Revenue and Deferred Revenue - Components of Deferred Revenue (Details) - USD ($) $ in Thousands	Oct. 31, 2019	Jan. 31, 2019
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 16,195	$ 15,750
Less: current deferred revenue	16,005	15,443
Non-current deferred revenue included in other long-term liabilities	190	307
Subscription and Services
Deferred Revenue Arrangement [Line Items]
Deferred revenue	16,112	15,682
Product and Other
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 83	$ 68