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Goodwill and Other Intangible Assets - Goodwill and Other Intangible Assets (Detail) - USD ($)
$ in Thousands
3 Months Ended
Apr. 30, 2018
Jan. 31, 2018
Goodwill    
Gross Carrying Amount $ 7,060 $ 7,060
Impairment (4,529) (4,529)
Net Carrying Amount 2,531 2,531
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 19,143 15,259
Accumulated Amortization (7,659) (7,244)
Net Carrying Amount $ 11,484 8,015
Proprietary rights    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life 8 years 1 month  
Gross Carrying Amount $ 9,354 6,181
Accumulated Amortization (3,806) (3,663)
Net Carrying Amount $ 5,548 2,518
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life 3 years 7 months  
Gross Carrying Amount $ 5,024 5,024
Accumulated Amortization (2,634) (2,464)
Net Carrying Amount $ 2,390 2,560
Patents    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life 6 years 1 month  
Gross Carrying Amount $ 2,441 1,730
Accumulated Amortization (841) (778)
Net Carrying Amount $ 1,600 952
Trade name    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life 8 years 1 month  
Gross Carrying Amount $ 894 894
Accumulated Amortization (44) (41)
Net Carrying Amount $ 850 853
Developed technology    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life 7 years 8 months  
Gross Carrying Amount $ 1,430 1,430
Accumulated Amortization (334) (298)
Net Carrying Amount $ 1,096 $ 1,132