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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2014
Feb. 28, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (shares) 2,331,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 834,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 1,064,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross    
Aggregate intrinsic value of options exercised in period $ 17.3us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue $ 4.8us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue $ 0.2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue    
Total fair market value of stock options vested during the period 2.2us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 1.2us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 0.8us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1    
Unrecognized stock-based compensation expense, related to stock options 14.0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions        
2014 Stock Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Initial reserve of shares under the plan       1,850,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= qtwo_A2014StockPlanMember
 
Additional shares authorized under the plan, percentage increase       4.50%qtwo_SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofAdditionalSharesAuthorizedAutomaticAnnualPercentageIncrease
/ us-gaap_PlanNameAxis
= qtwo_A2014StockPlanMember
 
Shares reserved for future issuance       1,957,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= qtwo_A2014StockPlanMember
 
Granted (shares) 606,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= qtwo_A2014StockPlanMember
       
Shares available for future issuance under the plan 1,407,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= qtwo_A2014StockPlanMember
    2,006,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= qtwo_A2014StockPlanMember
 
Shares transferred from the previous plan that expired or terminated 7,000qtwo_SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofExpiredSharesTransferredfromPreviousPlan
/ us-gaap_PlanNameAxis
= qtwo_A2014StockPlanMember
    49,000qtwo_SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofExpiredSharesTransferredfromPreviousPlan
/ us-gaap_PlanNameAxis
= qtwo_A2014StockPlanMember
 
2007 Stock Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares reserved for future issuance 9,172,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= qtwo_A2007StockPlanMember
       
Additional shares authorized under the plan         1,400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_PlanNameAxis
= qtwo_A2007StockPlanMember
Shares transferred to new plan       107,000qtwo_SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofSharesTransferredtoNewPlan
/ us-gaap_PlanNameAxis
= qtwo_A2007StockPlanMember
 
Stock options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized stock-based compensation, related to stock options, period for recognition 3 years        
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized stock-based compensation, related to stock options, period for recognition 3 years 10 months 24 days        
Unrecognized stock-based compensation expense, related to restricted stock $ 0.5us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember