XML 16 R54.htm IDEA: XBRL DOCUMENT v2.4.1.9

Property and Equipment, net (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 31,873,000us-gaap_PropertyPlantAndEquipmentGross	$ 27,539,000us-gaap_PropertyPlantAndEquipmentGross
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(16,085,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	(11,952,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property, Plant and Equipment, Net	15,788,000us-gaap_PropertyPlantAndEquipmentNet	15,587,000us-gaap_PropertyPlantAndEquipmentNet
Depreciation	5,000,000us-gaap_Depreciation	4,189,000us-gaap_Depreciation	2,188,000us-gaap_Depreciation
Disposal of Property Plant and Equipment		1,500,000pro_DisposalOfPropertyPlantAndEquipment	800,000pro_DisposalOfPropertyPlantAndEquipment
Full Depreciated Assets in Use	6,700,000pro_FullDepreciatedAssetsInUse	3,800,000pro_FullDepreciatedAssetsInUse
Internal-use software development costs capitalized	2,305,000pro_InternalUseSoftwareDevelopmentCostsCapitalized	2,874,000pro_InternalUseSoftwareDevelopmentCostsCapitalized	2,013,000pro_InternalUseSoftwareDevelopmentCostsCapitalized
Internal Use Software Developed, Subject To Amortization	1,600,000pro_InternalUseSoftwareDevelopedSubjectToAmortization	1,700,000pro_InternalUseSoftwareDevelopedSubjectToAmortization
Capitalized Computer Software, Amortization	200,000us-gaap_CapitalizedComputerSoftwareAmortization	500,000us-gaap_CapitalizedComputerSoftwareAmortization
Tangible Asset Impairment Charges	4,040,000us-gaap_TangibleAssetImpairmentCharges	0us-gaap_TangibleAssetImpairmentCharges	0us-gaap_TangibleAssetImpairmentCharges
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	2,874,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember	2,423,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember
Furniture and Fixtures [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	7 years
Furniture and Fixtures [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	15,662,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember	10,857,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember
Computer Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Computer Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Software [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	5,068,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerSoftwareIntangibleAssetMember	4,322,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerSoftwareIntangibleAssetMember
Software [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	2 years
Software [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	6 years
Software Development [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Property, Plant and Equipment, Gross	2,639,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareDevelopmentMember	5,064,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareDevelopmentMember
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	Shorter of lease term or useful life
Property, Plant and Equipment, Gross	5,625,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember	4,568,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	5,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember	305,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember
Cloud-based product offerings [Member]
Property, Plant and Equipment [Line Items]
Internal-use software development costs capitalized	$ 2,500,000pro_InternalUseSoftwareDevelopmentCostsCapitalized / pro_InternalUseSoftwareAxis = pro_CloudBasedProductOfferingsMember	$ 3,100,000pro_InternalUseSoftwareDevelopmentCostsCapitalized / pro_InternalUseSoftwareAxis = pro_CloudBasedProductOfferingsMember

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Full Depreciated Assets in Use

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Amount of internal-use software development costs capitalized by the company in the period and included in property and equipment, net in the consolidated balance sheet.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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For each income statement presented, the amount charged to expense for amortization of capitalized computer software costs.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value.

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