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Stockholders' equity - Schedule of Pre-funded Warrants (Details) - shares | Sep. 30, 2023 | Mar. 31, 2023 | Dec. 01, 2022
--- | --- | --- | ---
Stock options, issued and outstanding |  |  |
Class of Warrant or Right [Line Items] |  |  |
Issuance of pre-funded warrants (in shares) | 9,155,387 | 7,454,828 |
Restricted stock units |  |  |
Class of Warrant or Right [Line Items] |  |  |
Issuance of pre-funded warrants (in shares) | 2,189,837 | 1,351,280 |
Stock options and restricted stock units, future issuance |  |  |
Class of Warrant or Right [Line Items] |  |  |
Issuance of pre-funded warrants (in shares) | 2,064,858 | 2,209,597 |
Employee stock purchase plan, available for future grants |  |  |
Class of Warrant or Right [Line Items] |  |  |
Issuance of pre-funded warrants (in shares) | 2,738,208 | 2,076,603 |
Pre-IPO warrants to purchase common stock |  |  |
Class of Warrant or Right [Line Items] |  |  |
Issuance of pre-funded warrants (in shares) | 497,344 | 497,344 |
Pre-funded warrants |  |  |
Class of Warrant or Right [Line Items] |  |  |
Issuance of pre-funded warrants (in shares) | 7,561,583 | 9,484,238 | 4,200,000,000
Total shares of common stock reserved for future issuance |  |  |
Class of Warrant or Right [Line Items] |  |  |
Issuance of pre-funded warrants (in shares) | 24,207,217 | 23,073,890 |

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