Number of shares authorized for issuance under share-based payment arrangement.

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 (a)(3)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Subsequent Events - Additional Information (Detail) - 2013 Equity Plan - Class A - Employees, Officers, and Directors - shares	Apr. 30, 2021	Mar. 31, 2021
Subsequent Event [Line Items]
Share-based compensation, stock authorized		2,300,000
Subsequent Event
Subsequent Event [Line Items]
Share-based compensation, stock authorized	2,750,000