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Convertible Preferred Stock
6 Months Ended
Jun. 30, 2019
Temporary Equity Disclosure [Abstract]  
Convertible Preferred Stock

8. CONVERTIBLE PREFERRED STOCK

As of January 1, 2018, the Company had 28,763,179 shares of Series A convertible preferred stock outstanding. In February and March 2018, the Company issued an aggregate of 19,641,200 shares of its Series B convertible preferred stock for total proceeds of $63.5 million, net of issuance costs of $0.2 million. The holders of the Company’s Series A and B convertible preferred stock were entitled to certain customary preferences, such as dividend and liquidation priority in relationship to the common shareholders, and certain anti-dilution protection. The convertible preferred stock was classified outside of stockholders’ equity (deficit) because the shares contained certain redemption features that were not solely within the control of the Company.

In connection with the Company’s initial public offering in July 2018, all of these shares of convertible preferred stock automatically converted into 14,712,571 shares of common stock.