Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments (Narrative) (Details)

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Derivative Instruments (Narrative) (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Derivative Instruments [Abstract]    
Non-cash income (expense) attributable to movement in fair value of derivative liabilities $ (93,000) $ (277,000)