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v3.26.1

Income taxes - Reconciliation of the U.S federal statutory income tax rate including percent (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Amount |  |
Pre tax loss | $ (314,491) | $ (246,829)
U.S. Federal statutory tax rate | (66,043) |
State and local income taxes, net of federal benefit | (2,516) |
Federal R&D credit | (15,381) |
Other | (788) |
Stock compensation | 2,204 |
Changes in unrecognized tax benefits | 9,537 |
Total | $ (551) | $ 468
Percent |  |
U.S. Federal statutory tax rate | 21.00% | 21.00%
State and local income taxes, net of federal benefit | 0.80% | 0.50%
Change in valuation allowance |  | (24.30%)
Statutory tax rate difference between U.K. and U.S. |  | 3.60%
Other |  | (1.00%)
Federal R&D credit | 4.90% | 1.60%
Other | 0.30% |
Stock compensation | (0.70%) | (1.20%)
Changes in unrecognized tax benefits | (3.00%) |
Total | 0.20% | 0.20%
United Kingdom |  |
Amount |  |
Change in valuation allowance | $ 63,295 |
Statutory tax rate difference between U.K. and U.S. | (9,938) |
Other | $ (1,186) |
Percent |  |
Change in valuation allowance | (20.10%) |
Statutory tax rate difference between U.K. and U.S. | 3.20% |
Other | 0.40% |
United States |  |
Amount |  |
Change in valuation allowance | $ 20,265 |
Percent |  |
Change in valuation allowance | (6.40%) |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.1.Q1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479360/740-10-S99-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 + Details
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