The Company has warrants outstanding to purchase up to 1,651,698 and 1,685,032 at each of December 31, 2016 and 2015, respectively.

In connection with the sale of the Company’s Series A Convertible Preferred Stock in May 2014, Chardan Capital Markets LLC (“Chardan”) acted as sole placement agent in consideration for which it received a cash fee of $535,000 and a warrant to purchase up to 100,002 shares of the Company’s common stock. These warrants are exercisable immediately, have an exercise price of $6.00 per share, and have a five-year term.

In connection with the 2015 Private Placement, the Company issued to accredited investors warrants to purchase up to an aggregate of 1,443,362 shares of common stock for a purchase price of $3.00 per share. The warrants are exercisable into shares of common stock for a period of five (5) years from issuance at an initial exercise price of $3.30 per share, subject to adjustment in the event of stock splits, dividends and recapitalizations. The warrants are exercisable immediately. The Company is prohibited from effecting an exercise of the warrants to the extent that as a result of such exercise, the holder would beneficially own more than 4.99% (subject to increase up to 9.99% upon 61 days’ notice) in the aggregate of the issued and outstanding shares of common stock, calculated immediately after giving effect to the issuance of shares of common stock upon exercise of the warrant.

In connection with the 2015 Private Placement, Chardan acted as sole placement agent in consideration for which it received a cash fee of $300,000 and a warrant to purchase up to 141,668 shares of the Company’s common stock. These warrants are exercisable immediately, have an exercise price of $3.60 per share, and have a five-year term.

The following table summarizes the changes in the Company’s outstanding warrants during the year ended December 31, 2016: