Subsequent Events - 2018 Employee Stock Purchase Plan (Details) - Employee Stock Purchase Plan - Subsequent Events |
Apr. 17, 2018
shares
|
|---|---|
| Share-based compensation | |
| Number of shares available for future issuance (in shares) | 1,735,729 |
| Percentage of increase in number of shares of common stock outstanding (as a percent) | 1.00% |