Share Based Compensation - Summary of Option Activity (Detail) - USD ($)	12 Months Ended
Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Number of share options
Number of share options, Beginning balance	11,442,858	11,950,858	13,442,848
Number of share options, Expired	(6,875,185)	(440,000)
Number of share options, Forfeited or cancelled (post-vesting)	(91,300)	(68,000)	(1,491,990)
Number of share options, Ending balance	4,476,373	11,442,858	11,950,858	13,442,848
Number of share options, Vested and expected to vest	4,476,373
Number of share options, Exercisable	4,476,373
Weighted Average Exercise Price
Weighted Average Exercise Price, Beginning balance	$ 0.11	$ 0.11	$ 0.12
Weighted Average Exercise Price, Expired	0.03	0.02
Weighted Average Exercise Price, Forfeited or cancelled (post-vesting)	0.29	0.23	0.19
Weighted Average Exercise Price, Ending balance	0.23	$ 0.11	$ 0.11	$ 0.12
Weighted Average Exercise Price, Vested and expected to vest	$ 0.23
Weighted Average Remaining Contractual Life
Weighted Average Remaining Contractual Life	2 months 19 days	9 months 29 days	1 year 8 months 26 days	3 years 3 months 7 days
Weighted Average Remaining Contractual Life, Vested and expected to vest	2 months 19 days
Weighted Average Remaining Contractual Life, Exercisable	2 months 19 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value		$ 0	$ 0	$ 371,000
Aggregate Intrinsic Value, Vested and expected to vest	$ 0
Aggregate Intrinsic Value, Exercisable	$ 0

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Weighted average remaining contractual life.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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For presentations that combine terminations, 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 or that expired.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
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-Paragraph 2
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Weighted average price of options that were either forfeited or expired.

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- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Number of options outstanding, including both vested and non-vested options.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. 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.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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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.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. 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.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. 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.

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