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Fair value of financial assets and liabilities (Details) - Recurring - USD ($) $ in Thousands	Sep. 30, 2022	Mar. 31, 2022
Fair value of financial assets and liabilities
Assets fair value	$ 326,060	$ 364,824
Money market funds
Fair value of financial assets and liabilities
Assets fair value	43,170	75,117
US Government Agency bonds
Fair value of financial assets and liabilities
Assets fair value	46,944	26,688
US Treasury bonds
Fair value of financial assets and liabilities
Assets fair value	235,946	263,019
Level 1
Fair value of financial assets and liabilities
Assets fair value	0	0
Level 1 | Money market funds
Fair value of financial assets and liabilities
Assets fair value	0	0
Level 1 | US Government Agency bonds
Fair value of financial assets and liabilities
Assets fair value	0	0
Level 1 | US Treasury bonds
Fair value of financial assets and liabilities
Assets fair value	0	0
Level 2
Fair value of financial assets and liabilities
Assets fair value	326,060	364,824
Level 2 | Money market funds
Fair value of financial assets and liabilities
Assets fair value	43,170	75,117
Level 2 | US Government Agency bonds
Fair value of financial assets and liabilities
Assets fair value	46,944	26,688
Level 2 | US Treasury bonds
Fair value of financial assets and liabilities
Assets fair value	235,946	263,019
Level 3
Fair value of financial assets and liabilities
Assets fair value	0	0
Level 3 | Money market funds
Fair value of financial assets and liabilities
Assets fair value	0	0
Level 3 | US Government Agency bonds
Fair value of financial assets and liabilities
Assets fair value	0	0
Level 3 | US Treasury bonds
Fair value of financial assets and liabilities
Assets fair value	$ 0	$ 0

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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- Definition

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+ References

No definition available.

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