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Shares Issued through Equity Offering Program (Details) (USD $)
 0 Months Ended 6 Months Ended
Mar. 20, 2014
Jun. 30, 2014
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  
Shares issued through equity offering program    
Number of shares sold   156,172
Proceeds from sale of shares, net of commission and before offering costs   3,402,000
Payment of commissions on sale of shares   34,000
Payment of offering costs, primarily professional fees, on sale of shares   $ 98,000