7. Convertible Preferred Stock

        Under the amended and restated certificate of incorporation in effect as of December 31, 2016, the Company is authorized to issue two classes of stock: preferred stock and common stock.

        Immediately prior to the consummation of the IPO on March 29, 2016, all outstanding shares of Series A and B convertible preferred stock were converted into 14,274,741 shares of common stock on a one-for-one basis. As such, no convertible preferred stock shares were outstanding as of December 31, 2016.

        Convertible preferred stock as of December 31, 2015 consisted of the following (in thousands, except share data):