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Stockholders' equity - Equity offerings (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Oct. 31, 2020
Jun. 30, 2020
Sep. 30, 2022
Sep. 30, 2022
Sep. 30, 2021
Nov. 30, 2019
Jul. 09, 2018
Class of Warrant or Right [Line Items]              
Net proceeds from issuance after deducting underwriting discounts, commissions and other offering expenses $ 269,975 $ 107,782 $ 6,700 $ 37,438 $ 0    
Shares issued during period (in shares)     340,000        
Number of stock warrants issued (in shares) 2,200,000 3,084,238       5,284,238 5,284,238
Underwriter rights              
Class of Warrant or Right [Line Items]              
Number of shares issued (in shares) 5,625,000,000 3,478,261          
Underwriting discounts, commissions and other offering expenses $ 17,525 $ 7,217          
Shares issued during period (in shares)   652,173          
Pre-Funded Warrants              
Class of Warrant or Right [Line Items]              
Number of days to purchase additional shares 30 days 30 days          
Issuance of pre-funded warrants (in shares) 1,562,500,000 1,521,738          
Share price (in dollars per share) $ 39.9999            
Pre-funded warrants exercise price (in dollars per share)   $ 22.9999          
Maximum percentage of holding for exercise warrants (as a percent) 9.99%     4.99%      
Maximum percentage of increase (decrease) of holding for exercise warrants (as a percent) 19.99%            
Shares issued during period (in shares) 937,500            
Prior notice period to change percentage of holding (in days) 61 days            
Price per share (in USD per share) $ 40.00 $ 23.00