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Derivative liability - warrants (restated) (Tables)
9 Months Ended
Sep. 30, 2012
Derivative Liability - Warrants [Abstract]  
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]

Financial assets and liabilities measured at fair value on a recurring basis are summarized below and disclosed on the consolidated balance sheets as of September 30, 2012:

 

    Fair value measurement using  
    Carrying value     Level I     Level II     Level III     Total  
Derivative warrant - liability   $ 935     $     $     $ 935     $ 935
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

 

  Fair value measurement
Using Level III inputs
 
  Derivatives     Total  
Balance, July 1, 2012   $ 1,461     $ 1,461  
Change in fair value of warrant liability     (623 )     (623 )
Issuance of additional warrants due to anti-dilution provision     97       97  
Transfers in and/or out of Level III            
Balance, September 30, 2012   $ 935     $ 935