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Fair value of financial assets and liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Mar. 31, 2025
--- | --- | ---
Fair value of financial assets and liabilities |  |
Short-term investments: | $ 180,138 | $ 462,564
Money market funds |  |
Fair value of financial assets and liabilities |  |
Cash equivalents: | 104,275 | 89,879
US Government Agency bonds |  |
Fair value of financial assets and liabilities |  |
Cash equivalents: | 15,998 |
Short-term investments: | 3,984 | 84,804
US Treasury bonds |  |
Fair value of financial assets and liabilities |  |
Short-term investments: | 55,881 | 287,881
Level 1 |  |
Fair value of financial assets and liabilities |  |
Short-term investments: | 0 | 0
Level 1 | Money market funds |  |
Fair value of financial assets and liabilities |  |
Cash equivalents: | 0 | 0
Level 1 | US Government Agency bonds |  |
Fair value of financial assets and liabilities |  |
Cash equivalents: | 0 |
Short-term investments: | 0 | 0
Level 1 | US Treasury bonds |  |
Fair value of financial assets and liabilities |  |
Short-term investments: | 0 | 0
Level 2 |  |
Fair value of financial assets and liabilities |  |
Short-term investments: | 180,138 | 462,564
Level 2 | Money market funds |  |
Fair value of financial assets and liabilities |  |
Cash equivalents: | 104,275 | 89,879
Level 2 | US Government Agency bonds |  |
Fair value of financial assets and liabilities |  |
Cash equivalents: | 15,998 |
Short-term investments: | 3,984 | 84,804
Level 2 | US Treasury bonds |  |
Fair value of financial assets and liabilities |  |
Short-term investments: | 55,881 | 287,881
Level 3 |  |
Fair value of financial assets and liabilities |  |
Short-term investments: | 0 | 0
Level 3 | Money market funds |  |
Fair value of financial assets and liabilities |  |
Cash equivalents: | 0 | 0
Level 3 | US Government Agency bonds |  |
Fair value of financial assets and liabilities |  |
Cash equivalents: | 0 |
Short-term investments: | 0 | 0
Level 3 | US Treasury bonds |  |
Fair value of financial assets and liabilities |  |
Short-term investments: | $ 0 | $ 0

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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