current deferred revenue	16,081	16,426
Non-current deferred revenue included in other long-term liabilities	94	75
Subscription and Services
Deferred Revenue Arrangement [Line Items]
Deferred revenue	15,946	16,433
Product and Other
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 229	$ 68