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