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Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2012
Fair Value of Financial Instruments [Abstract]  
Assets and liabilities measured at fair value on a recurring basis
                         
    Level 1     Level 2     Level 3  

As of June 30, 2012:

                       

Investment in convertible notes

  $ —       $ —       $ 6,822  

Investment in RXT shares

    965       —         —    
       

As of December 31, 2011:

                       

Investment in convertible note

    —         —         5,770  

Investment in RXT shares

    556       —         —