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Goodwill and Other Intangible Assets - Schedule of Net Carrying Amount (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jul. 31, 2018
Jan. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Goodwill, Gross Carrying Amount $ 7,060 $ 7,060
Goodwill, Impairment (4,529) (4,529)
Goodwill, Net Carrying Amount 2,531 2,531
Gross Carrying Amount 19,075 15,259
Accumulated Amortization (8,038) (7,244)
Net Carrying Amount $ 11,037 8,015
Proprietary rights    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life 7 years 10 months 24 days  
Gross Carrying Amount $ 9,286 6,181
Accumulated Amortization (3,915) (3,663)
Net Carrying Amount $ 5,371 2,518
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life 3 years 3 months 19 days  
Gross Carrying Amount $ 5,024 5,024
Accumulated Amortization (2,805) (2,464)
Net Carrying Amount $ 2,219 2,560
Patents    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life 5 years 10 months 24 days  
Gross Carrying Amount $ 2,441 1,730
Accumulated Amortization (903) (778)
Net Carrying Amount $ 1,538 952
Trade name    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life 7 years 9 months 18 days  
Gross Carrying Amount $ 894 894
Accumulated Amortization (46) (41)
Net Carrying Amount $ 848 853
Developed technology    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life 7 years 4 months 24 days  
Gross Carrying Amount $ 1,430 1,430
Accumulated Amortization (369) (298)
Net Carrying Amount $ 1,061 $ 1,132