Share based compensation arrangement by share based payment award initial offering period.

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- Definition

Share based compensation arrangement by share based payment award maximum amount per employee.

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- Definition

Share based compensation arrangement by share based payment award purchase period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Aggregate number of common shares reserved for future issuance.

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- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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- Definition

Description of service or performance condition required to be met for earning right to award under share-based payment arrangement. Includes, but is not limited to, combination of market, performance or service condition.

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- Definition

Description of terms of share-based payment arrangement. Includes, but is not limited to, type of award or grantee and reason for issuance.

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- Definition

Discount rate from fair value on purchase date that participants pay for shares.

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- Definition

The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

+ References

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- Definition

The highest quantity of shares an employee can purchase under the plan per period.

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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.

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- Definition

Net number of share options (or share units) granted during the period.

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- Definition

Percentage of vesting of award under share-based payment arrangement.

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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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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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

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Number of share options (or share units) exercised during the current period.

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Stockholders' Equity - Stock Options and Employee Stock Purchase Plan - Additional Information (Detail) - USD ($)				12 Months Ended
	Mar. 08, 2021	Aug. 14, 2018	Apr. 24, 2017	Mar. 31, 2021	Mar. 31, 2020
Class Of Stock [Line Items]
Issuances of common stock from stock option exercises, Shares				7,800
Weighted-average remaining contractual term of stock options exercisable				1 year 2 months 4 days
Weighted-average remaining contractual term of stock options outstanding				1 year 2 months 4 days
Number of common stock shares approved under ESPP				1,911,135
Expected life of options				5 years 9 months 21 days	6 years
2012 Plan [Member]
Class Of Stock [Line Items]
Issuances of common stock from stock option exercises, Shares				751,875
2012 Plan [Member] \| Executive Chairman [Member]
Class Of Stock [Line Items]
Stock options granted	120,000
2012 Plan [Member] \| Chief Scientific Officer [Member]
Class Of Stock [Line Items]
Stock options granted	25,000
Inducement Award Agreement [Member]
Class Of Stock [Line Items]
Vesting period			4 years
Award vesting conditions				These stock options were to vest over a four-year period, with a quarter of the option shares vesting on the one-year anniversary of the vesting commencement date and the remaining options shares vesting in equal quarterly installments over the next 12 quarterly periods.
Award vesting percentage				25.00%
Inducement Award Agreement [Member] \| CEO [Member]
Class Of Stock [Line Items]
Stock options granted			104,410
Inducement Award Agreement [Member] \| CMO [Member]
Class Of Stock [Line Items]
Stock options granted		48,734
ESPP [Member]
Class Of Stock [Line Items]
Number of common stock shares approved under ESPP				75,000
Employee subscription rate				15.00%
Compensation amount per employee				$ 25,000
Number of shares per employee				500
Fair market value at discount				85.00%
Purchase period				6 months
Initial offering period				2016-09
Description of plan				Shares under the ESPP are purchased at 85 percent of the fair market value at the lower of (i) the closing price on the first trading day of the six-month purchase period or (ii) the closing price on the last trading day of the six-month purchase period.
Expected life of options				6 months
Shares issued under ESPP				0
Shares remaining available for purchase under ESPP				59,435