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10. STOCK-BASED COMPENSATION - Stock-based compensation expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Stock-based compensation expense by line item |  |  |  |
Stock-based compensation expense | $ 856 | $ 663 | $ 1,197 | $ 1,321
Cost of revenues |  |  |  |
Stock-based compensation expense by line item |  |  |  |
Stock-based compensation expense | 58 | 51 | 102 | 107
Research and development |  |  |  |
Stock-based compensation expense by line item |  |  |  |
Stock-based compensation expense | 303 | 336 | 241 | 626
Selling, general and administrative |  |  |  |
Stock-based compensation expense by line item |  |  |  |
Stock-based compensation expense | $ 495 | $ 276 | $ 854 | $ 588

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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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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