Organization, Business and Summary of Significant Accounting Policies - Estimated Useful Lives of Assets (Detail)	Sep. 30, 2023
Property Plant And Equipment [Line Items]
Property, Plant, and Equipment, Useful Life, Term, Description [Extensible Enumeration]	us-gaap:UsefulLifeShorterOfTermOfLeaseOrAssetUtilityMember
Computer software and hardware | Minimum [Member]
Property Plant And Equipment [Line Items]
Estimated useful lives of assets	3 years
Computer software and hardware | Maximum [Member]
Property Plant And Equipment [Line Items]
Estimated useful lives of assets	5 years
Furniture, fixtures and other equipment | Minimum [Member]
Property Plant And Equipment [Line Items]
Estimated useful lives of assets	3 years
Furniture, fixtures and other equipment | Maximum [Member]
Property Plant And Equipment [Line Items]
Estimated useful lives of assets	5 years