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Subsequent events (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Jul. 07, 2020
Jun. 05, 2020
Jun. 30, 2019
Subsequent events      
Offering expenses     $ 8.4
At the market offering      
Subsequent events      
Maximum aggregate offering price   $ 50.0  
At the market offering | Subsequent events      
Subsequent events      
Shares issued (in shares) 1,192,713    
Share issue price $ 15.50    
Gross proceeds before discounts and commissions $ 18.5    
Net proceeds 17.6    
Offering expenses $ 0.9