Stockholders' Equity	9 Months Ended
Sep. 30, 2018
Stockholders' Equity
Stockholders' Equity	7. Stockholders’ Equity Preferred Stock As of September 30, 2018 and December 31, 2017, the Company’s amended and restated certificate of incorporation authorized the Company to issue 10,000,000 shares of undesignated preferred stock. No shares of preferred stock were outstanding as of September 30, 2018 or December 31, 2017. Common Stock As of September 30, 2018 and December 31, 2017, the Company’s amended and restated certificate of incorporation authorized the Company to issue 100,000,000 shares of $0.00001 par value common stock. Each share of common stock entitles the holder to one vote on all matters submitted to a vote of the Company’s stockholders. Common stockholders are entitled to receive dividends, as may be declared by the board of directors, if any, subject to any preferential dividend rights of any series of preferred stock that may be outstanding. The Company did not declare any dividends through September 30, 2018. At-The-Market Equity Offering In November 2016, the Company entered into an at-the-market sales agreement with Cowen and Company, LLC (“Cowen”) to sell the Company’s securities under a shelf registration statement filed in November 2016. In October 2018, the Company terminated the at-the-market sales agreement with Cowen. During the nine months ended September 30, 2018, the Company did not issue any shares of common stock under the at-the-market sales agreement. As of September 30, 2018, the Company had issued and sold an aggregate of 635,000 shares of common stock under the at-the-market sales agreement at a weighted average price per share of $31.50, for aggregate gross proceeds of $20,003. The Company has incurred expenses of $691 in connection with the shares issued under the at-the-market sales agreement. Public Offerings of Common Stock In August 2017, the Company entered into an underwriting agreement pursuant to which the Company issued and sold 3,747,602 shares of common stock under a registration statement on Form S-3, including the underwriters’ partial exercise of their option to purchase additional shares. The shares of common stock were sold to the public at a price of $23.02 per share, for gross proceeds of $86,270. The Company paid underwriting discounts and commissions of $5,176 to the underwriters and incurred expenses of $176 in connection with this public offering. The net offering proceeds received by the Company, after deducting underwriting discounts and commissions and offering expenses, were $80,918. In October 2018, the Company consummated a second public offering of shares of common stock (see Note 15).

7. Stockholders’ Equity

Preferred Stock

As of September 30, 2018 and December 31, 2017, the Company’s amended and restated certificate of incorporation authorized the Company to issue 10,000,000 shares of undesignated preferred stock. No shares of preferred stock were outstanding as of September 30, 2018 or December 31, 2017.

Common Stock

As of September 30, 2018 and December 31, 2017, the Company’s amended and restated certificate of incorporation authorized the Company to issue 100,000,000 shares of $0.00001 par value common stock.

Each share of common stock entitles the holder to one vote on all matters submitted to a vote of the Company’s stockholders. Common stockholders are entitled to receive dividends, as may be declared by the board of directors, if any, subject to any preferential dividend rights of any series of preferred stock that may be outstanding. The Company did not declare any dividends through September 30, 2018.

At-The-Market Equity Offering

In November 2016, the Company entered into an at-the-market sales agreement with Cowen and Company, LLC (“Cowen”) to sell the Company’s securities under a shelf registration statement filed in November 2016. In October 2018, the Company terminated the at-the-market sales agreement with Cowen. During the nine months ended September 30, 2018, the Company did not issue any shares of common stock under the at-the-market sales agreement. As of September 30, 2018, the Company had issued and sold an aggregate of 635,000 shares of common stock under the at-the-market sales agreement at a weighted average price per share of $31.50, for aggregate gross proceeds of $20,003. The Company has incurred expenses of $691 in connection with the shares issued under the at-the-market sales agreement.

Public Offerings of Common Stock

In August 2017, the Company entered into an underwriting agreement pursuant to which the Company issued and sold 3,747,602 shares of common stock under a registration statement on Form S-3, including the underwriters’ partial exercise of their option to purchase additional shares. The shares of common stock were sold to the public at a price of $23.02 per share, for gross proceeds of $86,270. The Company paid underwriting discounts and commissions of $5,176 to the underwriters and incurred expenses of $176 in connection with this public offering. The net offering proceeds received by the Company, after deducting underwriting discounts and commissions and offering expenses, were $80,918.

In October 2018, the Company consummated a second public offering of shares of common stock (see Note 15).