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Fair value of financial instruments (Tables)
3 Months Ended
Mar. 31, 2013
Fair Value Disclosures [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 March 31, 2013:

 

    Fair value measurement using  
    Carrying value     Level 1     Level 2     Level 3     Total  
Derivative warrant - liability   $ 5,044     $ -     $ -     $ 5,044     $ 5,044  

 

Financial assets and liabilities measured at fair value on a recurring basis are summarized below and disclosed on the consolidated balance sheets as of December 31, 2012:

 

    Fair value measurement using  
    Carrying value     Level 1     Level 2     Level 3     Total  
Derivative warrant - liability   $ 7,166     $ -     $ -     $ 7,166     $ 7,166
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

The table below provides a summary of the changes in fair value, including net transfers in and/or out, of all financial assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the three months ended March 31, 2013:

 

 

    Fair Value Measurement
Using Level 3 Inputs
 
    Derivatives     Total  
Balance, December 31, 2012   $ 7,166     $ 7,166  
Total (gains) or losses (realized/unrealized) included in consolidated statements of operations     (2,122 )     (2,122 )
Purchases, issuances and settlements     -       -  
Transfers in and/or out of Level 3     -       -  
Balance, March 31, 2013   $ 5,044     $ 5,044