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Shares Issued Through Equity Offering Program (Details) - USD ($)
 9 Months Ended
Oct. 07, 2015
Mar. 20, 2014
Sep. 30, 2015
Shares Issued Through Equity Offering Program      
Maximum aggregate sales price of shares to be sold under an Equity Offering Sales Agreement (in dollars)   $ 38,360,000  
Number of shares sold (in shares) 33,103   135,000
Proceeds from sale of shares, net of commission and before offering costs $ 725,200   $ 3,013,400
Payment of commissions on sale of shares $ 7,300   30,400
Payment of offering costs on sale of shares     $ 79,000