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Income Tax Disclosure Tax Effect of Temporary Differences (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Disclosure - Tax Effect of Temporary Differences [Abstract] |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, State and Foreign | $ 185pro_DeferredTaxAssetsTaxCreditCarryforwardsStateAndForeign | $ (7)pro_DeferredTaxAssetsTaxCreditCarryforwardsStateAndForeign |
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts | 178us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts | (191)us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts |
Deferred Tax Assets, Operating Loss Carryforwards, Domestic and State | 1,664pro_DeferredTaxAssetsOperatingLossCarryforwardsDomesticAndState | 2,601pro_DeferredTaxAssetsOperatingLossCarryforwardsDomesticAndState |
Deferred Tax Assets, Net, Current | 2,027us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent | 2,403us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent |
Deferred Tax Assets, Valuation Allowance, Current | (1,953)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent | (270)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent |
Deferred Tax Assets, Net of Valuation Allowance, Current | 74us-gaap_DeferredTaxAssetsNetCurrent | 2,133us-gaap_DeferredTaxAssetsNetCurrent |
Deferred Tax Assets Property And Equipment Net | (2,186)pro_DeferredTaxAssetsPropertyAndEquipmentNet | (1,786)pro_DeferredTaxAssetsPropertyAndEquipmentNet |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits | 9,095us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits | 7,808us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits |
Deferred Tax Assets, State Taxes | 217us-gaap_DeferredTaxAssetsStateTaxes | 292us-gaap_DeferredTaxAssetsStateTaxes |
Deferred Tax Liabilities, Deferred Expense, Capitalized Software | (897)us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware | (1,541)us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware |
Deferred Tax Liabilities, Intangible Assets | (2,193)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets | (2,366)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets |
Deferred Tax Assets, Tax Credit Carryforwards, Research | 4,316us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch | 2,708us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch |
Deferred Tax Asset, Deferred Revenue | 56pro_DeferredTaxAssetDeferredRevenue | 431pro_DeferredTaxAssetDeferredRevenue |
Increase (Decrease) in Prepaid Expense and Other Assets | 3,383us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | (1,204)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | (2,215)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Deferred Tax Assets, Operating Loss Carryforwards | 5,733us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 4,724us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local | 537us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal | 813us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal |
Tax Credit Carryforward, Deferred Tax Asset | 1,240us-gaap_TaxCreditCarryforwardDeferredTaxAsset | 509us-gaap_TaxCreditCarryforwardDeferredTaxAsset |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign | 10,111us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign | 0us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | 837us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign | 0us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign |
Deferred Tax Assets, Other | (21)us-gaap_DeferredTaxAssetsOther | 0us-gaap_DeferredTaxAssetsOther |
Deferred Tax Assets, Net, Noncurrent | 26,845us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent | 11,592us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent |
Deferred Tax Assets, Valuation Allowance, Noncurrent | (26,919)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent | (1,087)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent |
Deferred Tax Liabilities, Net, Noncurrent | (74)us-gaap_DeferredTaxLiabilitiesNoncurrent |  |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent | 0us-gaap_DeferredTaxAssetsNetNoncurrent | 10,505us-gaap_DeferredTaxAssetsNetNoncurrent |
Deferred Tax Assets, Net of Valuation Allowance | $ 0us-gaap_DeferredTaxAssetsNet | $ 12,638us-gaap_DeferredTaxAssetsNet |

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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences expected to be realized or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e31917-109318 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e31931-109318 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed after one year (or the normal operating cycle, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e31917-109318 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e31931-109318 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e31958-109318 + Details
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- Definition The increase (decrease) during the reporting period in the value of prepaid expenses and other assets not separately disclosed in the statement of cash flows, for example, deferred expenses, intangible assets, or income taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Amount of deferred tax asset, before valuation allowance, attributable to deductible other tax 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 -Topic 740 -SubTopic 10 -Section 30 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6907311&loc=d3e30536-109315 + Details
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