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Condensed Consolidated Balance Sheets (USD $)
Mar. 31, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 3,370,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 5,974,000us-gaap_CashAndCashEquivalentsAtCarryingValue [1]
Restricted cash 303,000us-gaap_RestrictedCashAndCashEquivalents 303,000us-gaap_RestrictedCashAndCashEquivalents [1]
Investments - short term 2,674,000us-gaap_AvailableForSaleSecuritiesCurrent 3,249,000us-gaap_AvailableForSaleSecuritiesCurrent [1]
Accounts receivable, net of allowance for doubtful accounts of $1,434,000 and $1,371,000 in 2014 and 2015, respectively 12,574,000us-gaap_AccountsReceivableNetCurrent 14,783,000us-gaap_AccountsReceivableNetCurrent [1]
Financing receivables - current, net of allowance for doubtful accounts of $-0- in 2014 and 2015 1,858,000us-gaap_NotesAndLoansReceivableNetCurrent 1,898,000us-gaap_NotesAndLoansReceivableNetCurrent [1]
Inventory, net 7,796,000us-gaap_InventoryNet 6,252,000us-gaap_InventoryNet [1]
Deferred costs - current 2,595,000us-gaap_DeferredCostsCurrent 2,183,000us-gaap_DeferredCostsCurrent [1]
Prepaid expenses and other current assets 1,716,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent 1,767,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent [1]
Total current assets 32,886,000us-gaap_AssetsCurrent 36,409,000us-gaap_AssetsCurrent [1]
Investments - long term 4,659,000us-gaap_AvailableForSaleSecuritiesNoncurrent 4,066,000us-gaap_AvailableForSaleSecuritiesNoncurrent [1]
Financing receivables - less current portion 3,762,000us-gaap_NotesAndLoansReceivableNetNoncurrent 4,072,000us-gaap_NotesAndLoansReceivableNetNoncurrent [1]
Deferred costs - less current portion 2,779,000us-gaap_DeferredCosts 3,281,000us-gaap_DeferredCosts [1]
Fixed assets, net 2,047,000us-gaap_PropertyPlantAndEquipmentNet 1,520,000us-gaap_PropertyPlantAndEquipmentNet [1]
Goodwill 1,837,000us-gaap_Goodwill 1,837,000us-gaap_Goodwill [1]
Intangible assets, net 943,000us-gaap_IntangibleAssetsNetExcludingGoodwill 977,000us-gaap_IntangibleAssetsNetExcludingGoodwill [1]
Other assets 354,000us-gaap_OtherAssetsNoncurrent 324,000us-gaap_OtherAssetsNoncurrent [1]
Assets, Total 49,267,000us-gaap_Assets 52,486,000us-gaap_Assets [1]
Current liabilities:    
Accounts payable and accrued expenses 11,608,000us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent 10,102,000us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent [1]
Capital lease obligation - current 110,000us-gaap_CapitalLeaseObligationsCurrent 149,000us-gaap_CapitalLeaseObligationsCurrent [1]
Deferred revenue - current 6,499,000us-gaap_DeferredRevenueCurrent 6,742,000us-gaap_DeferredRevenueCurrent [1]
Total current liabilities 18,217,000us-gaap_LiabilitiesCurrent 16,993,000us-gaap_LiabilitiesCurrent [1]
Deferred rent 301,000us-gaap_DeferredRentCreditNoncurrent 309,000us-gaap_DeferredRentCreditNoncurrent [1]
Deferred revenue - less current portion 7,330,000us-gaap_DeferredRevenueNoncurrent 7,929,000us-gaap_DeferredRevenueNoncurrent [1]
Liabilities, Total 25,848,000us-gaap_Liabilities 25,231,000us-gaap_Liabilities [1]
Commitments and Contingencies      
STOCKHOLDERS' EQUITY    
Preferred stock; authorized 5,000,000 shares, $0.01 par value; none issued 0us-gaap_PreferredStockValue 0us-gaap_PreferredStockValue [1]
Common stock; authorized 50,000,000 shares, $0.01 par value; 13,476,000 and 13,500,000 shares issued at December 31, 2014 and March 31, 2015, respectively; shares outstanding, 12,812,000 and 12,817,000 at December 31, 2014 and March 31, 2015, respectively 124,000us-gaap_CommonStockValue 124,000us-gaap_CommonStockValue [1]
Additional paid-in capital 106,815,000us-gaap_AdditionalPaidInCapitalCommonStock 106,272,000us-gaap_AdditionalPaidInCapitalCommonStock [1]
Accumulated deficit (79,121,000)us-gaap_RetainedEarningsAccumulatedDeficit (75,176,000)us-gaap_RetainedEarningsAccumulatedDeficit [1]
Accumulated other comprehensive loss (692,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (375,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax [1]
Treasury stock; 664,000 shares and 683,000 shares at cost at December 31, 2014 and March 31, 2015, respectively (3,707,000)us-gaap_TreasuryStockValue (3,590,000)us-gaap_TreasuryStockValue [1]
Total stockholders' equity 23,419,000us-gaap_StockholdersEquity 27,255,000us-gaap_StockholdersEquity [1]
Total liabilities and stockholders' equity $ 49,267,000us-gaap_LiabilitiesAndStockholdersEquity $ 52,486,000us-gaap_LiabilitiesAndStockholdersEquity [1]
[1] Derived from audited balance sheet as of December 31, 2014.