| Id | Content |
|---|---|
| F1 | Shares sold to satisfy the tax withholding obligations by the Reporting Person in connection with the vesting of RSUs. |
| F2 | Includes 3,000 shares of common stock purchased under the Company's 2018 Employee Stock Purchase Plan. |
| F3 | Includes 3,953 shares received as a pro-rata in-kind distribution of Common Stock of the Issuer by Alta Partners Management VIII, LLC (APM VIII), without consideration, to the reporting person as a non-managing member of APM VIII. |
| F4 | The shares are held by Mr. Tomasi and Carrie Tomasi, as Trustees of the Tomasi Living Trust dated July 14, 2017. |