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Condensed Consolidated Balance Sheets (Unaudited) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 131,880us-gaap_CashAndCashEquivalentsAtCarryingValue $ 115,464us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, net of allowance of $299 and $381, respectively 29,193us-gaap_AccountsReceivableNetCurrent 37,725us-gaap_AccountsReceivableNetCurrent
Deferred tax assets - current portion 3,317us-gaap_DeferredTaxAssetsNetCurrent 3,343us-gaap_DeferredTaxAssetsNetCurrent
Prepaid expenses and other current assets 2,901us-gaap_PrepaidExpenseAndOtherAssetsCurrent 2,888us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 167,291us-gaap_AssetsCurrent 159,420us-gaap_AssetsCurrent
Property and equipment, net 9,895us-gaap_PropertyPlantAndEquipmentNet 8,832us-gaap_PropertyPlantAndEquipmentNet
Deferred tax assets - non-current portion 7,643us-gaap_DeferredTaxAssetsNetNoncurrent 8,025us-gaap_DeferredTaxAssetsNetNoncurrent
Other non-current assets 1,448us-gaap_OtherAssetsNoncurrent 1,161us-gaap_OtherAssetsNoncurrent
Total assets 186,277us-gaap_Assets 177,438us-gaap_Assets
Current liabilities:    
Accounts payable 1,235us-gaap_AccountsPayableCurrent 803us-gaap_AccountsPayableCurrent
Accrued compensation and related benefits 3,988us-gaap_EmployeeRelatedLiabilitiesCurrent 6,112us-gaap_EmployeeRelatedLiabilitiesCurrent
Accrued and other current liabilities 1,588us-gaap_AccruedLiabilitiesCurrent 1,733us-gaap_AccruedLiabilitiesCurrent
Deferred revenues 5,265us-gaap_DeferredRevenueCurrent 3,740us-gaap_DeferredRevenueCurrent
Total current liabilities 12,076us-gaap_LiabilitiesCurrent 12,388us-gaap_LiabilitiesCurrent
Non-current liabilities 2,924us-gaap_LiabilitiesNoncurrent 3,227us-gaap_LiabilitiesNoncurrent
Total liabilities 15,000us-gaap_Liabilities 15,615us-gaap_Liabilities
Commitments and contingencies (Note 9)      
Stockholders’ equity:    
Preferred stock, $0.00015 par value, 5,000 shares authorized, no shares issued and outstanding 0us-gaap_PreferredStockValue 0us-gaap_PreferredStockValue
Common stock, $0.00015 par value, 70,000 shares authorized: shares issued 36,791 and 36,258, respectively; shares outstanding 31,449 and 31,116, respectively 5us-gaap_CommonStockValue 5us-gaap_CommonStockValue
Additional paid-in-capital 256,576us-gaap_AdditionalPaidInCapital 248,734us-gaap_AdditionalPaidInCapital
Treasury stock at cost, 5,342 and 5,142 shares, respectively (37,655)us-gaap_TreasuryStockValue (34,048)us-gaap_TreasuryStockValue
Accumulated deficit (46,220)us-gaap_RetainedEarningsAccumulatedDeficit (52,187)us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive income (1,429)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (681)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders’ equity 171,277us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 161,823us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total liabilities and stockholders’ equity $ 186,277us-gaap_LiabilitiesAndStockholdersEquity $ 177,438us-gaap_LiabilitiesAndStockholdersEquity