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Cash, Cash Equivalents and Investments - Securities in Continuous Loss Position (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]  
Fair Value $ 13,708us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Gross Unrealized Loss (14)qtwo_AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessthan12MonthsAccumulatedLoss
US government agency bonds [Member]  
Schedule of Available-for-sale Securities [Line Items]  
Fair Value 7,508us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Gross Unrealized Loss (6)qtwo_AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessthan12MonthsAccumulatedLoss
/ us-gaap_InvestmentTypeAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Corporate bonds and commercial paper [Member]  
Schedule of Available-for-sale Securities [Line Items]  
Fair Value 6,200us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_InvestmentTypeAxis
= qtwo_CorporateBondsandCommercialPaperMember
Gross Unrealized Loss $ (8)qtwo_AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessthan12MonthsAccumulatedLoss
/ us-gaap_InvestmentTypeAxis
= qtwo_CorporateBondsandCommercialPaperMember