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Business Combination (Details) | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended |  | 0 Months Ended | 3 Months Ended | 12 Months Ended |  |
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Jan. 08, 2014 EUR (€) | Dec. 31, 2014 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Jan. 08, 2014 Cameleon Acquistion [Member] USD ($) | Dec. 31, 2014 Cameleon Acquistion [Member] USD ($) | Dec. 31, 2014 Cameleon Acquistion [Member] USD ($) | Dec. 16, 2013 Cameleon Acquistion [Member] USD ($) | Dec. 16, 2013 SignalDemand [Member] USD ($) | Dec. 31, 2013 SignalDemand [Member] USD ($) | Mar. 31, 2014 SignalDemand [Member] USD ($) | Dec. 31, 2014 SignalDemand [Member] USD ($) | Dec. 31, 2013 SignalDemand [Member] USD ($) | Dec. 16, 2013 SignalDemand [Member] USD ($) | Jan. 08, 2014 Premium on shares [Member] USD ($) | Jan. 08, 2014 Free shares [Member] USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  | 81.70%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = pro_CameleonAcquistionMember | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = pro_CameleonAcquistionMember | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = pro_CameleonAcquistionMember |  |  |  |  |  |  |  |  |
Percentage owned of outstanding warrants |  |  |  |  |  | 94.00%pro_Percentageownedofoutstandingwarrants / us-gaap_BusinessAcquisitionAxis = pro_CameleonAcquistionMember |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  | $ 18,653,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = pro_CameleonAcquistionMember |  |  |  |  |  |  | $ 8,300,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = pro_SignalDemandMember |  | $ 8,300,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = pro_SignalDemandMember |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue |  |  |  |  |  | 5,392,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue / us-gaap_BusinessAcquisitionAxis = pro_CameleonAcquistionMember | 0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue / us-gaap_BusinessAcquisitionAxis = pro_CameleonAcquistionMember | 0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue / us-gaap_BusinessAcquisitionAxis = pro_CameleonAcquistionMember |  |  |  |  |  |  | 6,688,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue / us-gaap_BusinessAcquisitionAxis = pro_SignalDemandMember |  |
Business Combination, Contingent Consideration, Liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,700,000us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_ContingentConsiderationByTypeAxis = pro_PremiumonsharesMember | 1,400,000us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_ContingentConsiderationByTypeAxis = pro_FreesharesMember
Business Combination, Acquisition Related Costs |  |  | 3,019,000us-gaap_BusinessCombinationAcquisitionRelatedCosts | 2,173,000us-gaap_BusinessCombinationAcquisitionRelatedCosts | 0us-gaap_BusinessCombinationAcquisitionRelatedCosts |  |  | 1,700,000us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = pro_CameleonAcquistionMember |  |  |  |  | 1,300,000us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = pro_SignalDemandMember | 400,000us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = pro_SignalDemandMember |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  | 12,000,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual |  |  |  |  |  |  |  |  | 200,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = pro_SignalDemandMember | 8,700,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = pro_SignalDemandMember |  |  |  |  |
Premium to be paid per share | € 0.15pro_Premiumtobepaidpershare |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage ownership that triggers premium payment |  |  |  |  |  |  | 95.00%pro_Percentageownershipthattriggerspremiumpayment / us-gaap_BusinessAcquisitionAxis = pro_CameleonAcquistionMember |  |  |  |  |  |  |  |  |  |
Business combination, payment of contingent consideration |  |  | 2,225,000pro_Businesscombinationpaymentofcontingentconsideration | 0pro_Businesscombinationpaymentofcontingentconsideration | 0pro_Businesscombinationpaymentofcontingentconsideration |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Acquired During Period |  |  | 15,717,000us-gaap_GoodwillAcquiredDuringPeriod | 7,024,000us-gaap_GoodwillAcquiredDuringPeriod |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill- original estimate |  |  |  |  |  | 16,200,000pro_Goodwilloriginalestimate / us-gaap_BusinessAcquisitionAxis = pro_CameleonAcquistionMember |  |  |  |  |  |  |  |  | 7,000,000pro_Goodwilloriginalestimate / us-gaap_BusinessAcquisitionAxis = pro_SignalDemandMember |  |
Goodwill, Purchase Accounting Adjustments |  |  | 151,000us-gaap_GoodwillPurchaseAccountingAdjustments |  |  |  |  | 500,000us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_BusinessAcquisitionAxis = pro_CameleonAcquistionMember |  |  |  |  | 200,000us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_BusinessAcquisitionAxis = pro_SignalDemandMember |  |  |  |
Goodwill |  | 21,563,000us-gaap_Goodwill | 21,563,000us-gaap_Goodwill | 7,024,000us-gaap_Goodwill | 0us-gaap_Goodwill | 15,717,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = pro_CameleonAcquistionMember |  |  | 7,175,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = pro_CameleonAcquistionMember |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  | 32,000,000us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = pro_CameleonAcquistionMember |  | 13,500,000us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = pro_SignalDemandMember |  |  |  |  |  |  |
Deferred Tax Assets, Gross |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,199,000us-gaap_DeferredTaxAssetsGross / us-gaap_BusinessAcquisitionAxis = pro_SignalDemandMember |  |

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- Definition Percentage owned of outstanding warrants + References No definition available. + Details
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- Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e1043-128460 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Amount of deferred revenue expected to be recognized as such within one year or the normal operating cycle, if longer, assumed 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 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 before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e961-128460 + Details
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