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10. STOCK-BASED COMPENSATION - Weighted average assumptions (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Other information |  |  |  |
Income tax benefit recognized from allocation of share-based compensation expense |  |  | $ 0 |
Windfall tax benefits realized |  |  | 0 |
Unrecognized compensation costs | $ 5,200,000 |  | $ 5,200,000 |
Weighted average period of recognition of unrecognized compensation costs |  |  | 2 years 1 month 2 days |
Weighted average fair value per underlying share of options granted (in dollars per share) | $ 2.51 | $ 2.66 | $ 2.39 | $ 2.84
Employee stock options |  |  |  |
Stock-based compensation |  |  |  |
Risk-free interest rate (as a percent) | 0.38% | 1.66% |  |
Risk-free interest rate, low end of range (as a percent) |  |  | 0.22% | 1.66%
Risk-free interest rate, high end of range (as a percent) |  |  | 0.38% | 2.30%
Expected life | 5 years | 5 years | 5 years | 5 years
Volatility (as a percent) | 47.10% | 36.50% |  |
Volatility, low end of range (as a percent) |  |  | 41.90% | 36.50%
Volatility, high end of range (as a percent) |  |  | 47.10% | 37.30%
Employee stock purchase plan options |  |  |  |
Stock-based compensation |  |  |  |
Risk-free interest rate (as a percent) | 0.12% | 1.58% |  |
Risk-free interest rate, low end of range (as a percent) |  |  | 0.12% | 1.58%
Risk-free interest rate, high end of range (as a percent) |  |  | 0.15% | 2.43%
Expected life | 6 months | 6 months | 6 months | 6 months
Volatility (as a percent) | 68.60% | 33.50% |  |
Volatility, low end of range (as a percent) |  |  | 67.10% | 33.50%
Volatility, high end of range (as a percent) |  |  | 68.60% | 43.10%

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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 The estimated measure of the 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 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)(ii) -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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