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Consolidated Balance Sheets (USD $)
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 115,464,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 89,371,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, net of allowances of $381 and $354, respectively 37,725,000us-gaap_AccountsReceivableNetCurrent 34,860,000us-gaap_AccountsReceivableNetCurrent
Deferred tax assets - current portion 3,343,000us-gaap_DeferredTaxAssetsNetCurrent 5,920,000us-gaap_DeferredTaxAssetsNetCurrent
Prepaid expenses and other current assets 2,888,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent 3,632,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 159,420,000us-gaap_AssetsCurrent 133,783,000us-gaap_AssetsCurrent
Property and equipment, net 8,832,000us-gaap_PropertyPlantAndEquipmentNet 7,064,000us-gaap_PropertyPlantAndEquipmentNet
Intangible assets, net 0us-gaap_IntangibleAssetsNetExcludingGoodwill 31,000us-gaap_IntangibleAssetsNetExcludingGoodwill
Deferred tax assets - long-term portion 8,025,000us-gaap_DeferredTaxAssetsNetNoncurrent 8,599,000us-gaap_DeferredTaxAssetsNetNoncurrent
Other non-current assets 1,161,000us-gaap_OtherAssetsNoncurrent 1,687,000us-gaap_OtherAssetsNoncurrent
Total assets 177,438,000us-gaap_Assets 151,164,000us-gaap_Assets
Current liabilities:    
Accounts payable 803,000us-gaap_AccountsPayableCurrent 1,129,000us-gaap_AccountsPayableCurrent
Accrued compensation and related benefits 6,112,000us-gaap_EmployeeRelatedLiabilitiesCurrent 7,707,000us-gaap_EmployeeRelatedLiabilitiesCurrent
Accrued and other current liabilities 1,733,000us-gaap_AccruedLiabilitiesCurrent 1,593,000us-gaap_AccruedLiabilitiesCurrent
Deferred revenues - current portion 3,740,000us-gaap_DeferredRevenueCurrent 2,096,000us-gaap_DeferredRevenueCurrent
Billings in excess of recognized revenues   343,000us-gaap_BillingsInExcessOfCost
Total current liabilities 12,388,000us-gaap_LiabilitiesCurrent 12,868,000us-gaap_LiabilitiesCurrent
Long-term income taxes payable 2,600,000us-gaap_AccruedIncomeTaxesNoncurrent 2,956,000us-gaap_AccruedIncomeTaxesNoncurrent
Other non-current liabilities 627,000us-gaap_OtherLiabilitiesNoncurrent 628,000us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 15,615,000us-gaap_Liabilities 16,452,000us-gaap_Liabilities
Commitments and contingencies (Note 5)      
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 36,258 and 35,285, respectively; shares outstanding 31,116 and 30,437, respectively 5,000us-gaap_CommonStockValue 5,000us-gaap_CommonStockValue
Additional paid-in capital 248,734,000us-gaap_AdditionalPaidInCapital 233,813,000us-gaap_AdditionalPaidInCapital
Treasury stock, at cost, 5,142 and 4,848 shares, respectively (34,048,000)us-gaap_TreasuryStockValue (28,905,000)us-gaap_TreasuryStockValue
Accumulated deficit (52,187,000)us-gaap_RetainedEarningsAccumulatedDeficit (70,649,000)us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive income (681,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 448,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders’ equity 161,823,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 134,712,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total liabilities and stockholders’ equity $ 177,438,000us-gaap_LiabilitiesAndStockholdersEquity $ 151,164,000us-gaap_LiabilitiesAndStockholdersEquity