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Stockholders' equity - Equity offerings (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Sep. 30, 2022
Sep. 30, 2023
Mar. 31, 2023
Dec. 01, 2022
Class of Warrant or Right [Line Items]            
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, net of underwriting fees and discounts $ 242.6 $ 6.7 $ 6.7      
Pre-funded warrants            
Class of Warrant or Right [Line Items]            
Number of days to purchase additional shares 30 days          
Price per share (in USD per share) $ 23.50          
Issuance of pre-funded warrants (in shares)       7,561,583 9,484,238 4,200,000,000
Share price (in dollars per share) $ 23.4999          
Underwriter rights            
Class of Warrant or Right [Line Items]            
Shares issued during period (in shares) 1,436,172,000          
Underwriting discounts, commissions and other offering expenses $ 16.1