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Fair Value of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2012
Derivative Financial Liabilities Measured and Recorded at Fair Value on Consolidated Balance Sheets on Recurring Basis
The following table presents the derivative financial instruments, Opexa’s only financial liabilities measured and recorded at fair value on the Company’s consolidated balance sheets on a recurring basis, and their level within the fair value hierarchy as of September 30, 2012:
 
      September 30, 2012     Level 1       Level 2       Level 3  
Warrant derivative liabilities
  $
2,451,524
  $
 -
    $
-
   
$
 2,451,524
 
Total
  $
         2,451,524
  $
 -
    $
-
   
$
2,451,524
 
Changes in Fair Value of Derivative Financial Instruments Measured at Fair Value on Recurring Basis using Significant Unobservable Inputs
The following table provides a summary of the changes in fair value, including net transfers in and/or out, of the derivative financial instruments, measured at fair value on a recurring basis using significant unobservable inputs:

Balance at December 31, 2011
  $ -  
Fair value of warrant derivative liabilities at issuance
  $ 2,314,635  
Unrealized derivative losses included in other income (expense)
  $ 136,889  
Balance at September 30, 2012
  $ 2,451,524  
Variables used in Lattice Option Pricing Model for Derivative Liabilities
The variables used in the Lattice option pricing model for the derivative liabilities during the nine months ended September 30, 2012 include:

 
July 25, 2012
September 30, 2012
Market value of common stock on measurement date
$0.64
$0.68
Projected exercise price
$1.25
$1.13
Risk free interest rate
0.56%
0.56%
Warrant lives in years
5
4.88
Expected volatility
193%
193%
Expected dividend yields
0%
0%
Offering price range
$0.64-$1.64
$0.68-$1.68