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Consolidated Statements of Cash Flows (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash flows from operating activities:      
Net loss $ (10,612,000)us-gaap_NetIncomeLoss $ (4,747,000)us-gaap_NetIncomeLoss $ (6,548,000)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:      
Stock-based compensation 3,299,000us-gaap_ShareBasedCompensation 3,110,000us-gaap_ShareBasedCompensation 3,160,000us-gaap_ShareBasedCompensation
Tax benefit (deficit) from stock-based compensation     6,000cutr_TaxBenefitDeficitFromStockbasedCompensation
Excess tax benefit related to stock-based compensation     (6,000)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Depreciation and amortization 1,336,000us-gaap_DepreciationDepletionAndAmortization 1,304,000us-gaap_DepreciationDepletionAndAmortization 1,606,000us-gaap_DepreciationDepletionAndAmortization
Impairment of intangible assets 650,000us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill    
Other 206,000us-gaap_OtherOperatingActivitiesCashFlowStatement 243,000us-gaap_OtherOperatingActivitiesCashFlowStatement (87,000)us-gaap_OtherOperatingActivitiesCashFlowStatement
Changes in assets and liabilities:      
Accounts receivable (1,460,000)us-gaap_IncreaseDecreaseInAccountsReceivable (857,000)us-gaap_IncreaseDecreaseInAccountsReceivable (3,690,000)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories (1,982,000)us-gaap_IncreaseDecreaseInInventories 2,108,000us-gaap_IncreaseDecreaseInInventories 1,167,000us-gaap_IncreaseDecreaseInInventories
Other current assets and prepaid expenses 239,000us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 345,000us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 859,000us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Other long-term assets (37,000)us-gaap_IncreaseDecreaseInOtherNoncurrentAssets 73,000us-gaap_IncreaseDecreaseInOtherNoncurrentAssets 89,000us-gaap_IncreaseDecreaseInOtherNoncurrentAssets
Accounts payable 1,263,000us-gaap_IncreaseDecreaseInAccountsPayableTrade (287,000)us-gaap_IncreaseDecreaseInAccountsPayableTrade (466,000)us-gaap_IncreaseDecreaseInAccountsPayableTrade
Accrued liabilities 1,650,000us-gaap_IncreaseDecreaseInAccruedLiabilities (371,000)us-gaap_IncreaseDecreaseInAccruedLiabilities (177,000)us-gaap_IncreaseDecreaseInAccruedLiabilities
Other long-term liabilities (285,000)us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities (218,000)us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities (62,000)us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities
Deferred revenue 1,410,000us-gaap_IncreaseDecreaseInDeferredRevenue 3,114,000us-gaap_IncreaseDecreaseInDeferredRevenue 1,915,000us-gaap_IncreaseDecreaseInDeferredRevenue
Income tax liability 37,000us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable (304,000)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable (66,000)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Net cash provided by (used in) operating activities (4,286,000)us-gaap_NetCashProvidedByUsedInOperatingActivities 3,513,000us-gaap_NetCashProvidedByUsedInOperatingActivities (2,300,000)us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:      
Acquisition of property, equipment and software (734,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (517,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (516,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Acquisition of intangible asset   (155,000)us-gaap_PaymentsToAcquireIntangibleAssets  
Business acquisition     (5,091,000)us-gaap_PaymentsToAcquireBusinessesGross
Disposal of property and equipment   63,000us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment  
Proceeds from sales of marketable and long-term investments 12,354,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 15,578,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 31,564,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Proceeds from maturities of marketable investments 26,915,000us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities 36,030,000us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities 43,009,000us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
Purchase of marketable investments (44,146,000)us-gaap_PaymentsToAcquireMarketableSecurities (56,847,000)us-gaap_PaymentsToAcquireMarketableSecurities (58,813,000)us-gaap_PaymentsToAcquireMarketableSecurities
Net cash (used in) provided by investing activities (5,611,000)us-gaap_NetCashProvidedByUsedInInvestingActivities (5,848,000)us-gaap_NetCashProvidedByUsedInInvestingActivities 10,153,000us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:      
Repurchase of common stock   (10,031,000)us-gaap_PaymentsForRepurchaseOfCommonStock  
Proceeds from exercise of stock options and employee stock purchase plan 3,602,000us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 5,189,000us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 1,667,000us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
Payments on capital lease obligation (144,000)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (127,000)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations  
Excess tax benefit related to stock-based compensation     6,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Net cash provided by (used in) financing activities 3,458,000us-gaap_NetCashProvidedByUsedInFinancingActivities (4,969,000)us-gaap_NetCashProvidedByUsedInFinancingActivities 1,673,000us-gaap_NetCashProvidedByUsedInFinancingActivities
Net (decrease) increase in cash and cash equivalents (6,439,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (7,304,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 9,526,000us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year 16,242,000us-gaap_CashAndCashEquivalentsAtCarryingValue 23,546,000us-gaap_CashAndCashEquivalentsAtCarryingValue 14,020,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year 9,803,000us-gaap_CashAndCashEquivalentsAtCarryingValue 16,242,000us-gaap_CashAndCashEquivalentsAtCarryingValue 23,546,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental cash flow information:      
Cash paid for interest 26,000us-gaap_InterestPaid 19,000us-gaap_InterestPaid  
Cash paid for income taxes 225,000us-gaap_IncomeTaxesPaidNet 337,000us-gaap_IncomeTaxesPaidNet 307,000us-gaap_IncomeTaxesPaidNet
Supplemental non-cash investing and financing activities:      
Assets acquired under capital lease $ 70,000us-gaap_CapitalLeaseObligationsIncurred $ 577,000us-gaap_CapitalLeaseObligationsIncurred