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Subsequent event (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Oct. 27, 2017
Sep. 30, 2017
Sep. 30, 2016
Subsequent event      
Gross proceeds received from public offering   $ 1,036 $ 2,218
Subsequent events      
Subsequent event      
Shares issued in connection with offering 5,000,000    
Offering price per share of shares issued $ 18.25    
Gross proceeds received from public offering $ 91,300    
Net proceeds received from public offering $ 85,400    
Options granted to underwriters 750,000