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Description of Business and Basis of Presentation - Additional Information (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Nov. 29, 2017
USD ($)
Jul. 31, 2018
USD ($)
Customer
Jul. 31, 2017
USD ($)
Customer
Jul. 31, 2018
USD ($)
Customer
Jul. 31, 2017
USD ($)
Customer
Jan. 31, 2018
USD ($)
Customer
Jan. 31, 2017
USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Customer contracts, estimated expected benefit period       5 years      
Net cash provided by (used in) operating activities   $ (1,267,000) $ (9,761,000) [1] $ 17,173,000 $ (1,220,000) [1]    
Release and decrease of restricted cash $ (26,100,000)            
Sales commission estimated period of amortization on straight-line basis       5 years      
Minimum              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Period of subscription and premier services contracts       1 year      
Maximum              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Period of subscription and premier services contracts       3 years      
Previously Reported              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Net cash provided by (used in) operating activities     (9,523,000)   (982,000) $ 61,800,000 $ (1,200,000)
Accounting Standards Update 2016-18              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Net cash provided by (used in) operating activities     (9,761,000)   (1,220,000)    
Release and decrease of restricted cash     (200,000)   (200,000)    
Accounting Standards Update 2016-18 | Adjustment              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Net cash provided by (used in) operating activities     $ (238,000)   $ (238,000) $ 35,400,000 $ (2,400,000)
Accounting Standards Update 2016-01              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Impairment adjustment on investments   0   $ 0      
Accounting Standards Update 2016-01 | Reported Value Measurement | Other Long-Term Assets              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Investments on equity securities   $ 100,000   $ 100,000      
Credit Concentration Risk | Accounts Receivable              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Number of major customer | Customer   0   0   1  
Concentration risk percentage       10.00%   10.00%  
Customer Concentration Risk | Revenue              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Number of major customer | Customer   1 0 1 0    
Concentration risk percentage   10.00% 10.00% 10.00% 10.00%    
Geographic Concentration Risk | Revenue | Non-U.S.              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Concentration risk percentage   24.00% 21.00% 24.00% 21.00%    
Geographic Concentration Risk | Revenue | United States              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Concentration risk percentage   76.00% 79.00% 76.00% 79.00%    
Geographic Concentration Risk | Property and Equipment | United States              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Concentration risk percentage       91.00%   95.00%  
[1] Adjusted due to the adoption of ASU 2016-18