Stockholders' Equity

6 Months Ended

Jun. 30, 2018

Equity [Abstract]

Stockholders' Equity

9. Stockholders’ Equity

On April 5, 2017, the Company closed an underwritten follow-on offering for 5,117,500 shares of its common stock, including the full exercise of the underwriters’ option to purchase 667,500 additional shares of its common stock. The Company received net proceeds of approximately $86,224, after deducting $5,891 relating to underwriting discounts and commissions and offering expenses. This offering was made pursuant to the Company’s Registration Statement on Form S-3 (File No. 333-216657), filed with the SEC on March 13, 2017 and declared effective on March 24, 2017, and a related prospectus dated March 24, 2017 and prospectus supplement dated March 30, 2017, which was filed with the SEC on March 31, 2017.  

On May 18, 2018, the Company issued 1,174,827 shares of its common stock to Vifor in connection with the license agreement entered into with VFMCRP (refer to Note 10, Collaboration and Licensing Agreements).

On July 23, 2018, the Company closed an underwritten follow-on offering for 5,175,000 shares of its common stock, including the full exercise of the underwriters’ option to purchase 675,000 additional shares of its common stock. The Companyreceived net proceeds of approximately $92,026, after deducting $6,300 relating to underwriting discounts and commissions and estimated offering expenses. This offering was made pursuant to the Company’s Registration Statement on Form S-3 (File No. 333-216657) filed with the SEC on March 13, 2017 and declared effective on March 24, 2017, and a related prospectus supplement dated July 18, 2018, which was filed with the SEC on July 20, 2018 (see Note 16, Subsequent Event).