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Revenue and Deferred Revenue - Components of Deferred Revenue (Details) - USD ($) $ in Thousands | Apr. 30, 2019 | Jan. 31, 2019
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Deferred Revenue Arrangement [Line Items] |  |
Deferred revenue | $ 15,321 | $ 15,750
Less: current deferred revenue | 15,049 | 15,443
Non-current deferred revenue included in other long-term liabilities | 272 | 307
Subscription and Services |  |
Deferred Revenue Arrangement [Line Items] |  |
Deferred revenue | 15,234 | 15,682
Product and Other |  |
Deferred Revenue Arrangement [Line Items] |  |
Deferred revenue | $ 87 | $ 68

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