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Sales and Major Customers - Summary of Company's Revenues from Customers by Geographic Region, Outside the U.S. (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Jan. 31, 2017 | Jan. 31, 2016 | Jan. 31, 2015
Revenue, Major Customer [Line Items] |  |  |
Total revenues from customers | $ 34,747 | $ 44,503 | $ 70,591
Canada [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Total revenues from customers | 1,891 | 1,354 | 7,376
UK and Europe [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Total revenues from customers | 14,577 | 16,437 | 17,427
Latin America [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Total revenues from customers | 2,983 | 3,283 | 12,706
Asia/South Pacific [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Total revenues from customers | 10,348 | 16,623 | 18,407
Eurasia [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Total revenues from customers | 3,120 | 3,659 | 5,853
Other [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Total revenues from customers | $ 1,828 | $ 3,147 | $ 8,822

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