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Income Tax Disclosure Reconciliation of Federal Tax Rate (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure - Reconciliation of Federal Tax Rate [Abstract]      
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate $ (8,520)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 1,113us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 2,726us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Income Tax Reconciliation, State and Local Income Taxes 49us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (583)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (84)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Income Tax Reconciliation, Nondeductible Expense 653us-gaap_IncomeTaxReconciliationNondeductibleExpense 235us-gaap_IncomeTaxReconciliationNondeductibleExpense 214us-gaap_IncomeTaxReconciliationNondeductibleExpense
Income Tax Reconciliation, Nondeductible Expense, Other 434us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther 606us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther 0us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther
Effective income tax reconciliation, purchase accounting adjustment 990pro_Effectiveincometaxreconciliationpurchaseaccountingadjustment 0pro_Effectiveincometaxreconciliationpurchaseaccountingadjustment 0pro_Effectiveincometaxreconciliationpurchaseaccountingadjustment
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount 837us-gaap_IncomeTaxReconciliationTaxCreditsForeign 135us-gaap_IncomeTaxReconciliationTaxCreditsForeign 111us-gaap_IncomeTaxReconciliationTaxCreditsForeign
Income Tax Reconciliation, Deductions, Qualified Production Activities 0us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities (47)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities (146)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities
Income Tax Reconciliation, Nondeductible Expense, Share-based Compensation Cost 1,784us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost 1,308us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost 622us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
Research and Expirmentation Tax Credit Adjustment Prior Years 59pro_ResearchAndExpirmentationTaxCreditAdjustmentPriorYears (1,254)pro_ResearchAndExpirmentationTaxCreditAdjustmentPriorYears (439)pro_ResearchAndExpirmentationTaxCreditAdjustmentPriorYears
Income Tax Reconciliation, Tax Credits (3,259)us-gaap_IncomeTaxReconciliationTaxCredits (2,165)us-gaap_IncomeTaxReconciliationTaxCredits (111)us-gaap_IncomeTaxReconciliationTaxCredits
Income Tax Reconciliation, Other Adjustments (40)us-gaap_IncomeTaxReconciliationOtherAdjustments (30)us-gaap_IncomeTaxReconciliationOtherAdjustments 158us-gaap_IncomeTaxReconciliationOtherAdjustments
Income Tax Reconciliation, Change in Deferred Tax Assets Valuation Allowance 19,506us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 509us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 0us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Income Tax Expense (Benefit) $ 12,493us-gaap_IncomeTaxExpenseBenefit $ (173)us-gaap_IncomeTaxExpenseBenefit $ 3,051us-gaap_IncomeTaxExpenseBenefit