Annual report pursuant to Section 13 and 15(d)

Severance and Other Restructuring Costs - Additional Information (Detail)

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Severance and Other Restructuring Costs - Additional Information (Detail)
$ in Thousands
 12 Months Ended 18 Months Ended 21 Months Ended
Jan. 31, 2018
USD ($)
Employee
Jan. 31, 2017
USD ($)
Employee
Jan. 31, 2018
USD ($)
Jan. 31, 2018
USD ($)
Restructuring Cost and Reserve [Line Items]        
Restructing charges excluding plan related severance costs $ 4,156      
Former Employees including Senior Vice President and Vice President [Member]        
Restructuring Cost and Reserve [Line Items]        
Additional severance charges $ 500      
Number of employees terminated | Employee 14      
Former Chief Executive Officer and Chief Financial Officer [Member]        
Restructuring Cost and Reserve [Line Items]        
Severance costs   $ 1,500    
Former Employees [Member]        
Restructuring Cost and Reserve [Line Items]        
Number of employees terminated | Employee   13    
DCC Labs [Member]        
Restructuring Cost and Reserve [Line Items]        
Total restructuring charges incurred       $ 2,000
Facility and other restructuring costs $ 100      
Restructuring Plan [Member]        
Restructuring Cost and Reserve [Line Items]        
Total restructuring charges incurred     $ 7,200  
Estimated restructuring costs 7,500   $ 7,500 $ 7,500
Severance costs $ 4,100