Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity

Stockholders' Equity
9 Months Ended
Sep. 30, 2017
Equity [Abstract]  
Stockholders' Equity



Stockholders’ Equity

Common Stock

In May 2017, the Company completed a public offering of 5,980,000 shares of its common stock at a public offering price of $5.50 per share. The shares were registered pursuant to a registration statement on Form S-3 filed on August 14, 2014. The Company received net proceeds of $30.6 million, after deducting underwriting discounts and commissions and offering-related transaction costs. Immediately following the offering, the Company used $11.2 million of the net proceeds to repurchase and retire 2,166,836 shares of its common stock from funds affiliated with Advent Private Equity (collectively Advent) at a price of $5.17 per share, which is equal to the net proceeds per share that the Company received from the offering, before expenses, pursuant to a stock purchase agreement the Company entered into with Advent in May 2017.


In 2013, the Company issued warrants exercisable for 1,124,026 shares of Series B preferred stock, at an exercise price of $0.90 per share, to certain existing investors in conjunction with a private placement (the 2013 Warrants) and warrants exercisable for 111,112 shares of Series B preferred stock, at an exercise price of $0.90 per share, to Oxford Finance LLC and Silicon Valley Bank in conjunction with the Company’s entry into a loan and security agreement (the Lender Warrants). Upon completion of the IPO, the 2013 Warrants and the Lender Warrants became exercisable for 136,236 and 13,468 shares of common stock, respectively, at an exercise price of $7.43 per share. The 2013 Warrants and the Lender Warrants will expire on May 30, 2018 and July 3, 2023, respectively.

Stock Options

The following table summarizes the Company’s stock option activity under all stock option plans for the nine months ended September 30, 2017:













Balance at December 31, 2016




































Balance at September 30, 2017










On August 31, 2017, in connection with the appointment of its new Executive Vice President, Chief Operating Officer and Chief Financial Officer, the Company granted stock options to purchase 525,000 shares of the Company’s common stock outside of its stock option plans.  The grant was made as an inducement that was a material component of the executive’s compensation and acceptance of employment with the Company and was granted as an employment inducement award pursuant to NASDAQ Listing Rule 5635(c)(4).  While granted outside of the Company’s stock option plans, the terms and conditions of this award are consistent with awards granted to the Company’s executive officers pursuant to the Company’s 2013 Incentive Award Plan. The stock options will vest over a four-year period, with a quarter of the options vesting on the first anniversary of the date of grant and the remainder of the options vesting monthly over the subsequent three years.

Stock-Based Compensation

The Company recorded stock-based compensation of $1.0 million and $0.7 million for the three months ended September 30, 2017 and 2016, respectively, and $3.0 million and $2.5 million for the nine months ended September 30, 2017 and 2016, respectively.

Common Stock Reserved for Future Issuance

The following shares of common stock were reserved for future issuance at September 30, 2017:


Warrants to purchase common stock





Common stock options issued and outstanding





Common stock authorized for future option grants





Common stock authorized for the ESPP





Shares issuable upon conversion of convertible note payable