v3.10.0.1

STOCK-BASED COMPENSATION (Tables) | 6 Months Ended
--- | ---
Jul. 01, 2018
Stock-Based Compensation [Abstract] |
Schedule of Share-Based Compensation [Table Text Block] |
|  | Three Months Ended |  | Six Months Ended |
(in thousands) |  | July 1, 2018 |  | July 2, 2017 |  | July 1, 2018 |  | July 2, 2017 |
Stock options |  | $ | 120 |  | $ | 16 |  | $ | 167 |  | $ | 116 |
Restricted stock |  |  | — |  |  | 8 |  |  | — |  |  | 15 |
|  | $ | 120 |  | $ | 24 |  | $ | 167 |  | $ | 131 |
Schedule of Stock Options Roll Forward [Table Text Block] |
|  |  |  |  |  |  | Weighted
|  |  |  |  |  |  | Average
|  |  |  |  |  |  | Remaining
|  | Number of |  | Weighted Average |  | Contractual
(number of options in thousands) |  | Options |  | Exercise Price |  | Life in Years
Options outstanding at December 31, 2017 |  | 539 |  | $ | 6.60 |  | 6.6
Granted |  | 90 |  |  | 7.67 |  |
Exercised |  | (125) |  |  | 5.26 |  |
Forfeited or expired |  | (83) |  |  | 5.65 |  |
Options outstanding at July 1, 2018 |  | 421 |  | $ | 7.30 |  | 7.3
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block] |
|  | Six Months Ended |
|  | July 1, 2018 |  | July 2, 2017 |
Weighted-average fair value of options granted during the period |  | $ | 3.73 |  | $ | 2.55 |
Expected life (in years) |  |  | 6.2 |  |  | 5.0 |
Expected dividend |  | $ | — |  | $ | — |
Expected stock volatility |  |  | 45.94 | % |  | 60.47 | %
Risk-free interest rate |  |  | 2.9 | % |  | 2.2 | %

X
- Definition Performance Shares, Stock Options, Other Forms Of Compensation And Common Share Repurchaces [Abstract] + References No definition available. + Details
Name: | dave_PerformanceSharesStockOptionsOtherFormsOfCompensationAndCommonShareRepurchacesAbstract
Namespace Prefix: | dave_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardEmployeeStockPurchasePlanValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the change in stock options. + References No definition available. + Details
Name: | us-gaap_ScheduleOfStockOptionsRollForwardTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration