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Condensed Consolidated Balance Sheets (Unaudited) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 161,019us-gaap_CashAndCashEquivalentsAtCarryingValue $ 44,688us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts and unbilled receivables, net of allowance of $XXX and $1,130, respectively 71,095pro_AccountAndUnbilledReceivablesNet 46,566pro_AccountAndUnbilledReceivablesNet
Prepaid and other current assets 8,075us-gaap_PrepaidExpenseAndOtherAssetsCurrent 6,157us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Restricted Cash and Cash Equivalents, Current 100us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue 39,718us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Total current assets 240,289us-gaap_AssetsCurrent 137,129us-gaap_AssetsCurrent
Restricted cash 0us-gaap_RestrictedCashAndInvestmentsNoncurrent 100us-gaap_RestrictedCashAndInvestmentsNoncurrent
Property and equipment, net 15,788us-gaap_PropertyPlantAndEquipmentNet 15,587us-gaap_PropertyPlantAndEquipmentNet
Intangible Assets, Net (Excluding Goodwill) 20,195us-gaap_IntangibleAssetsNetExcludingGoodwill 8,232us-gaap_IntangibleAssetsNetExcludingGoodwill
Goodwill 21,563us-gaap_Goodwill 7,024us-gaap_Goodwill
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent 0us-gaap_DeferredTaxAssetsNetNoncurrent 10,505us-gaap_DeferredTaxAssetsNetNoncurrent
Other long term assets, net 2,290us-gaap_OtherAssetsNoncurrent 1,251us-gaap_OtherAssetsNoncurrent
Total assets 300,125us-gaap_Assets 179,828us-gaap_Assets
Current liabilities:    
Accounts payable 10,564us-gaap_AccountsPayableCurrent 7,839us-gaap_AccountsPayableCurrent
Accrued liabilities 5,355us-gaap_AccruedLiabilitiesCurrent 5,210us-gaap_AccruedLiabilitiesCurrent
Accrued payroll and other employee benefits 15,154us-gaap_EmployeeRelatedLiabilitiesCurrent 9,679us-gaap_EmployeeRelatedLiabilitiesCurrent
Deferred revenue 57,313us-gaap_DeferredRevenueCurrent 42,274us-gaap_DeferredRevenueCurrent
Total current liabilities 88,386us-gaap_LiabilitiesCurrent 65,002us-gaap_LiabilitiesCurrent
Long-term deferred revenue 1,121us-gaap_DeferredRevenueNoncurrent 2,977us-gaap_DeferredRevenueNoncurrent
Convertible Debt, Noncurrent 110,448us-gaap_ConvertibleDebtNoncurrent 0us-gaap_ConvertibleDebtNoncurrent
Other Liabilities, Noncurrent 1,171us-gaap_OtherLiabilitiesNoncurrent 546us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 201,126us-gaap_Liabilities 68,525us-gaap_Liabilities
Commitments and contingencies (Note 13)      
Stockholders' equity:    
Preferred stock, $0.001 par value, 5,000,000 shares authorized none issued 0us-gaap_PreferredStockValue 0us-gaap_PreferredStockValue
Common stock, $0.001 par value, 75,000,000 shares authorized, XXX and 31,432,430 shares issued, respectively, XXX and 27,014,845 shares outstanding, respectively 34us-gaap_CommonStockValue 33us-gaap_CommonStockValue
Additional paid-in capital 134,375us-gaap_AdditionalPaidInCapital 106,880us-gaap_AdditionalPaidInCapital
Treasury stock, 4,417,585 common shares, at cost (13,938)us-gaap_TreasuryStockValue (13,938)us-gaap_TreasuryStockValue
Retained earnings (19,223)us-gaap_RetainedEarningsAccumulatedDeficit 18,328us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated Other Comprehensive Income (Loss), Net of Tax (2,249)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 0us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders' equity 98,999us-gaap_StockholdersEquity 111,303us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 300,125us-gaap_LiabilitiesAndStockholdersEquity $ 179,828us-gaap_LiabilitiesAndStockholdersEquity