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Short-term investments (Tables)
6 Months Ended
Sep. 30, 2022
Short-Term Investments [Abstract]  
Schedule of short-term investments
As of September 30, 2022 and March 31, 2022, the Company's available-for-sale investments by type consisted of the following:
September 30, 2022
Amortized
cost
Gross unrealized
gains
Gross unrealized
losses
Credit LossesFair value
US Government agency bonds$47,268 $$(325)$— $46,944 
US Treasury bonds237,067 (1,126)— 235,946 
     Total$284,335 $$(1,451)$— $282,890 
March 31, 2022
Amortized costGross unrealized gainsGross unrealized lossesCredit LossesFair value
US Government agency bonds26,827 — (139)$— 26,688 
US Treasury bonds264,162 — (1,143)— 263,019 
     Total $290,989 $— $(1,282)$— $289,707