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CONSOLIDATED BALANCE SHEETS (unaudited) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 44,685us-gaap_CashAndCashEquivalentsAtCarryingValue $ 43,985us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, net 3,251us-gaap_AccountsReceivableNetCurrent 3,619us-gaap_AccountsReceivableNetCurrent
Inventories 2us-gaap_InventoryNet 2us-gaap_InventoryNet
Deferred tax assets 187us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 168us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Prepaid expenses and other current assets 915us-gaap_PrepaidExpenseAndOtherAssetsCurrent 401us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 49,040us-gaap_AssetsCurrent 48,175us-gaap_AssetsCurrent
Property and equipment, net 5,195us-gaap_PropertyPlantAndEquipmentNet 5,289us-gaap_PropertyPlantAndEquipmentNet
Investments 925us-gaap_AvailableForSaleSecuritiesDebtSecuritiesNoncurrent 1,428us-gaap_AvailableForSaleSecuritiesDebtSecuritiesNoncurrent
Long term deferred tax assets 600us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent 804us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Other assets 480us-gaap_OtherAssetsNoncurrent 197us-gaap_OtherAssetsNoncurrent
Total assets 56,240us-gaap_Assets 55,893us-gaap_Assets
Current liabilities:    
Accounts payable 191us-gaap_AccountsPayableCurrent 258us-gaap_AccountsPayableCurrent
Accrued expenses 833us-gaap_AccruedLiabilitiesCurrent 820us-gaap_AccruedLiabilitiesCurrent
Deferred revenue 1,952us-gaap_DeferredRevenueCurrent 2,352us-gaap_DeferredRevenueCurrent
Total current liabilities 2,976us-gaap_LiabilitiesCurrent 3,430us-gaap_LiabilitiesCurrent
Long-term deferred revenue 79us-gaap_DeferredRevenueNoncurrent 74us-gaap_DeferredRevenueNoncurrent
Commitments and contingent liabilities      
Stockholders' equity:    
Preferred stock, $1.00 par value; 1,000,000 shares authorized, none outstanding      
Common stock, $.01 par value; 70,000,000 shares authorized; issued and outstanding 22,865,565 as of March 31, 2015 and 22,808,761 as of December 31, 2014 229us-gaap_CommonStockValue 228us-gaap_CommonStockValue
Additional paid-in capital 104,271us-gaap_AdditionalPaidInCapitalCommonStock 103,756us-gaap_AdditionalPaidInCapitalCommonStock
Accumulated other comprehensive loss (21)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (29)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Accumulated deficit (51,294)us-gaap_RetainedEarningsAccumulatedDeficit (51,566)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity 53,185us-gaap_StockholdersEquity 52,389us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 56,240us-gaap_LiabilitiesAndStockholdersEquity $ 55,893us-gaap_LiabilitiesAndStockholdersEquity