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Overview and Basis of Presentation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended
--- | --- | --- | ---
Apr. 07, 2017 | Apr. 06, 2017 | Apr. 30, 2017 | Apr. 30, 2016
Class of Stock [Line Items] |  |  |  |
Initial public offering costs |  |  | $ 2,246 | $ 390
Class A Common Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Price per share in initial public offering (in dollars per share) | $ 17.00 |  |  |
Common stock outstanding (in shares) |  |  | 12,782,342 |
Redeemable Convertible Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Redeemable convertible preferred stock converted to common class B stock (in shares) |  | 59,491,640 |  |
Class B Common Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common class B stock after conversion of redeemable convertible stock (in shares) |  | 59,491,640 |  |
Common stock outstanding (in shares) |  |  | 82,442,536 |
Initial Public Offering |  |  |  |
Class of Stock [Line Items] |  |  |  |
Proceeds from initial public offering, net of underwriters' discounts and commissions | $ 200,000 |  |  |
Initial public offering costs | $ 5,600 |  |  |
Initial Public Offering | Class A Common Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares issued in initial public offering (in shares) | 12,650,000 |  |  |
Underwriters' Option to Purchase Additional Shares | Class A Common Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares issued in initial public offering (in shares) | 1,650,000 |  |  |

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