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Consolidated Statement of Shareholders Equity (USD $)	Total	Stockholders' Equity, Total [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Common Stock [Member]
Stockholders' Equity Attributable to Parent at Dec. 31, 2011		$ 73,943,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember	$ 77,934,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	$ (13,938,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember	$ 9,916,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	$ 31,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Common stock - shares outstanding, beginning balance at Dec. 31, 2011						27,014,845us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Treasury stock - shares, beginning balance at Dec. 31, 2011				4,417,585us-gaap_TreasuryStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Accumulated Other Comprehensive Income (Loss), Net of Tax	0us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Value, New Issues						126,604us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Exercise of stock options		1,354,000us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember
Proceeds from Stock Options Exercised	1,354,000us-gaap_ProceedsFromStockOptionsExercised		1,354,000us-gaap_ProceedsFromStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures						407,398us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Stock Issued During Period, Value, Restricted Stock Award, Gross		(2,813,000)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember	(2,814,000)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember			1,000us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Proceeds and Excess Tax Benefit from Share-based Compensation		1,574,000us-gaap_ProceedsAndExcessTaxBenefitFromSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember	1,574,000us-gaap_ProceedsAndExcessTaxBenefitFromSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Proceeds from Issuance of Warrants	0us-gaap_ProceedsFromIssuanceOfWarrants
Purchase of convertible bond hedge	0pro_Purchaseofconvertiblebondhedge
Share-based Compensation	9,645,000us-gaap_ShareBasedCompensation	9,645,000us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember	9,645,000us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Net Income (Loss) Attributable to Parent	4,966,000us-gaap_NetIncomeLoss	4,966,000us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember	0us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember		4,966,000us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Net Income (Loss) Attributable to Noncontrolling Interest	0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Stockholders' Equity Attributable to Parent at Dec. 31, 2012		88,669,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember	87,693,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	(13,938,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember	14,882,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	32,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Common stock - shares outstanding, ending balance at Dec. 31, 2012						27,548,847us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Treasury stock - shares, ending balance at Dec. 31, 2012				4,417,585us-gaap_TreasuryStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Accumulated Other Comprehensive Income (Loss), Net of Tax	0us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Value, New Issues						354,973us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Exercise of stock options		3,327,000us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember				1,000us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Proceeds from Stock Options Exercised	3,327,000us-gaap_ProceedsFromStockOptionsExercised		3,326,000us-gaap_ProceedsFromStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures						284,823us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Stock Issued During Period, Value, Restricted Stock Award, Gross		(3,342,000)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember	(3,342,000)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Proceeds and Excess Tax Benefit from Share-based Compensation		2,931,000us-gaap_ProceedsAndExcessTaxBenefitFromSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember	2,931,000us-gaap_ProceedsAndExcessTaxBenefitFromSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Proceeds from Issuance of Warrants	0us-gaap_ProceedsFromIssuanceOfWarrants
Purchase of convertible bond hedge	0pro_Purchaseofconvertiblebondhedge
Share-based Compensation	16,272,000us-gaap_ShareBasedCompensation	16,272,000us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember	16,272,000us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Net Income (Loss) Attributable to Parent	3,446,000us-gaap_NetIncomeLoss	3,446,000us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember	0us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember		3,446,000us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Net Income (Loss) Attributable to Noncontrolling Interest	0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Stockholders' Equity Attributable to Parent at Dec. 31, 2013	111,303,000us-gaap_StockholdersEquity	111,303,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember	106,880,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	(13,938,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember	18,328,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	33,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Common stock - shares outstanding, ending balance at Dec. 31, 2013	28,188,643us-gaap_CommonStockSharesOutstanding					28,188,643us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Treasury stock - shares, ending balance at Dec. 31, 2013	4,417,585us-gaap_TreasuryStockShares			4,417,585us-gaap_TreasuryStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Accumulated Other Comprehensive Income (Loss), Net of Tax	(2,249,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Value, New Issues						214,162us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Exercise of stock options		1,105,000us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember
Proceeds from Stock Options Exercised	1,105,000us-gaap_ProceedsFromStockOptionsExercised		1,105,000us-gaap_ProceedsFromStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures						644,028us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Stock Issued During Period, Value, Restricted Stock Award, Gross		(13,088,000)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember	(13,089,000)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember			1,000us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Stock Issued During Period, Shares, Employee Stock Purchase Plans	13,392us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
Proceeds and Excess Tax Benefit from Share-based Compensation		(110,000)us-gaap_ProceedsAndExcessTaxBenefitFromSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember	335,000us-gaap_ProceedsAndExcessTaxBenefitFromSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Proceeds from Issuance of Warrants	17,106,000us-gaap_ProceedsFromIssuanceOfWarrants
Change in equity - purchase of convertible bond hedge	(29,411,000)pro_Changeinequitypurchaseofconvertiblebondhedge
Purchase of convertible bond hedge	29,411,000pro_Purchaseofconvertiblebondhedge
Share-based Compensation	22,665,000us-gaap_ShareBasedCompensation	22,845,000us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember	22,845,000us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(2,249,000)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Net Income (Loss) Attributable to Parent	(36,644,000)us-gaap_NetIncomeLoss	(37,551,000)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember
Net Income (Loss) Attributable to Noncontrolling Interest	(907,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Cumulative earnings previously allocated to NCI and re-allocated to Parent's equity	907,000pro_CumulativeearningspreviouslyallocatedtoNCIandreallocatedtoParentsequity
Stockholders' Equity Attributable to Parent at Dec. 31, 2014	$ 98,999,000us-gaap_StockholdersEquity	$ 98,999,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember	$ 134,375,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	$ (13,938,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember	$ (19,223,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	$ 34,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Common stock - shares outstanding, ending balance at Dec. 31, 2014	29,060,225us-gaap_CommonStockSharesOutstanding					29,060,225us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Treasury stock - shares, ending balance at Dec. 31, 2014	4,417,585us-gaap_TreasuryStockShares			4,417,585us-gaap_TreasuryStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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-Name Regulation S-X (SX)

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Number of new stock issued during the period.

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Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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Aggregate value of stock related to Restricted Stock Awards issued during the period.

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Value of stock issued as a result of the exercise of stock options.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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