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Subsequent Events (Details) - USD ($)
 1 Months Ended 3 Months Ended
May 07, 2018
Mar. 31, 2018
Shares Issued Through Equity Offering Program    
Number of shares sold (in shares)   0
Subsequent event    
Shares Issued Through Equity Offering Program    
Number of shares sold (in shares) 10,600  
Proceeds from sale of shares, net of commission and before offering costs $ 254,000  
Payment of commissions on sale of shares $ 2,600