At September 30, 2015, there were warrants outstanding to purchase 1,969,250 shares of common stock with a weighted average exercise price of $0.97 and a weighted average remaining life of 3.6 years. During the nine months ended September 30, 2015, warrants to purchase 11,615,674 shares of common stock were exercised for net proceeds (See Note 8) of $10,817,326.  No warrants were exercised during the nine months ended September 30, 2014. Additionally, in accordance with the warrant agreements, warrants to purchase 371,250 shares of common stock were exercised in cashless exercises resulting the issuance of 255,724 shares.  There were no warrants issued or cancelled during the nine months ended September 30, 2015. During the nine months ended September 30, 2014, the Company issued warrants to purchase 13,435,373 shares of common stock. No warrants were cancelled during the nine months ended September 30, 2014.