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Stockholders' equity - ATM Program (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Aug. 03, 2023
Jun. 23, 2022
Aug. 11, 2020
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Sep. 30, 2022
Sep. 30, 2023
Mar. 31, 2023
Class of Warrant or Right [Line Items]                  
Common stock, par value (in dollars per share)               $ 0.001 $ 0.001
Number of shares issued (in shares)       6,810,658,000          
Shares issued during period (in shares)         340,000   340,000    
Proceeds from issuance of common stock through ATM sales, net of offering costs       $ 242.6 $ 6.7   $ 6.7    
Issuance costs and underwriter fees         $ 0.3   $ 0.3    
Common stock                  
Class of Warrant or Right [Line Items]                  
Shares issued during period (in shares)         340,000 1,686,438      
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]                  
Aggregate offering amount         $ 32.0        
Common stock, par value (in dollars per share) $ 0.001 $ 0.001 $ 0.001            
Number of shares issued (in shares)         1,686,438        
Underwriting discounts, commissions and other offering expenses         $ 1.0        
Maximum received on transaction $ 250.0 $ 100.0              
ATM Program | Maximum | Common stock                  
Class of Warrant or Right [Line Items]                  
Aggregate offering amount     $ 62.5