Stockholders' Equity

12 Months Ended

Dec. 31, 2018

Stockholders’ Equity

Common and Preferred Stock

On January 31, 2017, upon completion of our IPO, we amended our Certificate of Incorporation to increase the number of authorized shares of common stock to 500,000,000 with a par value of $0.001 and decrease the number of authorized shares of preferred stock to 10,000,000 with a par value of $0.001 per share.

Common Stock

Of the 500,000,000 shares of common stock authorized, 26,921,822 shares were issued and outstanding as of December 31, 2018. Common stock reserved for future issuance upon the exercise, issuance or conversion of the respective equity instruments at December 31, 2018 are as follows:



Issued and Outstanding:
Stock options	2,152,455
Shares Reserved For:
2017 Equity Incentive Plan	2,021,019
2017 Employee Stock Purchase Plan	455,193
Total	4,628,667

Warrant Exercises

During the year ended December 31, 2018, 16,770 shares of common stock were issued as a result of warrant exercises. During the year ended December 31, 2017, warrants for the purchase of 477,908 shares of common stock were exercised, of which 359,999 were exercised by a net exercise method. As a result, we issued 398,837 shares of common stock. As of December 31, 2018, all warrants have been exercised.

Repurchase of Common Stock

Certain stock option grants under our 2006 Equity Incentive Plan, or the 2006 Plan, were subject to an early exercise provision. Shares of common stock obtained upon early exercise of unvested options are subject to repurchase by us at the applicable original issue price. During the year ended December 31, 2016, we repurchased 1,457 shares of common stock. No shares were repurchased during the years ended December 31, 2018 or 2017.