Derivative Instruments (Details) (USD $)
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3 Months Ended | 9 Months Ended | |||
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Sep. 30, 2011
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Dec. 31, 2011
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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]
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Class of Warrant or Right [Line Items] | |||||
Warrants exercised | 1,578,948 | ||||
Series DD Warrants [Member]
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Class of Warrant or Right [Line Items] | |||||
Warrants exercised | 1,578,948 | ||||
Series V Warrants [Member]
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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]
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Class of Warrant or Right [Line Items] | |||||
Warrants exercised | 60,000 |