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Shares Issued through Equity Offering Program (Details) - USD ($)
 6 Months Ended
Jul. 08, 2016
Mar. 20, 2014
Jun. 30, 2016
Shares issued through equity offering program      
Maximum aggregate sales price of shares to be sold under an Equity Offering Sales Agreement   $ 38,360,000  
Number of shares sold (in shares)     258,629
Proceeds from sale of shares, net of commission and before offering costs     $ 5,890,000
Payment of commissions on sale of shares     59,000
Payment of offering costs on sale of shares.     $ 83,000
Subsequent event      
Shares issued through equity offering program      
Number of shares sold (in shares) 34,144    
Proceeds from sale of shares, net of commission and before offering costs $ 813,000    
Payment of commissions on sale of shares $ 8,000