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Stockholders' equity - ATM Program (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jun. 23, 2022
Aug. 11, 2020
Dec. 31, 2022
Oct. 31, 2020
Jun. 30, 2020
Nov. 30, 2019
Jun. 30, 2022
Mar. 31, 2023
Jun. 30, 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 5,625,000,000 3,478,261 4,516,561      
Shares issued during period (in shares)               340,000  
Proceeds from issuance of common stock through ATM sales, net of offering costs     $ 242,600 $ 270,000 $ 107,800 $ 85,600   $ 6,700  
Issuance costs and underwriter fees               $ 300  
Common stock                  
Class of Warrant or Right [Line Items]                  
Shares issued during period (in shares)             1,686,438    
ATM Program                  
Class of Warrant or Right [Line Items]                  
Securities issued $ 400,000                
Percentage of commission   3.00%              
ATM Program | Common stock                  
Class of Warrant or Right [Line Items]                  
Aggregate offering amount             $ 32,000    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001              
Number of shares issued (in shares)             1,686,438    
Underwriting discounts, commissions and other offering expenses             $ 1,000    
Maximum received on transaction $ 93,300                
ATM Program | Maximum | Common stock                  
Class of Warrant or Right [Line Items]                  
Aggregate offering amount   $ 62,500