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10. STOCK-BASED COMPENSATION - Stock-based compensation expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Stock-based compensation expense by line item
Stock-based compensation expense	$ 676	$ 661	$ 1,496	$ 1,299
Cost of Revenues
Stock-based compensation expense by line item
Stock-based compensation expense	57	49	124	109
Research and Development Expense
Stock-based compensation expense by line item
Stock-based compensation expense	369	390	755	741
Selling, General and Administrative Expenses
Stock-based compensation expense by line item
Stock-based compensation expense	$ 250	$ 222	$ 617	$ 449

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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