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Fair Value of Financial Instruments
9 Months Ended
Sep. 30, 2013
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments

7. Fair Value of Financial Instruments

The FASB’s authoritative guidance on fair value measurements establishes a framework for measuring fair value, and expands disclosure about fair value measurements. This guidance enables the reader of the financial statements to assess the inputs used to develop those measurements by establishing a hierarchy for ranking the quality and reliability of the information used to determine fair values. Under this guidance, assets and liabilities carried at fair value must be classified and disclosed in one of the following three categories:

Level 1: Quoted market prices in active markets for identical assets or liabilities.

Level 2: Observable market based inputs or unobservable inputs that are corroborated by market data.

Level 3: Unobservable inputs that are not corroborated by market data.

In determining the appropriate levels, the Company performs a detailed analysis of the assets and liabilities that are measured and reported on a fair value basis. At each reporting period, all assets and liabilities for which the fair value measurement is based on significant unobservable inputs are classified as Level 3. The fair value of certain of the Company’s financial instruments, including Cash and cash equivalents and Accounts payable, approximates the carrying value due to the relatively short maturity of such instruments. The fair value of derivative instruments is determined by management with the assistance of an independent third party valuation specialist. The warrant liability is a derivative instrument and is classified as Level 3. The Company used the Monte-Carlo Simulation model to estimate the fair value of the warrants. Significant assumptions used at March 31, 2013 for the 2010 warrants include a weighted average term of 2.0 years, a 5% probability that the warrant exercise price would be reset, volatility range of 58.0% to 59.1% and a risk free interest rate of 0.25%. Significant assumptions used at June 30, 2013 for the 2010 warrants include a weighted average term of 1.7 years, a 5% probability that the warrant exercise price would be reset, volatility range of 55.7% to 56.5% and a risk free interest rate of 0.36%. Significant assumptions used at September 30, 2013 for the 2010 warrants include a weighted average term of 1.5 years, a 5% probability that the warrant exercise price would be reset, volatility range of 59.0% to 59.4% and a risk free interest rate of 0.33%. Significant assumptions used at March 31, 2013 for the 2011 warrants include a weighted average term of 2.8 years, a 5% probability that the warrant exercise price would be reset, volatility range of 58.0% to 59.1% and a risk free interest rate of 0.25%. Significant assumptions used at June 30, 2013 for the 2011 warrants include a weighted average term of 2.5 years, a 5% probability that the warrant exercise price would be reset, volatility of 59.1% and a risk free interest rate of 0.66%. Significant assumptions used at September 30, 2013 for the 2011 warrants include a weighted average term of 2.3 years, a 5% probability that the warrant exercise price would be reset, volatility of 58.6% and a risk free interest rate range of 0.33% to 0.63%. Significant assumptions used at March 31, 2013 for the 2013 warrants include a weighted average term of 4.9 years, a 5% probability that the warrant exercise price would be reset, volatility range of 58.0% to 66.7% and a risk free interest rate range of 0.25% to 0.77%. Significant assumptions used at June 30, 2013 for the 2013 warrants include a weighted average term of 4.7 years, a 5% probability that the warrant exercise price would be reset, volatility of 64.6% and a risk free interest rate of 1.41%. Significant assumptions used at September 30, 2013 for the 2013 warrants include a weighted average term of 4.4 years, a 5% probability that the warrant exercise price would be reset, volatility of 64.3% and a risk free interest rate of 1.39%.

 

The warrant liability measured at fair value on a recurring basis is as follows:

 

     Total      Level 1      Level 2      Level 3  

Derivative instruments:

           

Warrant liability at September 30, 2013

   $ 3,514,622       $ —         $ —         $ 3,514,622   

Warrant liability at December 31, 2012

   $ 1,299,570       $ —         $ —         $ 1,299,570   

A reconciliation of the warranty liability measured at fair value on a recurring basis with the use of significant unobservable inputs (Level 3) from January 1, 2013 to September 30, 2013 follows:

 

Balance at January 1, 2013

   $  1,299,570   

Issuance of warrants

     1,297,950   

Net loss included in earnings

     917,102   

Exercise of warrants

     —     
  

 

 

 

Balance at September 30, 2013

   $ 3,514,622