During an offering that ended on September 30, 2010, the Company issued convertible notes with an interest rate of 8% and an amended maturity date of March 31, 2011 (the “2010 Debt Obligations”). The Company incurred interest expense of $9,247 and $18,400 during the three and six months ended June 30, 2018, respectively, and $8,849 and $18,400 during the three and six months ended June 30, 2017, respectively, on the 2010 Debt Obligations. As of December 31, 2017, the entire principal balance owed on the 2010 Debt Obligations has been repaid, however, accrued interest of $273,881 and $255,481 remained outstanding as of June 30, 2018, and December 31, 2017, respectively. Accrued interest on the 2010 Debt Obligations is not convertible.

On December 31, 2017, the Company sold a convertible promissory note in the amount of $20,000 to an accredited investor. From February 2, 2018 through April 26, 2018, the Company sold additional convertible promissory notes in the aggregate principal amount of $2,026,730 (together, the “Convertible Notes”). The Convertible Notes mature 90 days from the date of issuance, bear interest at 8% per annum and are convertible into the Company’s common stock at a $0.63 per share, which represented a 10% discount to the price used for the sale of the Company’s common stock at the commitment date. The conversion option represented a beneficial conversion feature which was recorded as a debt discount with a corresponding credit to additional paid-in capital. The Company incurred total interest expense of $256,008, related to this debt during the three and six months ended June 30, 2018, of which $219,593 represented amortization of debt discount.

On June 30, 2018, principal and interest of $794,875 and $15,000, respectively, were converted into 1,285,516 shares of common stock at a conversion price of $0.63 per share.

The Company’s debt obligations as of June 30, 2018 and December 31, 2017 are summarized below:

[1] Accrued interest is included as a component of accrued expenses on the accompanying condensed consolidated balance sheets (see Note 7 – Accrued Expenses).