Net Loss per Share - Additional Information (Details) |
3 Months Ended |
|---|---|
|
Apr. 30, 2018
vote
| |
| Class A Common Stock | |
| Class of Stock [Line Items] | |
| Number of votes per share | 1 |
| Class B Common Stock | |
| Class of Stock [Line Items] | |
| Number of votes per share | 10 |