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10. STOCK-BASED COMPENSATION - Stock-based compensation expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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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

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