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Income taxes - Components of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2024
--- | --- | --- | ---
Deferred tax assets: |  |  |
Net operating loss carryforwards | $ 267,196 | $ 192,909 |
Research and development credits | 15,144 | 2,676 |
Property, plant and equipment | 4,735 | 4,596 |
Capitalized start-up costs | 873 | 1,014 |
Stock compensation | 20,297 | 16,478 |
Accrued expenses | 5,595 | 6,397 |
Lease liability | 6,931 | 7,318 |
Other | 120 | 0 |
Total deferred tax assets | 320,891 | 231,388 |
Valuation allowance | (312,035) | (221,629) | $ (161,890)
Net deferred tax assets | 8,856 | 9,759 |
Deferred tax liabilities: |  |  |
Right of use asset | (8,856) | (9,698) |
Other | 0 | (61) |
Total deferred tax liabilities | (8,856) | (9,759) |
Net deferred tax assets (liabilities) | $ 0 | $ 0 |

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