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v2.4.1.9

Income Tax Disclosure (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Operating Loss Carryforwards [Line Items] |  |  |  |
Effective Income Tax Rate, Continuing Operations | (50.00%)us-gaap_EffectiveIncomeTaxRateContinuingOperations | (5.00%)us-gaap_EffectiveIncomeTaxRateContinuingOperations |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate |  |  | 38.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate |
Income Taxes Receivable | $ 1,400,000us-gaap_IncomeTaxReceivable | $ 600,000us-gaap_IncomeTaxReceivable |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | 837,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign | 0us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign |  |
Operating Loss Carryforwards | 68,400,000us-gaap_OperatingLossCarryforwards |  |  |
R&E tax credit carryforward for future use | 5,600,000pro_REtaxcreditcarryforwardforfutureuse |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Domestic | 16,400,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic |  |  |
Unrealized excess tax benefit related to stock compensation | 7,200,000pro_Unrealizedexcesstaxbenefitrelatedtostockcompensation |  |  |
Deferred tax asset, valuation allowance, domestic | 16,200,000pro_Deferredtaxassetvaluationallowancedomestic |  |  |
Undistributed Earnings of Foreign Subsidiaries | 300,000us-gaap_UndistributedEarningsOfForeignSubsidiaries |  |  |
Unrecognized Tax Benefits | 395,000us-gaap_UnrecognizedTaxBenefits | 349,000us-gaap_UnrecognizedTaxBenefits | 349,000us-gaap_UnrecognizedTaxBenefits | 349,000us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 56,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 3,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 3,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit | 0us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit |  |  |
Foreign tax paid | 100,000pro_Foreigntaxpaid |  |  |
Cameleon Acquistion [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating Loss Carryforwards | $ 33,800,000us-gaap_OperatingLossCarryforwards / us-gaap_BusinessAcquisitionAxis = pro_CameleonAcquistionMember |  |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 8 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Subparagraph c -Article 7 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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