Related to convertible notes payable and underlying warrants

As discussed in Note 5 under Bridge Financing, we previously issued convertible notes payable that provided for the issuance of warrants to purchase our common stock at a future date. The conversion term for the convertible notes was variable based on certain factors. The number of warrants to be issued was based on the future price of our common stock.

As of December 31, 2012 and through June 17, 2013, the number of warrants to be issued was indeterminate. Due to the fact that the number of warrants issuable was indeterminate, the equity environment was tainted. Because the equity environment was tainted, we accounted for the variable maturity conversion feature (“VMCO”) and the additional share issuance feature (“ASID”) contained in the convertible notes payable as derivative liabilities on the issuance date of the convertible notes payable.

On June 17, 2013, we converted all of the outstanding convertible notes payable into shares of our common stock, and issued the warrants underlying the convertible notes payable. At that time, the taint on the equity environment was removed, and the derivative liabilities related to the VMCO and ASID totaling $7,792,657 were reclassified to equity.

Related to private placement shares and warrants

We completed a private placement in September 2011 for the sale of units consisting of shares of common stock and warrants to purchase our common stock. Both the common shares and the warrants contain anti-dilutive, or down round, price protection. We recorded derivative liabilities related to the down round price protection on the common shares and the warrants at the issuance date.

The down round price protection on the common shares in 2012 and the down round protection for the warrant terminates when the warrant expires or is exercised.

Our derivative liabilities at December 31, 2014 relate to these warrants.

Related to allonges

As discussed in Note 5 under Bridge Financing, all note holders with convertible notes payable maturing in February 2012 extended the maturity date through May 2012. As consideration to the note holders for the extension of the maturity date, we provided allonges which consisted of the accrued interest on each convertible note payable as of January 31, 2012. The allonges were convertible into shares of common stock at the latest financing price. The value of the allonges was recorded as a derivative liability at the issuance date.

In June 2013, the number of common shares issuable under the allonges was determined to be 87,947 and these shares were issued in July 2013.

Related to non-employee warrants

As discussed in Note 8, we previously accounted for warrants issued to non-employees as derivative liabilities. On June 17, 2013, the equity environment was no longer tainted and the value of the derivative liabilities related to the non-employee warrants totaling $176,555 was reclassified to equity.

Summary

The fair values of our derivative liabilities are estimated at the issuance date and are revalued at each subsequent reporting date using a Monte Carlo simulation discussed below.

At December 31, 2014 and 2013, we recorded current derivative liabilities of $42,659 and $106,176, respectively, which are detailed by instrument type in the table below.

The net change in fair value of the derivative liabilities for the years ended December 31, 2014 and 2013 was a loss of $63,517 and a gain of $3,766,231, respectively.

The following table presents the derivative liabilities by instrument type as of December 31, 2014 and 2013:

The following table presents details of the Company’s derivative liabilities from December 31, 2012 to December 31, 2014:

An independent valuation expert calculated the fair value of the compound embedded derivatives using a complex, customized Monte Carlo simulation model suitable to value path dependent American options. The model uses the risk neutral methodology adapted to value corporate securities. This model utilized subjective and theoretical assumptions that can materially affect fair values from period to period.

Key inputs and assumptions used in valuing our derivative liabilities are as follows:

For issuances of notes, common stock and warrants:

For issuances of non-employee warrants through June 17, 2013:

See Note 10 for a discussion of fair value measurements.