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

Principal amount outstanding at December 31, 2011

   $ 277,216  

Borrowings

     6,250  

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

  

 

11,876

  

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

  

 

(77,200

) 
   

 

 

  

Principal amount outstanding at June 30, 2012

   $ 218,142