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The Reverse Recapitalization and Related Transactions - Additional Information (Detail) $ / shares in Units, $ in Millions	Jan. 05, 2022 USD ($) $ / shares shares	Jun. 30, 2022 $ / shares shares	Dec. 31, 2021 shares	Aug. 17, 2021 USD ($) shares	Jun. 07, 2021 $ / shares
Share Price | $ / shares		$ 0.005			$ 8.67
Threshold applicable common share price | $ / shares	$ 12.5
Number of options outstanding immediately after the business combination		30,387,380	34,709,027
Warrants To Purchase Class A Common Stock [Member]
Class of warrant or right, Number of securities called by warrants or rights	11,444,235
Public Warrants [Member]
Class of warrant or right, number of securities called by warrants or rights listed on stock exchange	6,344,131
Warrants outstanding		6,344,021
Private Placement Warrants [Member]
Warrants outstanding		5,100,214
Exercise price | $ / shares		$ 11.5
New Dave Options [Member]
Number of options outstanding immediately after the business combination		32,078,481
Promissory Note [Member] | Alameda Research [Member]
Principal amount | $				$ 15.0
Business Combination Agreement [Member]
Adjustment to additional paid in capital transaction and issuance costs incurred | $	$ 22.6
Business combination transaction costs capitalized | $	5.1
Accrued transaction costs | $	$ 7.5
Amendment To The Subscription Agreement [Member] | Promissory Note [Member] | Alameda Research [Member]
Purchase price | $				$ 15.0
Stock issued during the period shares conversion of debt	1,500,000
Founder Holder Earnout Shares [Member] | Triggering Event One [Member]
Percentage of shares immediately become vested and no longer subject to forfeiture upon occurrence of event	(60.00%)
Number of shares immediately become vested and no longer subject to forfeiture upon occurrence of event	(951,622)
Share Price | $ / shares	$ 12.5
Founder Holder Earnout Shares [Member] | Triggering Event Two [Member]
Number of shares immediately become vested and no longer subject to forfeiture upon occurrence of event	(634,415)
Share Price | $ / shares	$ 15
Threshold applicable common share price | $ / shares	$ 15
Conversion Of Shares Of Legacy Dave [Member]
Conversion of stock, shares issued	342,638,866
Common Class A [Member]
Shares subject to forfeiture	1,586,037
Period over which vesting conditions shall be met	5 years
Exercise price | $ / shares		$ 11.5
Common Class A [Member] | Original Subscription Agreement [Member]
Investor agreed to prefund its obligation under agreement to subscribe number of shares				1,500,000
Aggregate PIPE Financing subscription amount | $				$ 15.0
Common Class A [Member] | Conversion Of Shares Of Legacy Dave [Member]
Conversion of stock, shares issued	294,188,227
Common Class A [Member] | Conversion Of Shares Of Vpcc [Member]
Conversion of stock, shares issued	5,392,528
Common Class A [Member] | Conversion Of Shares Of Vpcc [Member] | Founder Shares [Member]
Conversion of stock, shares converted	5,392,528
Class V Common Stock [Member] | Conversion Of Shares Of Legacy Dave [Member]
Conversion of stock, shares issued	48,450,639
Series A, Series B1And Series B2 And Series A Redeemable Convertible Preferred Stock [Member]
Convertible preferred stock converted in to shares of common stock immediately prior to the business combination	204,657,950
Class A And Class V Common Stock [Member]
Conversion of stock, shares issued	342,638,866
Common stock shares issuable upon the exercise of options and warrants	32,078,481
Vpcc [Member]
Cash Acquired from Acquisition | $	$ 7.0
Vpcc [Member] | Subscription Agreement [Member] | Private Investment In Public Equity Investors [Member]
Investor agreed to prefund its obligation under agreement to subscribe number of shares	21,000,000
Shares Issued, Price Per Share | $ / shares	$ 10
Aggregate PIPE Financing subscription amount | $	$ 210.0
Vpcc [Member] | Common Class A [Member]
Transactions Costs | $	22.6
Legacy Dave [Member] | Common Class A [Member]
Shares outstanding and being excercised by the holders for redemption value | $	$ 224.2
Number of shares converted as a result of each share of non redeemed common stock	1

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