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Shares Issued through Equity Offering Program (Details) - USD ($)
 1 Months Ended 2 Months Ended 3 Months Ended
May 10, 2017
Jul. 31, 2017
Jun. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
2014 Agreement          
Shares issued through equity offering program          
Number of shares sold (in shares)       0 27,800
Proceeds from sale of shares, net of commission and before offering costs         $ 692,000
Payment of commissions on sale of shares         7,000
Payment of offering costs on sale of shares.         $ 16,000
2017 Agreement          
Shares issued through equity offering program          
Maximum aggregate sales price of shares to be sold under an Equity Offering Sales Agreement $ 50,000,000        
Number of shares sold (in shares)   5,806 4,200    
Proceeds from sale of shares, net of commission and before offering costs   $ 137,000 $ 99,000    
Payment of commissions on sale of shares   $ 1,400 1,000    
Payment of offering costs on sale of shares.     $ 126,000