Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments (Details)

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Derivative Instruments (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Derivative Instruments [Abstract]          
Non-cash income (expense) attributable to movement in fair value of derivative liabilities $ 284,000 $ 7,000 $ 7,000 $ (957,000)  
Estimated fair value of derivative liabilities 510,000   510,000   569,000
Class of Warrant or Right [Line Items]          
Reclassification to additional paid in capital       1,400,000  
Series CC Warrants [Member]
         
Class of Warrant or Right [Line Items]          
Warrants exercised       1,578,948  
Series DD Warrants [Member]
         
Class of Warrant or Right [Line Items]          
Warrants exercised       1,578,948  
Series V Warrants [Member]
         
Class of Warrant or Right [Line Items]          
Warrants exercised     20,000 810,000  
Reclassification to additional paid in capital     $ 52,000    
Series Z Warrants [Member]
         
Class of Warrant or Right [Line Items]          
Warrants exercised       60,000