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Assets and Liabilities Measured at Fair Value (Tables)
6 Months Ended
Jun. 30, 2013
Assets and Liabilities Measured at Fair Value [Abstract]  
Schedule of fair value of the warrants
The fair value of the Warrants at June 30, 2013 totaled $0.4 million at June 30, 2013 and was determined by using an option pricing model assuming the following:

 
 
2012 Warrants
  
2009 Warrants
 
Expected volatility
  
91.75
%
  
95.60
%
Risk-free interest rates
  
0.36
%
  
0.15
%
Expected life (in years)
  
2.00
   
1.00
 

Assets and liabilities measured at fair value on a recurring basis
The table below presents the Company’s assets and liabilities measured at fair value on a recurring basis as of June 30, 2013, aggregated by the level in the fair value hierarchy within which those measurements fall:

Assets and Liabilities Measured at Fair Value on a Recurring Basis at June 30, 2013
(in thousands)

 
 
Level 1
  
Level 2
  
Level 3
  
Balance at
June 30,
2013
 
Assets
 
  
  
  
 
Money market funds
 
$
1,956
  
$
  
$
  
$
1,956
 
Liabilities
                
Warrant liability
 
$
  
$
  
$
366
  
$
366
 

Fair value measurements using significant unobservable inputs
Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
(in thousands)

 
 
Warrant Liability
 
Beginning balance as of December 31, 2012
 
$
3,427
 
Total change in the liability included in earnings
  
(2,842
)
Fair value of warrants exercised
  
(219
)
Ending balance as of June 30, 2013
 
$
366