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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 $ (5,159,000)us-gaap_NetIncomeLoss $ (2,703,000)us-gaap_NetIncomeLoss $ (3,785,000)us-gaap_NetIncomeLoss
Allowance for/(recovery of) doubtful accounts and returns 4,000inph_RecoveryOfProvisionForUncollectibleAccountsAndReturns 19,000inph_RecoveryOfProvisionForUncollectibleAccountsAndReturns (4,000)inph_RecoveryOfProvisionForUncollectibleAccountsAndReturns
Writedowns of excess and obsolete inventories 1,072,000us-gaap_InventoryWriteDown 120,000us-gaap_InventoryWriteDown 57,000us-gaap_InventoryWriteDown
Depreciation and amortization 349,000us-gaap_DepreciationAndAmortization 221,000us-gaap_DepreciationAndAmortization 377,000us-gaap_DepreciationAndAmortization
Amortization of stock-based compensation 477,000us-gaap_OtherAmortizationOfDeferredCharges 686,000us-gaap_OtherAmortizationOfDeferredCharges 674,000us-gaap_OtherAmortizationOfDeferredCharges
Loss on retirement of machinery and equipment 14,000us-gaap_GainLossOnDispositionOfAssets1 8,000us-gaap_GainLossOnDispositionOfAssets1  
Realized loss on marketable securities 203,000us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments    
Change in assets and liabilities:      
Trade accounts receivable 750,000us-gaap_IncreaseDecreaseInAccountsReceivable 83,000us-gaap_IncreaseDecreaseInAccountsReceivable 221,000us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories 124,000us-gaap_IncreaseDecreaseInInventories (1,233,000)us-gaap_IncreaseDecreaseInInventories (720,000)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets 467,000us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (677,000)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 66,000us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Other assets (65,000)us-gaap_IncreaseDecreaseInOtherOperatingAssets 174,000us-gaap_IncreaseDecreaseInOtherOperatingAssets (77,000)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable, deferred revenue and accrued liabilities (644,000)inph_IncreaseDecreaseInAccountsPayableDeferredRevenueAndAccruedLiabilities 1,294,000inph_IncreaseDecreaseInAccountsPayableDeferredRevenueAndAccruedLiabilities (120,000)inph_IncreaseDecreaseInAccountsPayableDeferredRevenueAndAccruedLiabilities
Accrued compensation (128,000)us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities 10,000us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities (172,000)us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities
Deferred lease obligations 1,199,000inph_IncreaseDecreaseInDeferredLeaseObligations (87,000)inph_IncreaseDecreaseInDeferredLeaseObligations (77,000)inph_IncreaseDecreaseInDeferredLeaseObligations
Net cash used in operating activities (1,337,000)us-gaap_NetCashProvidedByUsedInOperatingActivities (2,085,000)us-gaap_NetCashProvidedByUsedInOperatingActivities (3,560,000)us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:      
Purchase of property and equipment (1,536,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (120,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (165,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchase of capitalized software (10,000)us-gaap_PaymentsForSoftware (14,000)us-gaap_PaymentsForSoftware (127,000)us-gaap_PaymentsForSoftware
Proceeds from the sale of marketable securities 15,759,000us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities 14,670,000us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities 10,248,000us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
Purchases of marketable securities (14,210,000)us-gaap_PaymentsToAcquireMarketableSecurities (14,938,000)us-gaap_PaymentsToAcquireMarketableSecurities (10,746,000)us-gaap_PaymentsToAcquireMarketableSecurities
Net cash provided by (used in) investing activities 3,000us-gaap_NetCashProvidedByUsedInInvestingActivities (402,000)us-gaap_NetCashProvidedByUsedInInvestingActivities (790,000)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:      
Borrowings under credit facility 14,000,000us-gaap_ProceedsFromLongTermLinesOfCredit 14,000,000us-gaap_ProceedsFromLongTermLinesOfCredit 14,000,000us-gaap_ProceedsFromLongTermLinesOfCredit
Payments on credit facility (14,000,000)us-gaap_RepaymentsOfLinesOfCredit (14,000,000)us-gaap_RepaymentsOfLinesOfCredit (14,000,000)us-gaap_RepaymentsOfLinesOfCredit
Proceeds from the issuance of common stock 3,349,000us-gaap_ProceedsFromIssuanceOfPrivatePlacement    
Proceeds from the exercise of stock options 27,000us-gaap_ProceedsFromStockOptionsExercised 26,000us-gaap_ProceedsFromStockOptionsExercised 835,000us-gaap_ProceedsFromStockOptionsExercised
Net cash provided by financing activities 3,376,000us-gaap_NetCashProvidedByUsedInFinancingActivities 26,000us-gaap_NetCashProvidedByUsedInFinancingActivities 835,000us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash and cash equivalents (3,000)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (10,000)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (6,000)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net increase (decrease) in cash and cash equivalents 2,039,000us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (2,471,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (3,521,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year 1,478,000us-gaap_CashAndCashEquivalentsAtCarryingValue 3,949,000us-gaap_CashAndCashEquivalentsAtCarryingValue 7,470,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year 3,517,000us-gaap_CashAndCashEquivalentsAtCarryingValue 1,478,000us-gaap_CashAndCashEquivalentsAtCarryingValue 3,949,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Income taxes paid 19,000us-gaap_IncomeTaxesPaid 12,000us-gaap_IncomeTaxesPaid 10,000us-gaap_IncomeTaxesPaid
Interest paid $ 6,000us-gaap_InterestPaid $ 7,000us-gaap_InterestPaid $ 7,000us-gaap_InterestPaid