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Stockholders' equity - ATM Program (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 23, 2022
Aug. 11, 2020
Jun. 30, 2022
Sep. 30, 2022
Mar. 31, 2022
Class of Warrant or Right [Line Items]          
Common stock, par value (in dollars per share)       $ 0.001 $ 0.001
ATM Program          
Class of Warrant or Right [Line Items]          
Securities issued $ 400.0        
Percentage of commission   3.00%      
ATM Program | Common stock          
Class of Warrant or Right [Line Items]          
Number of shares issued (in shares)     0 1,686,438  
Aggregate offering amount       $ 32.0  
Underwriting discounts, commissions and other offering expenses       $ 1.0  
Common stock, par value (in dollars per share) $ 0.001 $ 0.001      
Maximum received on transaction $ 100.0        
ATM Program | Maximum | Common stock          
Class of Warrant or Right [Line Items]          
Aggregate offering amount   $ 62.5