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Goodwill and Other Intangible Assets - Goodwill and Other Intangible Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Jan. 31, 2017 | Jan. 31, 2016 | Jan. 31, 2015
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill | $ 3,997 | $ 4,155 | $ 5,594
Gross Carrying Amount | 14,431 | 14,517 |
Accumulated Amortization | (5,419) | (4,051) |
Net Carrying Amount | $ 9,012 | 10,466 | $ 10,831
Proprietary Rights [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Remaining Life | 5 years 10 months 24 days |  |
Gross Carrying Amount | $ 5,810 | 5,959 |
Accumulated Amortization | (3,003) | (2,645) |
Net Carrying Amount | $ 2,807 | 3,314 |
Customer Relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Remaining Life | 4 years 9 months 18 days |  |
Gross Carrying Amount | $ 4,679 | 4,633 |
Accumulated Amortization | (1,656) | (1,006) |
Net Carrying Amount | $ 3,023 | 3,627 |
Patents [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Remaining Life | 5 years 10 months 24 days |  |
Gross Carrying Amount | $ 1,608 | 1,592 |
Accumulated Amortization | (558) | (369) |
Net Carrying Amount | $ 1,050 | 1,223 |
Trade Name [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Remaining Life | 9 years 3 months 18 days |  |
Gross Carrying Amount | $ 884 | 883 |
Accumulated Amortization | (27) | (17) |
Net Carrying Amount | $ 857 | 866 |
Customer Backlog [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Remaining Life | 0 years |  |
Gross Carrying Amount | $ 20 | 20 |
Accumulated Amortization | $ (20) | (2) |
Net Carrying Amount |  | 18 |
Developed Technology [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Remaining Life | 8 years 10 months 24 days |  |
Gross Carrying Amount | $ 1,430 | 1,430 |
Accumulated Amortization | (155) | (12) |
Net Carrying Amount | $ 1,275 | $ 1,418 |

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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