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Goodwill and Other Intangible Assets - Goodwill and Other Intangible Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill, Gross Carrying Amount | $ 7,060 | $ 7,060 |
Goodwill Impairment | (4,529) | (3,063) |
Goodwill, Net Carrying Amount | 2,531 | 3,997 | $ 4,155
Gross Carrying Amount | 15,259 | 14,411 |
Accumulated Amortization | (7,244) | (5,399) |
Net Carrying Amount | $ 8,015 | 9,012 | $ 10,466
Proprietary rights |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted average remaining life | 4 years 10 months 9 days |  |
Gross Carrying Amount | $ 6,181 | 5,810 |
Accumulated Amortization | (3,663) | (3,003) |
Net Carrying Amount | $ 2,518 | 2,807 |
Customer relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted average remaining life | 3 years 9 months 16 days |  |
Gross Carrying Amount | $ 5,024 | 4,679 |
Accumulated Amortization | (2,464) | (1,656) |
Net Carrying Amount | $ 2,560 | 3,023 |
Patents |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted average remaining life | 5 years |  |
Gross Carrying Amount | $ 1,730 | 1,608 |
Accumulated Amortization | (778) | (558) |
Net Carrying Amount | $ 952 | 1,050 |
Trade name |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted average remaining life | 8 years 3 months 16 days |  |
Gross Carrying Amount | $ 894 | 884 |
Accumulated Amortization | (41) | (27) |
Net Carrying Amount | $ 853 | 857 |
Developed technology |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted average remaining life | 7 years 10 months 16 days |  |
Gross Carrying Amount | $ 1,430 | 1,430 |
Accumulated Amortization | (298) | (155) |
Net Carrying Amount | $ 1,132 | $ 1,275 |

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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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