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Acquisitions - Additional Information (Details)
 12 Months Ended
May. 04, 2015
USD ($)
Jan. 31, 2016
USD ($)
Company
Jan. 31, 2015
USD ($)
Company
shares
Business Acquisition [Line Items]      
Business acquisition, goodwill     $ 3,161,000
Number of companies purchased and licensed | Company   2  
Business acquisition, aggregate purchase price   $ 764,000  
Shares issued in connection with acquisitions, value   6,108,000 5,239,000
Developed Technology      
Business Acquisition [Line Items]      
Business acquisition, developed technology   $ 349,000  
Weighted average useful life   2 years  
Verold, Inc.      
Business Acquisition [Line Items]      
Business acquisition, Purchase price paid in stock $ 5,400,000    
Business acquisition, goodwill 2,600,000 $ 2,644,000  
Verold, Inc. | Developed Technology      
Business Acquisition [Line Items]      
Business acquisition, developed technology $ 2,800,000    
Weighted average useful life 2 years    
Other      
Business Acquisition [Line Items]      
Business acquisition, goodwill   $ 415,000  
Fiscal 2015 Acquisitions      
Business Acquisition [Line Items]      
Business acquisition, Purchase price paid in stock     5,200,000
Business acquisition, goodwill     $ 3,200,000
Number of companies purchased and licensed | Company     2
Business acquisition, aggregate purchase price     $ 5,500,000
Business acquisition, number of shares issued | shares     408,166
Business acquisition, Purchase price paid in cash     $ 230,000
Business acquisition, tangible assets net     25,000
Business acquisition, deferred tax liabilities     $ 1,100,000
Issuance of common stock in connection with acquisition (in shares) | shares     344,667
Shares issued in connection with acquisitions, value     $ 4,500,000
Fiscal 2015 Acquisitions | Employee Bonus      
Business Acquisition [Line Items]      
Business acquisition, Purchase price paid in stock     $ 2,000,000
Business acquisition, number of shares issued | shares     155,787
Business combination, bonus cash payments to employees     $ 381,000
Fiscal 2015 Acquisitions | Employee Bonus | General and Administrative Expense      
Business Acquisition [Line Items]      
Business acquisition, aggregate transaction costs     575,000
Fiscal 2015 Acquisitions | Maximum      
Business Acquisition [Line Items]      
Cash payment obligation     889,000
Fiscal 2015 Acquisitions | Developed Technology      
Business Acquisition [Line Items]      
Business acquisition, developed technology     $ 3,400,000
Weighted average useful life     2 years