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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2012
Changes in Warrant Liabilities

A summary of changes in the Warrant Liabilities is as follows:

 

     Fair Value of
Warrant
Liabilities		  
     (in thousands)  

Balance December 31, 2010

    $ 861   

Change in fair value of warrant liabilities

      524   

Intrinsic value of liability warrants exercised

      (1,385 ) 
  

 

 

  

Balance December 31, 2011

    $ —