Annual report pursuant to Section 13 and 15(d)

Capital Stock

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Capital Stock
12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Capital Stock Capital Stock
Private Offering
In June 2019, we entered into a Securities Purchase Agreement with an affiliate of Casdin Capital ("Casdin") pursuant to which we issued and sold to Casdin 3,048,780 shares of our common stock ("Shares") at a purchase price of $16.40 per share. After deducting issuance costs of $0.1 million from the Private Offering, our net proceeds were $49.9 million. On November 6, 2019, we filed a prospectus supplement to our registration statement on Form S-3ASR (File No. 333-228693) registering the resale of the Shares.
In June 2019, we also entered into a Registration Rights Agreement (the “Registration Rights Agreement”) with Casdin. Pursuant to the Registration Rights Agreement, we agreed, subject to certain conditions, to prepare and file a registration statement with the Securities and Exchange Commission (the “SEC”) within 180 days after the closing of the Private Offering, if we are a “well known seasoned issuer” at such time (210 days if we are not then a “well known seasoned issuer”) for purposes of registering the resale of the Shares and any shares of common stock issued as a dividend or other distribution with respect to the Shares (collectively, the “Securities”). We further agreed, among other things, to indemnify the selling holders under the registration statement from certain losses, claims, damages and liabilities and to pay all fees and expenses (excluding underwriting discounts and selling commissions) incident to the performance of, or compliance with, our obligations under the Registration Rights Agreement. On November 6, 2019, we filed a prospectus supplement to our registration statement on Form S-3ASR (File No. 333-228693), registering the resale of the Securities.
Public Offering

In April 2018, we completed an underwritten public offering of 4,312,500 shares of our common stock, including the exercise in full by the underwriters of their option to purchase 562,500 of our shares, at a public offering price of $9.25 per share. After deducting the underwriting discounts and commissions and estimated offering expenses, net proceeds were approximately $37.3 million.