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Related-party arrangements (Tables)
9 Months Ended
Sep. 30, 2012
Related-party arrangements [Abstract]  
Schedule of principal amount outstanding under loan arrangement
         

Principal amount outstanding at December 31, 2011

  $ 277,203  

Borrowings

    11,250  

Capitalization of accrued and unpaid interest due and payable as of June 27, 2012

    11,876  

Reduction of principal indebtedness related to the issuance of common stock pursuant to common stock purchase agreement completed on June 27, 2012

    (77,187
   

 

 

 

Principal amount outstanding at September 30, 2012

  $ 223,142