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Short-term investments (Details) - Short-term investments - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Short-term investments |  |
Amortized cost | $ 293,739 | $ 108,732
Gross unrealized gains | 67 | 388
Gross unrealized losses | (22) | (65)
Fair value | 293,784 | 109,055
Commercial paper |  |
Short-term investments |  |
Amortized cost |  | 21,818
Gross unrealized gains |  | 66
Fair value |  | 21,884
US Government Agency bonds |  |
Short-term investments |  |
Amortized cost | 67,017 | 15,217
Gross unrealized gains | 12 | 78
Gross unrealized losses | (17) |
Fair value | 67,012 | 15,295
US Treasury bonds |  |
Short-term investments |  |
Amortized cost | 226,722 | 35,590
Gross unrealized gains | 55 | 220
Gross unrealized losses | (5) |
Fair value | $ 226,772 | 35,810
Corporate debt securities |  |
Short-term investments |  |
Amortized cost |  | 36,107
Gross unrealized gains |  | 24
Gross unrealized losses |  | (65)
Fair value |  | $ 36,066

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