Related-Party Transactions - Summary of Terms of Letter Agreements (Detail) - MacAndrews & Forbes Incorporated [Member] - 2019 Letter Agreement [Member] - Class A Common Stock [Member] $ / shares in Units, $ in Millions	Dec. 23, 2019 USD ($) $ / shares shares
Class Of Warrant Or Right [Line Items]
Aggregate dollar value to be sold under agreement | $	$ 10.0
Specified purchase price per share | $ / shares	$ 1.60
Expiration date of letter agreement	Dec. 23, 2020
Shares available to be issued under related warrants | shares	365,472
Exercise price of related warrants | $ / shares	$ 1.84
Expiration date of related warrants	Dec. 23, 2026
Total shares issued as of March 31, 2021 | shares	6,250,000