Segment Information, Significant Customers and Geographic Information - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area (Parenthetical) (Detail) - USD ($) $ in Thousands |
3 Months Ended | |
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Apr. 30, 2019 |
Apr. 30, 2018 |
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| Segment Reporting Information [Line Items] | ||
| Total revenues | $ 8,485 | $ 14,935 |
| United States Revenue [Member] | ||
| Segment Reporting Information [Line Items] | ||
| Total revenues | $ 3,398 | $ 5,787 |
| Total Revenues [Member] | Customer Concentration Risk [Member] | ||
| Segment Reporting Information [Line Items] | ||
| % of total revenue | 17.00% | |
| Total Revenues [Member] | Customer Concentration Risk [Member] | United States Revenue [Member] | ||
| Segment Reporting Information [Line Items] | ||
| % of total revenue | 40.00% | 39.00% |
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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