In June 2010, the FASB issued authoritative guidance on determining whether an instrument (or embedded feature) is indexed to an entity’s own stock. Under the authoritative guidance, effective January 1, 2010, instruments which do not have fixed settlement provisions are deemed to be derivative instruments. The strike price of the warrants issued by the Company, in connection with certain convertible note offerings made during 2009 and 2010, in the aggregate of 8,522,500 warrants, exercisable at $0.30 per share, contains exercise prices that may fluctuate based on the occurrence of future offerings or events. As a result, these warrants were not considered indexed to the Company’s own stock. The Company characterized the fair value of these warrants as derivative liabilities upon issuance. The FASB’s guidance requires the fair value of these liabilities be re-measured at the end of every reporting period with the change in value reported in the accompanying statement of operations. At December 31, 2012, a total of 4,412,500 warrants remain outstanding with a fair value of $3,221,138.

In January 2013, 4,112,500 warrants were exercised and the remaining 300,000 warrants expired unexercised at which time the warrants had a fair value of $3,441,752, which resulted in a loss of $220,614 due to the change in the fair value. Furthermore, as a result of the exercise and expiration of these warrants, the Company recorded a gain of $3,441,752 due to the extinguishment of the corresponding derivative liability.

The derivative liabilities were valued using a probability weighted average series of Black-Scholes-Merton models as a valuation technique, which approximates the Monte Carlo and other binominal valuation techniques with the following assumptions:

The risk-free interest rate is based on the yield available on U.S. Treasury securities. The Company estimates volatility based on the historical volatility of its common stock. The expected life warrants are based on the expiration date of the related warrants. The expected dividend yield was based on the fact that the Company has not paid dividends to stockholders in the past nor is it expected to pay any dividends in the foreseeable future.