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Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2022 USD ($) $ / shares shares | Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) shares | Oct. 06, 2021 $ / shares | Jun. 07, 2021 $ / shares | Aug. 30, 2020 $ / shares | Aug. 05, 2019 $ / shares
FDIC Insured Amount | $ 23,500,000 |  | $ 31,900,000 |  |  |  |
Loan origination costs | 900,000 | $ 900,000 |  |  |  |  |
Subscription fees Received | 1 |  |  |  |  |  |
Restricted Cash | $ 100,000 | 200,000 |  |  |  |  |
Share price | $ / shares | $ 0.005 |  |  |  | $ 8.67 |  |
Fair Value, Option, Loans Held as Assets, Aggregate Difference | $ 0 |  | 35,300,000 |  |  |  |
Advertising expense | $ 12,200,000 | 14,000,000.0 |  |  |  |  |
Effective Income Tax Rate | 50.00% |  |  |  |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | $ 8,000.000 |  | 7,000.000 |  |  |  |
Changes in fair value of warrant liability | 4,065,000 | 2,186,000 |  |  |  |  |
Amortization of Intangible Assets | 1,000,000.0 | 600,000 |  |  |  |  |
Capitalized Computer Software, Period Increase (Decrease) | 2,300,000 | 1,100,000 |  |  |  |  |
Exercise of call options on loans to stockholders | 29,700,000 |  |  |  |  |  |
Contra equity loan to stockholders settled | 15,200,000 |  |  |  |  |  |
Debt securities loss | 100,000 |  |  |  |  |  |
State and Local Jurisdiction [Member] |  |  |  |  |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 500,000 |  | 500,000 |  |  |  |
Warrant Liability Related To Debt Facility [Member] |  |  |  |  |  |  |
Changes in fair value of warrant liability | $ (400,000) |  |  |  |  |  |
Class of warrants or rights excercised during the period units | shares | 1,664,394 |  |  |  |  |  |
Stock issued during the period exercise of warrants | shares | 450,841 |  |  |  |  |  |
Public Warrants [Member] |  |  |  |  |  |  |
Changes in fair value of warrant liability | $ (1,700,000) |  |  |  |  |  |
Private Placement Warrants [Member] |  |  |  |  |  |  |
Changes in fair value of warrant liability | (2,800,000) |  |  |  |  |  |
Common stock [Member] | Estimation of Valuation [Member] |  |  |  |  |  |  |
Share price | $ / shares |  |  |  | $ 10.80 |  | $ 0.981 | $ 0.935
Series A convertible preferred stock [Member] | Additional paid-in capital [Member] |  |  |  |  |  |  |
Conversion from permanent equity to temporary equity retroactive recapitalization |  |  | 9,881 |  |  |  |
Series B One Convertible Preferred Stock [Member] | Additional paid-in capital [Member] |  |  |  |  |  |  |
Conversion from permanent equity to temporary equity retroactive recapitalization |  |  | 49,675 |  |  |  |
Series B Two Convertible Preferred Stock [Member] | Additional paid-in capital [Member] |  |  |  |  |  |  |
Conversion from permanent equity to temporary equity retroactive recapitalization |  |  | $ 12,617 |  |  |  |
Dave Inc [Member] |  |  |  |  |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | 1,000.000 | $ 2,000.000 |  |  |  |  |
Dave Inc [Member] | Series B One And B Two Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |  |
Conversion of redeemable convertible preferred stock into common stock conversion ratio |  |  | 1.033076 |  |  |  |
Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |
Fair Value, Net Asset (Liability) | $ 0 |  | $ 0 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |  |  |  |  |
Share price | $ / shares | $ 3.273 |  |  |  |  |  |
Shares Issued, Price Per Share | $ / shares |  |  |  |  |  |  | $ 0.935
Maximum [Member] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life | 7 years |  |  |  |  |  |
Share price | $ / shares | $ 3.42 |  |  |  |  |  |
Shares Issued, Price Per Share | $ / shares |  |  |  |  |  | $ 0.981 |
Computer Software, Intangible Asset [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 3 years |  |  |  |  |  |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |  |  |  |
Accounts Receivable, Noncurrent, Threshold Period Past Due | 120 days |  |  |  |  |  |
Class A common stock [Member} |  |  |  |  |  |  |
Stock shares issued during the period discharge of promissory note shares | shares | 1,500,000 |  |  |  |  |  |
Series A Preferred Stock [Member] |  |  |  |  |  |  |
Shares Issued, Price Per Share | $ / shares | $ 0.000001 |  |  |  |  |  |
Series A Preferred Stock [Member] | Dave Inc [Member] |  |  |  |  |  |  |
Conversion of redeemable convertible preferred stock into common stock conversion ratio |  |  | 1 |  |  |  |
Series B1 Preferred Stock [Member] |  |  |  |  |  |  |
Shares Issued, Price Per Share | $ / shares | 0.000001 |  |  |  |  |  |
Series B2 Preferred Stock [Member] |  |  |  |  |  |  |
Shares Issued, Price Per Share | $ / shares | $ 0.000001 |  |  |  |  |  |
Class A And Class V Common Stock [Member] |  |  |  |  |  |  |
Common stock previously outstanding convered into new common stock exchange ratio | 1.354387513 |  | 1.354387513 |  |  |  |
Common stock shares issuable upon the exercise of options | shares |  |  | 32,078,481 |  |  |  |
Class A And Class V Common Stock [Member] | Dave Inc [Member] |  |  |  |  |  |  |
Conversion of redeemable convertible preferred stock into common stock shares | shares |  |  | 342,649,141 |  |  |  |

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