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Assets and Liabilities Measured at Fair Value (Tables)
9 Months Ended
Sep. 30, 2013
Assets and Liabilities Measured at Fair Value [Abstract]  
Schedule of fair value of the warrants
 
The fair value of the Warrants totaled $0.9 million at September 30, 2013 and was determined by using an option pricing model assuming the following:
 
 
2012
Warrants
 
 
2009
Warrants
 
Expected volatility
 
 
93.89
%
 
 
105.91
%
Risk-free interest rates
 
 
0.27
%
 
 
0.07
%
Expected life (in years)
 
 
1.75
 
 
 
0.75
 
 
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 September 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 September 30, 2013
(in thousands)

 
Level 1
 
Level 2
 
Level 3
 
Balance at
September 30,
2013
 
Assets
 
 
 
 
Money market funds
 
$
1,956
  
$
  
$
  
$
1,956
 
Liabilities
                
Warrant liability
 
$
  
$
  
$
863
  
$
863
 
 
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
  
(2,345
)
Fair value of warrants exercised
  
(219
)
Ending balance as of September 30, 2013
 
$
863