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10. STOCK-BASED COMPENSATION - Stock-based compensation expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Stock-based compensation expense by line item
Stock-based compensation expense	$ 740	$ 693	$ 2,279	$ 2,101
Cost of revenues
Stock-based compensation expense by line item
Stock-based compensation expense	58	88	192	260
Research and development
Stock-based compensation expense by line item
Stock-based compensation expense	416	343	1,304	1,109
Selling, general and administrative
Stock-based compensation expense by line item
Stock-based compensation expense	$ 266	$ 262	$ 783	$ 732

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

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+ References

No definition available.

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