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Revenue from Contracts with Customers - Revenue Disaggregated by Geography (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2019 | Jul. 31, 2018 | Jul. 31, 2019 | Jul. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | $ 6,745 | $ 6,012 | $ 12,727 | $ 9,720
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 1,084 | 1,124 | 1,841 | 1,252
Europe, Russia & CIS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 2,563 | 2,747 | 5,167 | 4,766
Middle East & Africa |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 358 | 122 | 549 | 636
Asia-Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 1,835 | 1,979 | 3,108 | 2,679
Canada & Latin America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | $ 905 | $ 40 | $ 2,062 | $ 387

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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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