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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 |  |  |  |  |  |

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