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Shares Issued Through Equity Offering Program (Details) - USD ($)
 6 Months Ended
Mar. 20, 2014
Jun. 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)   51,000
Proceeds from sale of shares, net of commission and before offering costs   $ 1,142,000
Payment of commissions on sale of shares   12,000
Payment of offering costs on sale of shares   $ 48,000