The Reverse Recapitalization and Related Transactions - Summary of Common Stock Issued (Parenthetical) (Detail) - Adjustment To APIC Related To The Reverse Recapitalization [Member] $ in Millions	6 Months Ended
Jun. 30, 2022 USD ($)
Number Of Shares Of Common Stock Issued Immediately Following The Consummation Of The Business Combination [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	$ 178.5
Dave Class A Common Stock [Member]
Number Of Shares Of Common Stock Issued Immediately Following The Consummation Of The Business Combination [Line Items]
Conversion Of Convertible Preferred Stock Into Common Stock In Connection With Reverse Recapitalization	$ 72.2

Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
-URI https://asc.fasb.org/extlink&oid=123455525&loc=d3e2207-128464

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=128092470&loc=d3e4845-128472

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant