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Fair Value of Financial Instruments
6 Months Ended
Jun. 30, 2013
Fair Value of Financial Instruments [Abstract]  
Fair Value of Financial Instruments

2. Fair Value of Financial Instruments

The carrying amount of certain of the Company's financial instruments, including prepaid expenses and other current assets, deposits, accounts payable and accrued expenses and other payables approximate fair value due to their short maturities. The carrying value of the Company's notes payable and convertible notes payable approximated fair value because the interest rates under those obligations approximate market rates of interest available to the Company for similar instruments.

As a basis for determining the fair value of certain of the Company's financial instruments, the Company utilizes a three-tier value hierarchy, which prioritizes the inputs used in measuring fair value as follows:

Level I - Observable inputs such as quoted prices in active markets for identical assets or liabilities.

Level II - Observable inputs, other than Level I prices, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level III - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

This hierarchy requires the Company to use observable market data, when available, and to minimize the use of unobservable inputs when determining fair value. The Company's financial instruments that are measured at fair value on a recurring basis consist only of the preferred stock warrant liability. The Company's preferred stock warrant liability is classified within Level III of the fair value hierarchy.

The change in the fair value of the Level III preferred stock warrant liability is summarized below:

           

Fair value at December 31, 2012

 

$

92,150

 

 

Issuances

 

 

-

 

 

Change in fair value during the period

 

 

100,970

 

 

 

 

 

 

 

 

Fair value at June 30, 2013

 

$

193,120