Revenue, Deferred Revenue and Commissions - Components of Deferred Revenue (Details) - USD ($) $ in Thousands	Apr. 30, 2018	Jan. 31, 2018
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 15,031	$ 15,984
Less: current deferred revenue	14,629	15,556
Noncurrent deferred revenue included in other long-term liabilities	402	428
Subscription and Services
Deferred Revenue Arrangement [Line Items]
Deferred revenue	14,899	14,568
Product and Other
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 132	$ 1,416

The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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