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Shares Issued through Equity Offering Program (Details) (USD $)
 0 Months Ended 3 Months Ended 0 Months Ended
Mar. 20, 2014
Mar. 31, 2014
Apr. 04, 2014
Subsequent event
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   32,844 26,262
Proceeds from sale of shares, net of commission and before offering costs   720,000 573,300
Payment of commissions on sale of shares   7,000 6,000
Payment of offering costs, primarily professional fees, on sale of shares   $ 76,000