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Subsequent events (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Oct. 02, 2020
Apr. 30, 2021
Mar. 31, 2021
Subsequent events      
Offering expenses     $ 1,800
Shares issued     58,775
At the market offering      
Subsequent events      
Gross proceeds before discounts and commissions     110,600
Net proceeds     106,900
Offering expenses     $ 3,700
At the market offering | Sales Agreement | Maximum      
Subsequent events      
Aggregate offering price $ 75,000    
At the market offering | Sales Agreement | Subsequent events      
Subsequent events      
Shares sold (in shares)   482,299  
Gross proceeds before discounts and commissions   $ 14,400  
Net proceeds   14,000  
Offering expenses   400  
Shares issued   $ 75,000