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Shares Issued Through Equity Offering Program (Details) (USD $)
 0 Months Ended 2 Months Ended 12 Months Ended
Aug. 09, 2012
Sep. 30, 2012
Dec. 31, 2011
Shares Issued Through Equity Offering Program      
Maximum aggregate sales price of shares to be sold under an Equity Offering Sales Agreement (in dollars) $ 50,000,000    
Number of shares sold   120,844  
Proceeds from sale of shares   2,296,041 40,569,000
Payment of commissions on sale of shares   23,000  
Payment of offering costs on sale of shares   $ 143,000