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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

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- 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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