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Business Combination Schedule of Intangible Assets Acquired (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 0 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 16, 2013 | Jan. 08, 2014
Trade Names [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 8 years | 2 years |  |
Customer Relationships [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 7 years | 8 years |  |
Maintenance relationship [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 8 years |  |  |
Developed Technology Rights [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 7 years | 7 years |  |
SignalDemand [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | $ 8,300us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = pro_SignalDemandMember |
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets | 8,300us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = pro_SignalDemandMember |  | 8,300us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = pro_SignalDemandMember |
SignalDemand [Member] | Trade Names [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired | 40us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = pro_SignalDemandMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |  |  |
Finite-Lived Intangible Asset, Useful Life | 2 years |  |  |
SignalDemand [Member] | Customer Relationships [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired | 3,500us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = pro_SignalDemandMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  |
Finite-Lived Intangible Asset, Useful Life | 8 years |  |  |
SignalDemand [Member] | Developed Technology Rights [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired | 4,600us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = pro_SignalDemandMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |  |  |
Finite-Lived Intangible Asset, Useful Life | 7 years |  |  |
SignalDemand [Member] | Software and Software Development Costs [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired | 160us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = pro_SignalDemandMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_SoftwareAndSoftwareDevelopmentCostsMember |  |  |
Finite-Lived Intangible Asset, Useful Life | 2 years |  |  |
Cameleon Acquistion [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired | 18,653us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = pro_CameleonAcquistionMember |  |  |
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets |  |  |  | 18,653us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = pro_CameleonAcquistionMember
Cameleon Acquistion [Member] | Trade Names [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired | 1,020us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = pro_CameleonAcquistionMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |  |  |
Finite-Lived Intangible Asset, Useful Life | 8 years |  |  |
Cameleon Acquistion [Member] | Customer Relationships [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired | 1,455us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = pro_CameleonAcquistionMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  |
Cameleon Acquistion [Member] | Maintenance relationship [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired | 3,808us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = pro_CameleonAcquistionMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = pro_MaintenancerelationshipMember |  |  |
Finite-Lived Intangible Asset, Useful Life | 8 years |  |  |
Cameleon Acquistion [Member] | Developed Technology Rights [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired | 11,147us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = pro_CameleonAcquistionMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |  |  |
Finite-Lived Intangible Asset, Useful Life | 7 years |  |  |
Cameleon Acquistion [Member] | Other Intangible Assets [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired | 1,223us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = pro_CameleonAcquistionMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |  |  |
Finite-Lived Intangible Asset, Useful Life | 2 years |  |  |

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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination. + References No definition available. + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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