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11. STOCK-BASED COMPENSATION - Weighted average assumptions (Details) - USD ($) | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Stock-based compensation |  |  |
Expected life | 5 years |  |
Dividend yield (as a percent) | 0.00% |  |
Other information |  |  |
Income tax benefit recognized from allocation of share-based compensation expense | $ 0 | $ 0 |
Windfall tax benefits realized | 0 | $ 0 |
Unrecognized compensation costs | $ 5,300,000 |  |
Weighted average period of recognition of unrecognized compensation costs | 2 years 4 days |  |
Weighted average fair value per underlying share of options granted (in dollars per share) | $ 2.55 | $ 2.86 | $ 2.44
Employee stock options |  |  |
Stock-based compensation |  |  |
Risk-free interest rate, low end of range (as a percent) | 0.22% | 1.35% | 2.53%
Risk-free interest rate, high end of range (as a percent) | 0.42% | 2.30% | 2.91%
Expected life | 5 years | 5 years | 5 years
Volatility, low end of range (as a percent) | 41.90% | 36.50% | 35.60%
Volatility, high end of range (as a percent) | 47.60% | 39.70% | 37.30%
Employee stock purchase plan options |  |  |
Stock-based compensation |  |  |
Risk-free interest rate, low end of range (as a percent) | 0.12% | 1.58% | 2.09%
Risk-free interest rate, high end of range (as a percent) | 0.15% | 2.43% | 2.50%
Expected life | 6 months | 6 months | 6 months
Volatility, low end of range (as a percent) | 67.10% | 33.50% | 32.60%
Volatility, high end of range (as a percent) | 68.60% | 43.10% | 37.70%

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + 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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