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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Statement of Cash Flows [Abstract]    
Cash paid for interest $ 3us-gaap_InterestPaid $ 0us-gaap_InterestPaid
Cash flows from operating activities:    
Net income 5,596us-gaap_ProfitLoss 5,179us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by (used in) operations:    
Depreciation and amortization expense 1,972us-gaap_OtherDepreciationAndAmortization 1,422us-gaap_OtherDepreciationAndAmortization
Amortization of deferred rent (79)us-gaap_OtherAmortizationOfDeferredCharges (110)us-gaap_OtherAmortizationOfDeferredCharges
Stock-based compensation expense 401us-gaap_EmployeeBenefitsAndShareBasedCompensation 296us-gaap_EmployeeBenefitsAndShareBasedCompensation
Provision for doubtful accounts (71)us-gaap_ProvisionForDoubtfulAccounts 69us-gaap_ProvisionForDoubtfulAccounts
Write-down of inventory to net realizable value 946us-gaap_InventoryWriteDown 996us-gaap_InventoryWriteDown
Loss on disposal of assets 0us-gaap_GainLossOnDispositionOfAssets 49us-gaap_GainLossOnDispositionOfAssets
Tax benefit from exercise of stock options (211)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (104)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Changes in operating assets and liabilities:    
Receivables (251)us-gaap_IncreaseDecreaseInReceivables (1,059)us-gaap_IncreaseDecreaseInReceivables
Inventories (2,614)us-gaap_IncreaseDecreaseInInventories (998)us-gaap_IncreaseDecreaseInInventories
Deferred income taxes (495)us-gaap_IncreaseDecreaseInDeferredIncomeTaxes (6)us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
Prepaid expenses and other assets 844us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (1,251)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable (84)us-gaap_IncreaseDecreaseInAccountsPayable 428us-gaap_IncreaseDecreaseInAccountsPayable
Accrued liabilities 1,451us-gaap_IncreaseDecreaseInAccruedLiabilities (408)us-gaap_IncreaseDecreaseInAccruedLiabilities
Income taxes payable (947)us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable (14,782)us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable
Deferred product revenue 858us-gaap_IncreaseDecreaseInDeferredRevenue 565us-gaap_IncreaseDecreaseInDeferredRevenue
Other long-term liabilities (606)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet (238)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net cash provided by (used in) operating activities 6,710us-gaap_NetCashProvidedByUsedInOperatingActivities (9,952)us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:    
Payment towards business acquisitions (13,068)us-gaap_OtherPaymentsToAcquireBusinesses 0us-gaap_OtherPaymentsToAcquireBusinesses
Purchase of property and equipment (642)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (1,040)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchase of patents (90)us-gaap_PaymentsToAcquireIntangibleAssets 0us-gaap_PaymentsToAcquireIntangibleAssets
Proceeds from maturities of marketable investment securities 4,650us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities 0us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
Purchase of marketable securities (5,266)us-gaap_PaymentsToAcquireMarketableSecurities (25,502)us-gaap_PaymentsToAcquireMarketableSecurities
Net cash used in investing activities (14,416)us-gaap_NetCashProvidedByUsedInInvestingActivities (26,542)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:    
Proceeds from the exercise of stock options 1,337us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 489us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
Tax benefit from the exercise of stock options 211us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 104us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Stock registration costs (55)us-gaap_PaymentsOfStockIssuanceCosts 0us-gaap_PaymentsOfStockIssuanceCosts
Dividend payments (914)us-gaap_PaymentsOfDividends 0us-gaap_PaymentsOfDividends
Treasury stock purchased (2,598)us-gaap_PaymentsForRepurchaseOfCommonStock (2,416)us-gaap_PaymentsForRepurchaseOfCommonStock
Net cash (used in) financing activities (2,019)us-gaap_NetCashProvidedByUsedInFinancingActivities (1,823)us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash and cash equivalents (27)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net (decrease) in cash and cash equivalents (9,752)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (38,317)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at the beginning of the period 17,192us-gaap_CashAndCashEquivalentsAtCarryingValue 55,509us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at the end of the period 7,440us-gaap_CashAndCashEquivalentsAtCarryingValue 17,192us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosure of cash flow information:    
Cash paid for interest 3us-gaap_InterestPaid 0us-gaap_InterestPaid
Cash paid for income taxes 3,017us-gaap_IncomeTaxesPaid 18,021us-gaap_IncomeTaxesPaid
Issuance of common stock in connection with acquisition of Sabine $ 1,679us-gaap_StockIssuedDuringPeriodValueAcquisitions $ 0us-gaap_StockIssuedDuringPeriodValueAcquisitions