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Stock-based Compensation Plans - Additional Information (Detail) - shares	1 Months Ended	9 Months Ended
	Oct. 31, 2020	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cancellation of common stock options		119
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cancellation of common stock options	1,500,000
Class B
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units holder entitle to receive number of shares of common stock upon certain service conditions		1

X

- Definition

Restricted stock units holder entitle to receive number of shares of common stock upon certain service conditions.

+ References

No definition available.

+ Details

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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.

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X

- 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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