Number of participants enrolled in employee stock purchase plan.

No definition available.

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- Definition

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.

+ References

No definition available.

+ Details

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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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ Details

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- Definition

Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of cost to be recognized for option under share-based payment arrangement.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ Details

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- Details

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- Details

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- Details

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Stockholders' Equity - Stock-based Compensation Expense and Valuation Information - Additional Information (Detail) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2022 USD ($) Participant	Sep. 30, 2021	Sep. 30, 2022 USD ($) Participant	Sep. 30, 2021
Class Of Stock [Line Items]
Total unrecognized compensation cost related to unvested stock option grants	$ 3.4		$ 3.4
Expected term	6 years	6 years	6 years	6 years
2016 Employee Stock Purchase Plan [Member]
Class Of Stock [Line Items]
Expected term			6 months
Participants enrolled into the employee stock purchase plan \| Participant	1		1
Stock options [Member]
Class Of Stock [Line Items]
Total unrecognized compensation cost related, weighted average period			2 years 3 months 18 days
Restricted stock units (RSUs) [Member]
Class Of Stock [Line Items]
Total unrecognized compensation cost related, weighted average period			2 years 4 months 17 days
Unrecognized stock-based compensation expense	$ 0.1		$ 0.1