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11. STOCK-BASED COMPENSATION - Stock option activities (Details) - $ / shares | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
STOCK-BASED COMPENSATION |  |  |
Shares available for grant, Beginning | 2,584,186 |  |
Granted (in shares) | (831,635) |  |
Forfeited (in shares) | 1,343,425 |  |
Shares available for grant, Ending | 3,095,976 | 2,584,186 |
Number of Shares Underlying Options Outstanding |  |  |
Balance at the beginning of the period (in shares) | 8,968,199 |  |
Granted (in shares) | 831,635 |  |
Exercised (in shares) | (73,730) |  |
Forfeited (in shares) | (2,089,388) |  |
Balance at the end of the period (in shares) | 7,636,716 | 8,968,199 |
Options vested and exercisable (in shares) | 5,480,321 |  |
Options vested and expected to vest (in shares) | 7,585,284 |  |
Options unvested (in shares) | 2,179,020 |  |
Weighted Average Remaining Contractual Life |  |  |
Options weighted average remaining contractual life | 5 years 4 months 17 days |  |
Options vested and exercisable | 4 years 3 months 10 days |  |
Options vested and expected to vest | 5 years 4 months 9 days |  |
Options unvested | 8 years 1 month 28 days |  |
Weighted Average Exercise Price |  |  |
Balance at the beginning of the period (in dollars per share) | $ 5.26 |  |
Granted (in dollars per share) | 3.08 |  |
Exercised (in dollars per share) | 2.08 |  |
Forfeited (in dollars per share) | 5.36 |  |
Balance at the end of the period (in dollars per share) | 5.03 | $ 5.26 |
Options vested and exercisable (in dollars per share) | 5.47 |  |
Options vested and expected to vest (in dollars per share) | 5.03 |  |
Options unvested (in dollars per share) | 3.9 |  |
Weighted Average Grant Date Fair Value Per Share |  |  |
Balance at the beginning of the period (in dollars per share) | 2.11 |  |
Granted (in dollars per share) | 2.23 | 2.13 | $ 1.38
Exercised (in dollars per share) | 0.99 |  |
Forfeited (in dollars per share) | 2.19 |  |
Balance at the end of the period (in dollars per share) | 2.11 | $ 2.11 |
Options vested and exercisable (in dollars per share) | 2.07 |  |
Options vested and expected to vest (in dollars per share) | 2.11 |  |
Options unvested (in dollars per share) | $ 2.21 |  |

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- Definition The effect on the total number of shares available for grant that is related to options forfeited during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value per share of options exercised during the reporting period as calculated by applying the disclosed option pricing methodology. + References No definition available. + Details
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- Definition Weighted average remaining contractual term for non-vested option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options outstanding as of the reporting period as calculated by applying the disclosed option pricing methodology. + References No definition available. + Details
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- Definition The weighted average grant-date fair value per share of options outstanding and expected to vest as of the reporting date as calculated by applying the disclosed option pricing methodology. + References No definition available. + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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