Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies - Additional Information (Detail)

v3.19.3
Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 9 Months Ended
Oct. 31, 2019
USD ($)
Customer
Jan. 31, 2019
Customer
Oct. 31, 2018
Customer
Oct. 31, 2019
USD ($)
Customer
Oct. 31, 2018
USD ($)
Customer
Feb. 01, 2019
USD ($)
Significant Accounting Policies [Line Items]            
Accumulated goodwill impairment charges $ 54,800,000     $ 54,800,000    
Impairment costs       0 $ 0  
Operating lease right-of-use assets 2,438,000     2,438,000   $ 1,700,000
Operating lease liability $ 2,567,000     $ 2,567,000   $ 1,700,000
Maximum [Member]            
Significant Accounting Policies [Line Items]            
Contractual customer payment terms for goods or service.       1 year    
Credit Concentration Risk [Member] | Accounts Receivable [Member]            
Significant Accounting Policies [Line Items]            
Number of customers accounted | Customer   2   3    
Credit Concentration Risk [Member] | Accounts Receivable [Member] | Customer One [Member]            
Significant Accounting Policies [Line Items]            
Concentration risk percentage   44.00%   14.00%    
Credit Concentration Risk [Member] | Accounts Receivable [Member] | Customer Two [Member]            
Significant Accounting Policies [Line Items]            
Concentration risk percentage   15.00%   14.00%    
Credit Concentration Risk [Member] | Accounts Receivable [Member] | Customer Three [Member]            
Significant Accounting Policies [Line Items]            
Concentration risk percentage       12.00%    
Customer Concentration Risk [Member] | Total Revenue [Member]            
Significant Accounting Policies [Line Items]            
Number of customers accounted | Customer 2   4 0 2  
Customer Concentration Risk [Member] | Total Revenue [Member] | Minimum [Member]            
Significant Accounting Policies [Line Items]            
Concentration risk percentage       10.00%    
Customer Concentration Risk [Member] | Total Revenue [Member] | Customer One [Member]            
Significant Accounting Policies [Line Items]            
Concentration risk percentage 13.00%   13.00%   16.00%  
Customer Concentration Risk [Member] | Total Revenue [Member] | Customer Two [Member]            
Significant Accounting Policies [Line Items]            
Concentration risk percentage 13.00%   12.00%   12.00%  
Customer Concentration Risk [Member] | Total Revenue [Member] | Customer Three [Member]            
Significant Accounting Policies [Line Items]            
Concentration risk percentage     10.00%      
Customer Concentration Risk [Member] | Total Revenue [Member] | Customer Four [Member]            
Significant Accounting Policies [Line Items]            
Concentration risk percentage     10.00%