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Composition of certain financial statement captions - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jul. 31, 2020
Jan. 31, 2020
Jul. 31, 2020
Jul. 31, 2019
Jul. 31, 2020
Jul. 31, 2019
Composition Of Certain Financial Statement [Line Items]            
Depreciation     $ 2,410,000 $ 2,136,000 $ 4,678,000 $ 4,291,000
Finance lease, depreciation         1,586,000  
Assets under finance lease $ 6,630,000   6,630,000   6,630,000  
Assets under finance lease, accumulated amortization 9,310,000   9,310,000   9,310,000  
Capitalized cost of computer software     1,876,000 1,467,000 3,632,000 2,878,000
Capitalized computed software amortization     1,573,000 1,220,000 2,866,000 2,379,000
Capitalized computer software net 9,501,000 $ 8,735,000 9,501,000   9,501,000  
Amortization of intangible assets     60,000 60,000 119,000 119,000
Changes in goodwill balance         0  
Goodwill, impairment loss     0 $ 0 0 0
Goodwill 250,000 $ 250,000 250,000   250,000  
Capitalized implementation costs 213,000   213,000   213,000  
Capitalized implementation costs, accumulated amortization $ 2,000   2,000   2,000  
Loss on extinguishment of debt         $ 0 $ 1,073,000
Credit Concentration Risk | Accounts Receivable | Aged less than 30 days            
Composition Of Certain Financial Statement [Line Items]            
Concentration risk, percentage         53.00%  
Credit Concentration Risk | Accounts Receivable | Aged over 90 days            
Composition Of Certain Financial Statement [Line Items]            
Concentration risk, percentage         19.00%  
Acquired technology            
Composition Of Certain Financial Statement [Line Items]            
Finite-lived intangible assets, remaining amortization period 3 years 4 months 24 days 3 years 10 months 24 days        
Customer relationships            
Composition Of Certain Financial Statement [Line Items]            
Finite-lived intangible assets, remaining amortization period 5 years 4 months 24 days 5 years 10 months 24 days        
Computer equipment            
Composition Of Certain Financial Statement [Line Items]            
Assets under finance lease $ 15,940,000 $ 12,283,000 15,940,000   $ 15,940,000  
Assets under finance lease, accumulated amortization $ 9,310,000 $ 7,724,000 $ 9,310,000   $ 9,310,000