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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 |  |  |

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