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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 |  |  |  |  |

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