9. Warrants

In 2007, the Company issued warrants as consideration in connection with its loan commitment from General Electric Capital Corporation and Oxford Finance Corporation (“Oxford”) to purchase 69,294 of Series C-3 convertible preferred stock, maturing in 2017. These preferred stock warrants were exercisable upon issuance, and no contingent conversion feature exists. Upon closing of the initial public offering, these warrants were converted to warrants to purchase common stock and were reclassified to stockholders’ equity.

In August 2010 and December 2010, the Company issued warrants as consideration in connection with its loan commitment from Mid-Cap and SVB to purchase either Series C-3 preferred stock or preferred stock offered in a subsequent offering. The number of preferred stock warrants issued was based on the Series C-3 convertible preferred stock and an $8.12 per share exercise price. The preferred stock warrants would have matured in 2020, were exercisable upon issuance and did not contain contingent conversion features. Upon closing of the initial public offering, these warrants were converted to warrants to purchase common stock and were reclassified to stockholders’ equity.

During 2013, the Company issued 47,791 shares of common stock in connection with the cashless exercise of warrants to purchase stock. As a result, the warrants issued to Oxford, Mid-Cap and SVB were no longer outstanding as of December 31, 2013.