Stockholder's Equity	6 Months Ended
Jun. 30, 2020
Stockholders Equity Note [Abstract]
Stockholders' Equity	8. STOCKHOLDERS’ EQUITY Authorized Shares In connection with the completion of the Company’s initial public offering in July 2018, the Company amended and restated its certificate of incorporation to authorize 200,000,000 shares of common stock, par value $0.001 per share, and 10,000,000 shares of preferred stock, par value $0.001 per share. Stock Offering On April 17, 2020, the Company completed a public offering of 8,222,500 shares of its common stock at a public offering price of $14.00 per share. Proceeds from the offering were approximately $107.9 million, net of underwriting discounts and commissions and offering costs of $7.3 million. The shares were registered pursuant to the Company’s Shelf Registration Statement discussed below. Shelf Registration Statement and ATM Offering On August 13, 2019, the Company filed a registration statement on Form S-3 (the “Shelf Registration Statement”), covering the offering of up to $300.0 million of common stock, preferred stock, debt securities, warrants and units. The Registration Statement became effective on August 29, 2019. On August 13, 2019 the Company also entered into a Sales Agreement (the “Sales Agreement”) with SVB Leerink LLC and Cantor Fitzgerald & Co. (collectively, the “Sales Agents”), under which the Company may, from time to time, sell shares of its common stock having an aggregate offering price of up to $75.0 million through the Sales Agents (the “ATM Offering”). The Shelf Registration Statement included a prospectus covering the offering, issuance and sale of up to $75.0 million of the Company’s common stock from time to time through the ATM Offering. The shares to be sold under the Sales Agreement may be issued and sold pursuant to the Shelf Registration Statement. During the three-month period ended March 31, 2020, the Company issued 275,764 shares of common stock in the ATM Offering for net proceeds of $6.4 million, after deducting commissions. The Company did not issue any additional shares of common stock in the ATM Offering during the three-month period ended June 30, 2020.

Stockholder's Equity

6 Months Ended

Jun. 30, 2020

8. STOCKHOLDERS’ EQUITY

Authorized Shares

In connection with the completion of the Company’s initial public offering in July 2018, the Company amended and restated its certificate of incorporation to authorize 200,000,000 shares of common stock, par value $0.001 per share, and 10,000,000 shares of preferred stock, par value $0.001 per share.

Stock Offering

On April 17, 2020, the Company completed a public offering of 8,222,500 shares of its common stock at a public offering price of $14.00 per share. Proceeds from the offering were approximately $107.9 million, net of underwriting discounts and commissions and offering costs of $7.3 million. The shares were registered pursuant to the Company’s Shelf Registration Statement discussed below.

Shelf Registration Statement and ATM Offering

On August 13, 2019, the Company filed a registration statement on Form S-3 (the “Shelf Registration Statement”), covering the offering of up to $300.0 million of common stock, preferred stock, debt securities, warrants and units. The Registration Statement became effective on August 29, 2019.

On August 13, 2019 the Company also entered into a Sales Agreement (the “Sales Agreement”) with SVB Leerink LLC and Cantor Fitzgerald & Co. (collectively, the “Sales Agents”), under which the Company may, from time to time, sell shares of its common stock having an aggregate offering price of up to $75.0 million through the Sales Agents (the “ATM Offering”). The Shelf Registration Statement included a prospectus covering the offering, issuance and sale of up to $75.0 million of the Company’s common stock from time to time through the ATM Offering. The shares to be sold under the Sales Agreement may be issued and sold pursuant to the Shelf Registration Statement.

During the three-month period ended March 31, 2020, the Company issued 275,764 shares of common stock in the ATM Offering for net proceeds of $6.4 million, after deducting commissions. The Company did not issue any additional shares of common stock in the ATM Offering during the three-month period ended June 30, 2020.