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Accounts Receivable and Contracts in Progress (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts Receivable, Gross | $ 64,004,000us-gaap_AccountsReceivableGross | $ 40,842,000us-gaap_AccountsReceivableGross |
Unbilled Receivables, Current | 7,959,000us-gaap_UnbilledReceivablesCurrent | 6,784,000us-gaap_UnbilledReceivablesCurrent |
Accounts Receivable, Net, Current | 71,963,000us-gaap_AccountsReceivableNetCurrent | 47,626,000us-gaap_AccountsReceivableNetCurrent |
Allowance for Doubtful Accounts Receivable | (868,000)us-gaap_AllowanceForDoubtfulAccountsReceivable | (1,060,000)us-gaap_AllowanceForDoubtfulAccountsReceivable |
Account and Unbilled Receivables, Net | 71,095,000pro_AccountAndUnbilledReceivablesNet | 46,566,000pro_AccountAndUnbilledReceivablesNet |
Allowance for Loan and Lease Losses, Provision for Loss, Net | (100,000)us-gaap_ProvisionForLoanAndLeaseLosses | 400,000us-gaap_ProvisionForLoanAndLeaseLosses | (300,000)us-gaap_ProvisionForLoanAndLeaseLosses
Deferred Revenue, Revenue Recognized | 349,874,000us-gaap_DeferredRevenueRevenueRecognized | 221,905,000us-gaap_DeferredRevenueRevenueRecognized |
Deferred Revenue and Credits | (400,349,000)us-gaap_DeferredRevenueAndCredits | (260,372,000)us-gaap_DeferredRevenueAndCredits |
Deferred Revenue, Period Increase (Decrease) | (50,475,000)us-gaap_DeferredRevenuePeriodIncreaseDecrease | (38,467,000)us-gaap_DeferredRevenuePeriodIncreaseDecrease |
Deferred Revenue | (58,434,000)us-gaap_DeferredRevenue | (45,251,000)us-gaap_DeferredRevenue |
Deferred Maintenance and Support Revenue | $ 20,200,000pro_DeferredMaintenanceAndSupportRevenue | $ 11,400,000pro_DeferredMaintenanceAndSupportRevenue |

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- Definition Accounts receivables represents the amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. Unbilled receivables represent the amount due for services rendered or products shipped, but not yet billed, recognized in conformity with revenue recognition criteria. + References No definition available. + Details
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- Definition Deferred Maintenance and Support Revenue + References No definition available. + Details
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- Details
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- Definition For unclassified balance sheet, amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.9) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + 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 210.5-02.3-4) -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 3 -Subparagraph a(1) -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 + Details
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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response) -URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780 + Details
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- Definition Amount of previously reported deferred or unearned revenue that was recognized as revenue during the period. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A + Details
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