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Subsequent events (Details)
$ / shares in Units, $ in Thousands
1 Months Ended
Oct. 31, 2019
USD ($)
$ / shares
shares
Sep. 30, 2019
shares
Dec. 31, 2018
shares
Subsequent events      
Common stock, outstanding   1,181,733 1,155,366
Subsequent Event | IPO      
Subsequent events      
Gross proceeds from issuance | $ $ 97,750    
Common stock, outstanding 20,726,532    
Common stock, outstanding, shares held by related parties 3,365,000    
Subsequent Event | Common Stock | IPO      
Subsequent events      
Shares issued 6,516,667    
Offering price per share | $ / shares $ 15.00    
Common stock ratio 1    
Subsequent Event | Common Stock | Over-Allotment Option      
Subsequent events      
Shares issued 850,000