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Stock-based compensation - Classification of expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Stock-Based Compensation
Stock-based compensation expense	$ 11,790	$ 7,741
Stock options
Stock-Based Compensation
Stock-based compensation expense	11,778	7,741
Restricted stock units
Stock-Based Compensation
Stock-based compensation expense	12
Research and development expenses
Stock-Based Compensation
Stock-based compensation expense	5,749	3,689
General and administrative expenses
Stock-Based Compensation
Stock-based compensation expense	$ 6,041	$ 4,052

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- Definition

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+ References

No definition available.

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- Definition

Amount of noncash expense for share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

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