Quarterly report pursuant to Section 13 or 15(d)

Capital Stock

Capital Stock
9 Months Ended
Sep. 30, 2019
Equity [Abstract]  
Capital Stock Capital Stock
Exercise of Options
For the nine months ended September 30, 2019 and September 30, 2018, 970,256 and 729,596 shares, respectively, were issued upon option exercises at a weighted-average exercise price of $4.76 and $5.92 per share, respectively, with net cash proceeds of $4.6 million and $4.3 million, respectively.

Private Offering
In June 2019, we entered into a Securities Purchase Agreement with an affiliate of 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.
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. 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.
The Private Offering was exempt from registration pursuant to the exemption for transactions by an issuer not involving any public offering under Section 4(a)(2) the Securities Act, and Regulation D under the Securities Act.