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Fair Value Measurement (Tables)
6 Months Ended
Jun. 30, 2013
Fair Value Disclosures [Abstract]  
Financial Assets and Liabilities Measured at Fair Value

The following table presents financial assets and liabilities measured at fair value as of June 30, 2013:

 

     Fair Value Measurement
at Report Date Using
               
     Quoted Prices
in Active Markets
for
Identical Assets
(Level 1)
     Significant
Other
Observable
Inputs
(Level 2)
     Unobservable
Inputs
(Level 3)
     As of
June 30,
2013
 

Financial assets:

           

Cash equivalents:

           

Money market funds

   $ 521,269       $ —        $ —        $ 521,269   

U.S. Treasury debt obligations

     21,980,557         —          —          21,980,557   

Marketable securities:

           

Debt securities

     —          1,426,061         —          1,426,061   
  

 

 

    

 

 

    

 

 

    

 

 

 

Total financial assets

   $ 22,501,826       $ 1,426,061       $ —        $ 23,927,887   
  

 

 

    

 

 

    

 

 

    

 

 

 

Financial liabilities:

           

Bond obligation

   $ —        $ 231,250       $ —        $ 231,250   

Loan payable net of discounts

     —          —           9,586,188         9,586,188   

Warrant liabilities

     —          42,192         8,235,251         8,277,443   
  

 

 

    

 

 

    

 

 

    

 

 

 

Total financial liabilities

   $ —        $ 273,442       $ 17,821,439       $ 18,094,881   
  

 

 

    

 

 

    

 

 

    

 

 

Roll Forward for Financial Assets and Liabilities Measured at Fair Value Using Significant Other Observable Inputs (Level 2)

Level 2 Reconciliation

The following table presents a roll forward for financial assets and liabilities measured at fair value using significant other observable inputs (Level 2) for 2013:

 

     Level 2
Beginning
Balance 12/31/12
$
     Net transfers (to)
from
Level 1
$
    Change
included in
earnings
$
    Unrealized
gain
     Settled
$
    Level 2
Ending
Balance 06/30/13
$
 

Marketable securities

     13,900,678         (12,475,042     —         425         —         1,426,061   

Bond obligation

     331,250         —         —         —          (100,000     231,250   

Warrant liabilities

     107,968         —         (65,776     —          —         42,192   
  

 

 

    

 

 

   

 

 

   

 

 

    

 

 

   

 

 

 

Total

     14,339,896         (12,475,042 )     (65,776     425         (100,000 )     1,699,503   
  

 

 

    

 

 

   

 

 

   

 

 

    

 

 

   

 

 

 
Roll Forward for Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3)

Level 3 Reconciliation

The following table presents a roll forward for liabilities measured at fair value using significant unobservable inputs (Level 3) for 2013.

 

    Warrant
Liabilities
 

Balance at December 31, 2012

  $  9,157,397   

Less fair value of warrants exercised

    (418,841

Add change in fair value of warrants

    (503,305
 

 

 

 

Balance at June 30, 2013

  $ 8,235,251   
 

 

 

 

 

     Loan payable net of discounts  

Loan proceeds

   $  10,000,000   

Less discount

     (487,576

Add amortization of discount

     73,764   
  

 

 

 

Balance at June 30, 2013

   $ 9,586,188