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Stockholders' equity - ATM Program (Details) - USD ($)
$ / shares in Units, $ in Millions
Jun. 14, 2024
Aug. 03, 2023
Aug. 11, 2020
Jun. 30, 2024
Mar. 31, 2024
Class of Warrant or Right [Line Items]          
Aggregate offering amount $ 96.7        
Common stock, par value (in dollars per share)       $ 0.001 $ 0.001
ATM Program          
Class of Warrant or Right [Line Items]          
Percentage of commission     3.00%    
ATM Program | Common stock          
Class of Warrant or Right [Line Items]          
Common stock, par value (in dollars per share)   $ 0.001      
Maximum received on transaction   $ 100.0