Corporate Bonds And Notes [Member] Major Types of Debt and Equity Securities [Axis] Municipal Bonds [Member] Trade Names [Member] Finite-Lived Intangible Assets by Major Class [Axis] Minimum [Member] Range [Axis] Patents and Technological Know-how [Member] Proprietary Software [Member] Other Intangible Assets [Member] Maximum [Member] Fair Value, Inputs, Level 1 [Member] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Recurring [Member] Measurement Frequency [Axis] Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 2 [Member] Cost of Goods Sold [Member] Income Statement Location [Axis] Sales and Marketing [Member] Research and Product Development [Member] General and Administrative [Member] 1998 Incentive Plan [Member] Plan Name [Axis] 2007 Equity Incentive Plan [Member] Employees [Member] Title of Individual [Axis] 1998 Incentive Plan and 2007 Equity Incentive Plan [Member] 2014 Employee Stock Purchase Plan [Member] Directors And Officers [Member] Other Employees [Member] Subsequent Event [Member] Subsequent Event Type [Axis] Document And Entity Information Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Current Fiscal Year End Date Entity Filer Category Entity Common Stock, Shares Outstanding Trading Symbol Document Fiscal Period Focus Document Fiscal Year Focus Statement of Financial Position [Abstract] ASSETS Current assets: Cash and cash equivalents Marketable securities Receivables, net of allowance for doubtful accounts of $86 and $54, respectively Inventories Distributor channel inventories Prepaid expenses and other assets Total current assets Long-term marketable securities Long-term inventories, net Property and equipment, net Intangibles, net Goodwill Deferred income taxes Other assets Total assets LIABILITIES AND SHAREHOLDERS' EQUITY Current liabilities: Accounts payable Accrued liabilities Deferred product revenue Total current liabilities Deferred rent Other long-term liabilities Total liabilities Shareholders' equity: Common stock, par value $0.001, 50,000,000 shares authorized, 8,933,582 and 9,183,957 shares issued and outstanding Additional paid-in capital Accumulated other comprehensive income (loss) Retained earnings Total shareholders' equity Total liabilities and shareholders' equity Allowance for doubtful accounts Common stock par value Common stock shares authorized Common stock shares issued Common stock shares outstanding Income Statement [Abstract] Revenue Cost of goods sold Gross profit Operating expenses: Sales and marketing Research and product development General and administrative Total operating expenses Operating income Other income, net Income before income taxes Provision for income taxes Net income Basic earnings per common share Diluted earnings per common share Basic weighted average shares outstanding Diluted weighted average shares outstanding Comprehensive income: Net income Other comprehensive income: Change in unrealized gains (losses) on available-for-sale securities, net of tax Change in foreign currency translation adjustment Comprehensive income Statement of Cash Flows [Abstract] Cash flows from operating activities: Net income Adjustments to reconcile net income to net cash provided by operations: Depreciation and amortization expense Amortization of deferred rent Stock-based compensation expense Provision for (recoveries of) doubtful accounts, net Write-down of inventory to net realizable value Loss on disposal of assets Tax benefit from exercise of stock options Deferred income taxes Changes in operating assets and liabilities: Receivables Inventories Prepaid expenses and other assets Accounts payable Accrued liabilities Income taxes payable Deferred product revenue Other long-term liabilities Net cash provided by operating activities Cash flows from investing activities: Purchase of property and equipment Proceeds from maturities and sales of marketable securities Purchases of marketable securities Net cash provided by (used in) investing activities Cash flows from financing activities: Proceeds from the exercise of stock options Repurchase and cancellation of stock options Tax benefits from exercise of stock options Dividends paid Repurchase and cancellation of stock Net cash used in financing activities Effect of exchange rate changes on cash and cash equivalents Net increase (decrease) in cash and cash equivalents Cash and cash equivalents at the beginning of the period Cash and cash equivalents at the end of the period Supplemental disclosure of cash flow information: Cash paid for income taxes Organization, Consolidation and Presentation of Financial Statements [Abstract] Business Description, Basis of Presentation and Significant Accounting Policies Earnings Per Share [Abstract] Earnings Per Share Investments, Debt and Equity Securities [Abstract] Marketable Securities Goodwill and Intangible Assets Disclosure [Abstract] Intangible Assets Inventory Disclosure [Abstract] Inventories Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Share-based Compensation Equity [Abstract] Shareholders' Equity Fair Value Disclosures [Abstract] Fair Value Measurements Income Tax Disclosure [Abstract] Income Taxes Subsequent Events [Abstract] Subsequent Events Business Description Basis of Presentation Significant Accounting Policies Recent Accounting Pronouncements Computation of Basic and Diluted Earnings Per Common Share Schedule of Available-for-sale Securities Reconciliation Schedule of Maturities of Marketable Securities Schedule of Available-for-sale Securities Schedule of Intangible Assets Schedule of Amortization of Intangible Assets Schedule of Estimated Future Amortization Expense of Intangible Assets Schedule of Inventory, Net of Reserves Summary of Losses Incurred on Valuation of Inventory Schedule of Stock Options Activity Schedule of Share-based Compensation Expense Summary of Change in Shareholders' Equity Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis Dilutive common stock equivalents using treasury stock method Weighted average options outstanding Anti-dilutive options not included in the computations Statement [Table] Statement [Line Items] Amortized cost Gross unrealized holding gains Gross unrealized holding losses Estimated fair value Amortized cost Due within one year Amortized cost Due after one year through five years Amortized cost Due after five years through ten years Amortized cost Total available-for-sale securities Estimated fair value Due within one year Estimated fair value Due after one year through five years Estimated fair value Due after five years through ten years Estimated fair value Total available-for-sale securities Less than 12 Months - Estimated Fair Value Less than 12 Months - Gross Unrealized Holding Losses More than 12 Months - Estimated Fair Value More than 12 Months - Gross Unrealized Holding Losses Total Estimated Fair Value Total Gross Unrealized Holding Losses Estimated useful lives Total intangible assets Accumulated amortization Total intangible assets, net Amortization of intangible assets 2016 (remainder) 2017 2018 2019 2020 Thereafter Finite-Lived Intangible Assets, Net Inventories Details Narrative Current finished goods do not include consigned inventory amount Inventories - Schedule Of Inventory Net Of Reserves Details Raw materials Finished goods Current Inventories Raw materials Finished goods Long-term Inventories Inventories - Summary Of Losses Incurred On Valuation Of Inventory Details Net loss on valuation of inventory and write-off of obsolete inventory Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Number of stock options granted Stock options vested period Stock options accelerated vesting shares Contractual life Maximum number of stock options grants Stock options vesting description Number of stock options shares outstanding Number of stock options shares authorized and unissued Unrecognized compensation cost related to non-vested stock options, net of forfeitures Recognized over weighted average period Stock options repurchased during the period Stock option average purchase price per share Number of shares available for offerings Percentage of shares excess of combined voting power of parents and subsidiary Number of stock options shares purchased under the plan during the period Number of stock options fair value purchased under the plan during the period Percentage of common stock purchase of period at price equal to fair market value Percentage of fair value of common stock discount Number of shares Options, Outstanding at beginning of period Number of shares Options, Granted Number of shares Options, Exercised Number of shares Options, Repurchased Number of shares Options, Canceled or Expired Number of shares Options, Outstanding at end of period Number of shares Options, Exercisable at end of period Weighted Average Exercise Price, Outstanding at beginning of period Weighted Average Exercise Price, Granted Weighted Average Exercise Price, Exercised Weighted Average Exercise Price, Repurchased Weighted Average Exercise Price, Forfeited or expired Weighted Average Exercise Price, Outstanding at end of period Weighted Average Exercise Price, Exercisable at end of period Share-based compensation expense Dividend price per share Shareholders Equity - Summary Of Change In Shareholders Equity Details Balance at the beginning of the period Exercise of stock options Stock repurchased Options repurchased Proceeds from stock purchase plan Dividends Share-based compensation - options Share-based compensation - ESPP Tax benefit - stock option exercises Unrealized gain or loss on investments, net of tax Foreign currency translation adjustment Net Income during the period Balance at end of the period Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Line Items] Investments, Fair Value Disclosure Effective tax rate, forecasted Effective income tax rate, continuing operations, forecasted increase (decrease) in rate Effective income tax rate Effective income tax rate forecasted excludes jurisdictions Effective tax rate, including loss jurisdictions Discrete tax benefit Effective tax rate, after discreet benefits Dividend price per share Dividend paid date Dividend record date Contractual life. Corporate Bonds And Notes [Member] Current Inventories Net of Reserves. Directors And Officers [Member] This tag represents the increase or decrease between the prior period effective income tax rate and the current period forecasted effective income tax rate. Effective income tax rate forecasted excludes jurisdictions. Effective Tax Rate, After Discreet Benefits The forecasted effective tax rate which includes loss jurisdiction for which no benefit from forecasted current year losses is anticipated. Employees [Member] Inventory, Noncurrent, Finished Goods, Net of Reserves. Inventory, Noncurrent, Raw Materials, Net of Reserves. Net loss on valuation of inventory and write-off of obsolete inventory. 1998 Incentive Plan and 2007 Equity Incentive Plan [Member] 1998 Incentive Plan [Member] Other Employees [Member] Patents and Technological Know-how [Member] Payments for repurchase of stock options. Percentage of shares excess of combined voting power of parents and subsidiary. Proprietary Software [Member] Schedule of inventory current and noncurrent [Table text block]. Share based Compensation Arrangement by Share based Payment Award, Number of Shares Authorized and Unissued Share Based Compensation Arrangement By Share Based Payment Award Options Repurchased In Period. Share Based Compensation Arrangements By Share Based Payment Award Options Repurchases In Period Weighted Average Exercise Price. Stock Options Repurchased During Period, Value - the value paid for the repurchase of unexercised stock options Summary Of Losses Incurred On Valuation Of Inventory [Table Text Block] 2014 Employee Stock Purchase Plan [Member] 2007 Equity Incentive Plan [Member] Weighted average options outstanding. Significant Accounting Policies [Policy Text Block]. Assets, Current Assets Liabilities, Current Liabilities Stockholders' Equity Attributable to Parent Liabilities and Equity Gross Profit Operating Expenses Operating Income (Loss) Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Comprehensive Income (Loss), Net of Tax, Attributable to Parent Gain (Loss) on Disposition of Assets Excess Tax Benefit from Share-based Compensation, Operating Activities Increase (Decrease) in Deferred Income Taxes Increase (Decrease) in Receivables Increase (Decrease) in Inventories Increase (Decrease) in Prepaid Expense and Other Assets Increase (Decrease) in Accounts Payable Increase (Decrease) in Accrued Liabilities Increase (Decrease) in Deferred Revenue Increase (Decrease) in Other Noncurrent Liabilities Net Cash Provided by (Used in) Operating Activities Payments to Acquire Property, Plant, and Equipment Payments to Acquire Marketable Securities Net Cash Provided by (Used in) Investing Activities PaymentsForRepurchaseOfStockOptions Payments of Dividends Payments for Repurchase of Common Stock Net Cash Provided by (Used in) Financing Activities Cash and Cash Equivalents, Period Increase (Decrease) Inventory Disclosure [Text Block] Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Available-for-sale Debt Securities, Amortized Cost Basis Available-for-sale Securities, Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss CurrentInventoriesNetOfReserves InventoryNoncurrentRawMaterialsNetOfReserves InventoryNoncurrentFinishedGoodsNetOfReserves Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest StockOptionsRepurchasedDuringPeriodValue Dividends, Cash Dividends Payable, Amount Per Share