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11. STOCK-BASED COMPENSATION - Weighted average assumptions (Details) - USD ($) | 12 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Other information |  |  |
Income tax benefit recognized from allocation of share-based compensation expense | $ 0 | $ 0 |
Windfall tax benefits realized | 0 | $ 0 |
Unrecognized compensation costs | $ 5,100,000 |  |
Weighted average period of recognition of unrecognized compensation costs | 2 years 11 months 12 days |  |
Weighted average fair value per underlying share of options granted (in dollars per share) | $ 2.23 | $ 2.13 | $ 1.38
Minimum |  |  |
Stock-based compensation |  |  |
Expected life | 4 years 10 months 24 days | 4 years 6 months | 4 years 7 months 6 days
Maximum |  |  |
Stock-based compensation |  |  |
Expected life | 5 years | 4 years 10 months 24 days | 5 years
Employee Stock Option [Member] |  |  |
Stock-based compensation |  |  |
Risk-free interest rate, low end of range (as a percent) | 4.05% | 3.69% | 2.95%
Risk-free interest rate, high end of range (as a percent) | 4.48% | 4.80% | 4.27%
Volatility, low end of range (as a percent) | 91.00% | 80.70% | 49.20%
Volatility, high end of range (as a percent) | 96.70% | 85.90% | 53.10%
Employee Stock Option [Member] | Minimum |  |  |
Stock-based compensation |  |  |
Expected life | 4 years 10 months 20 days | 4 years 5 months 15 days | 4 years 6 months 18 days
Employee Stock Option [Member] | Maximum |  |  |
Stock-based compensation |  |  |
Expected life | 5 years | 4 years 11 months 8 days | 5 years
Employee stock purchase plan options |  |  |
Stock-based compensation |  |  |
Risk-free interest rate, low end of range (as a percent) | 4.44% | 5.26% | 1.54%
Risk-free interest rate, high end of range (as a percent) | 5.41% | 5.38% | 4.54%
Expected life | 6 months | 6 months | 6 months
Volatility, low end of range (as a percent) | 6.10% | 28.80% | 49.30%
Volatility, high end of range (as a percent) | 12.40% | 83.90% | 58.20%

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Amount of cost to be recognized for option under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Amount of tax benefit for recognition of expense of award under share-based payment arrangement. + References Reference 1: 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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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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