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Description of Business and Basis of Presentation - Additional Information (Details) - USD ($)
 1 Months Ended 12 Months Ended
Jan. 31, 2015
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2014
Organization Consolidation And Presentation Of Financial Statements [Line Items]        
Deemed dividend on the conversion of Series F redeemable convertible preferred stock     $ (2,262,000)  
Initial Public Offering        
Organization Consolidation And Presentation Of Financial Statements [Line Items]        
Issuance of stock of over-allotment option     1,875,000  
Public offering price for common stock $ 14.00   $ 14.00  
Net proceeds from initial public offering     $ 187,200,000  
Underwriting discounts and commissions     14,100,000  
Initial public offering costs $ 5,700,000      
Payment of initial public offering costs   $ 2,200,000 $ 2,900,000 $ 588,000
Conversion of stock, shares converted 17,051,820      
Deemed dividend on the conversion of Series F redeemable convertible preferred stock   $ 2,300,000    
Deferred issuance cost $ 5,700,000      
Class A Common Stock | Initial Public Offering        
Organization Consolidation And Presentation Of Financial Statements [Line Items]        
Issuance of stock     14,375,000  
Redeemable Convertible Preferred Stock        
Organization Consolidation And Presentation Of Financial Statements [Line Items]        
Issuance of redeemable convertible preferred stock exercise of warrants (in shares) 85,354      
Redeemable Convertible Preferred Stock | Initial Public Offering        
Organization Consolidation And Presentation Of Financial Statements [Line Items]        
Conversion of stock, shares converted 76,238,097      
Conversion of redeemable convertible preferred stock to common stock (in shares) 11,904,759      
Deemed dividend on the conversion of Series F redeemable convertible preferred stock $ 2,300,000      
Series F Redeemable Convertible Preferred Stock        
Organization Consolidation And Presentation Of Financial Statements [Line Items]        
Issuance of stock     7,500,000  
Deemed dividend on the conversion of Series F redeemable convertible preferred stock     $ 2,262,000  
Series F Redeemable Convertible Preferred Stock | Initial Public Offering        
Organization Consolidation And Presentation Of Financial Statements [Line Items]        
Conversion of stock, shares converted 7,500,000