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Property and Equipment, Net (Details) (USD $)
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12 Months Ended |
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Property, Plant and Equipment [Line Items] |
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| Property and equipment |
$ 71,889,000us-gaap_PropertyPlantAndEquipmentGross |
$ 57,927,000us-gaap_PropertyPlantAndEquipmentGross |
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| Depreciation, Depletion And Amortization, Excluding Intangible Asset Amortization |
11,500,000qlys_DepreciationDepletionAndAmortizationExcludingIntangibleAssetAmortization |
9,200,000qlys_DepreciationDepletionAndAmortizationExcludingIntangibleAssetAmortization |
6,900,000qlys_DepreciationDepletionAndAmortizationExcludingIntangibleAssetAmortization |
| Less: accumulated depreciation and amortization |
(45,271,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment |
(34,852,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment |
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| Property and equipment, net |
26,618,000us-gaap_PropertyPlantAndEquipmentNet |
23,075,000us-gaap_PropertyPlantAndEquipmentNet |
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| Capital lease |
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3,100,000us-gaap_CapitalLeasedAssetsGross |
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| Capital lease, accumulated depreciation |
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1,200,000us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation |
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| Computer equipment |
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| Property, Plant and Equipment [Line Items] |
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| Property and equipment |
35,576,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember |
27,464,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember |
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| Computer software |
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| Property, Plant and Equipment [Line Items] |
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| Property and equipment |
10,899,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerSoftwareIntangibleAssetMember |
9,277,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerSoftwareIntangibleAssetMember |
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| Furniture, fixtures and equipment |
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| Property, Plant and Equipment [Line Items] |
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| Property and equipment |
2,931,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember |
2,031,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember |
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| Scanner appliances |
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| Property, Plant and Equipment [Line Items] |
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| Property and equipment |
19,861,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = qlys_ScannerAppliancesMember |
17,055,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = qlys_ScannerAppliancesMember |
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| Scanner appliances and other computer equipment subject to subscription |
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| Property, Plant and Equipment [Line Items] |
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| Property and equipment, net |
6,000,000us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = qlys_ScannerAppliancesAndOtherComputerEquipmentSubjectToSubscriptionMember |
4,700,000us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = qlys_ScannerAppliancesAndOtherComputerEquipmentSubjectToSubscriptionMember |
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| Scanner appliances and other computer equipment not placed in service |
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| Property, Plant and Equipment [Line Items] |
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| Property and equipment |
1,400,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = qlys_ScannerAppliancesAndOtherComputerEquipmentNotPlacedInServiceMember |
600,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = qlys_ScannerAppliancesAndOtherComputerEquipmentNotPlacedInServiceMember |
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| Leasehold improvements |
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| Property, Plant and Equipment [Line Items] |
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| Property and equipment |
2,622,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember |
2,100,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember |
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| Other fixed assets not placed in service |
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| Property, Plant and Equipment [Line Items] |
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| Property and equipment |
$ 2,800,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = qlys_OtherFixedAssetsNotPlacedInServiceMember |
$ 1,600,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = qlys_OtherFixedAssetsNotPlacedInServiceMember |
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