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Income Tax Disclosure Tax Effect of Temporary Differences (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
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