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Fair Value on Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2013
Fair Value of Financial Assets and Liabilities

The fair value of certain of the Company’s financial assets and liabilities were determined using the following inputs at December 31, 2013 (in thousands):

 

     Total      Quoted
Prices in
Active
Markets for
Identical
Assets
(Level 1)
     Significant
Other
Observable
Inputs
(Level 2)
     Significant
Unobservable
Inputs
(Level 3)
 

Money market funds(1)

   $ 8,650       $ 8,650       $       $   

Corporate debt securities(2)

   $ 23,173               $ 23,173           

United States government agency securities(2)

   $ 5,018               $ 5,018           
  

 

 

    

 

 

    

 

 

    

 

 

 

Total financial assets

   $ 36,841       $ 8,650       $ 28,191       $   
  

 

 

    

 

 

    

 

 

    

 

 

 

Warrant liability(3)

   $ 20,390       $       $       $ 20,390   
  

 

 

    

 

 

    

 

 

    

 

 

 

Total financial liabilities

   $ 20,390       $       $       $ 20,390   
  

 

 

    

 

 

    

 

 

    

 

 

 

 

(1) Included in cash and cash equivalents on the Company’s consolidated balances sheets.

 

(2) Included in short-term investments on the Company’s consolidated balance sheets.

 

(3) Included in current liabilities on the Company’s consolidated balance sheets.

 

The fair values of certain of the Company’s financial assets and liabilities were determined using the following inputs at December 31, 2012 (in thousands):

 

     Total      Quoted
Prices in
Active
Markets for
Identical
Assets
(Level 1)
     Significant
Other
Observable
Inputs
(Level 2)
     Significant
Unobservable
Inputs
(Level 3)
 

Money market funds(1)

   $ 10,268       $ 10,268       $       $   
  

 

 

    

 

 

    

 

 

    

 

 

 

Total financial assets

   $ 10,268       $ 10,268       $       $   
  

 

 

    

 

 

    

 

 

    

 

 

 

Warrant liability(2)

   $ 5,903       $       $       $ 5,903   
  

 

 

    

 

 

    

 

 

    

 

 

 

Total financial liabilities

   $ 5,903       $       $       $ 5,903   
  

 

 

    

 

 

    

 

 

    

 

 

 

 

(1) Included in cash and cash equivalents on the Company’s consolidated balance sheets.

 

(2) Included in current liabilities on the Company’s consolidated balance sheets.
Reconciliation of Fair Value Measurement on Liabilities Using Significant Unobservable Inputs

A reconciliation of the beginning and ending balances for warrant liability using significant unobservable inputs (Level 3) from December 31, 2011 to December 31, 2013 was as follows (in thousands):

 

Balance at December 31, 2011

   $ 7,979   

Decrease in fair value of warrants

     (2,059

Settlement of warrants exercised

     (17
  

 

 

 

Balance at December 31, 2012

     5,903   

Increase in fair value of warrants

     15,099   

Settlement of warrants exercised

     (612
  

 

 

 

Balance at December 31, 2013

   $ 20,390