Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2020	Mar. 31, 2019
Balance sheet classification
Cash and cash equivalents	$ 194,897	$ 290,837	$ 189,676
Restricted cash in current assets	301	659	351
Restricted cash in other long-term assets	37	105	86
Total restricted cash	338	764	437
Total cash, cash equivalents and restricted cash	195,235	$ 291,601	$ 190,113
Series A Convertible Preferred Stock
Issuance costs	$ 1,154