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Summary of Significant Accounting Policies - Reverse Stock Split (Details)
Sep. 30, 2012
Dec. 31, 2011
Jul. 30, 2012
Scenario, Previously Reported [Member]
Jul. 30, 2012
Reverse Stock Split [Member]
Significant Account Policies [Line Items]        
Common stock, shares authorized (shares) 12,500,000 12,500,000 500,000,000 12,500,000