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Subsequent events (Details) - USD ($)
$ / shares in Units, $ in Millions
Oct. 16, 2020
Sep. 30, 2020
Dec. 31, 2019
Subsequent events [Abstract]      
Common stock, par value (in dollars per share)   $ 0.01 $ 0.01
Subsequent Event [Member]      
Subsequent events [Abstract]      
Common stock, par value (in dollars per share) $ 0.01    
Shares sold in Public Offering (in shares) 1,380,000    
Public offering price (in dollars per share) $ 7.10    
Discount rate applied to public offering price for Underwriters 6.00%    
Proceeds from Public Offering $ 8.7    
Subsequent Event [Member] | Overallotment Option [Member]      
Subsequent events [Abstract]      
Shares sold in Public Offering (in shares) 180,000