Document and Entity Information [Abstract] Document and Entity Information [Abstract] Document Type Amendment Flag Document Period End Date Document Fiscal Year Focus Document Fiscal Period Focus Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Entity Filer Category Entity Common Stock, Shares Outstanding Condensed Consolidated Balance Sheets [Abstract] Assets [Abstract] Assets Marketable Securities, Current Short-term marketable securities Restricted Cash and Cash Equivalents, Current Restricted cash Accounts Receivable, Net, Current Accounts receivable, net of allowances of $379 and $266 Prepaid Expense and Other Assets Prepaid expenses and other Assets, Current Total Current Assets Marketable Securities, Noncurrent Long-term marketable securities Property, Plant and Equipment, Net Fixed assets, net of accumulated depreciation of $24,147 and $21,757 Goodwill Balance, end of period Balance, beginning of period Goodwill Finite-Lived Intangible Assets, Net Total, Net Purchased intangible assets, net of accumulated amortization of $3,830 and $3,267 Other Assets, Noncurrent Other assets, net of accumulated amortization of $3,982 and $3,703 Liabilities and Equity [Abstract] Liabilities and Shareholders' Equity Accounts Payable, Current Accounts payable Accrued Liabilities Current Accrued liabilities Accrued Liabilities, Current, Total Liabilities, Current Total Current Liabilities Deferred Revenue, Noncurrent Deferred revenue Other Liabilities, Noncurrent Other long-term liabilities Liabilities Total Liabilities Stockholders' Equity Attributable to Parent [Abstract] Shareholders' Equity: Common Stock, Value, Issued Common stock, $0.01 par value. Authorized 100,000 shares; issued and outstanding: 14,195 and 14,165 Additional Paid in Capital, Common Stock Additional paid-in capital Retained Earnings (Accumulated Deficit) Accumulated deficit Liabilities and Stockholders' Equity Total Liabilities and Shareholders' Equity Allowance for Doubtful Accounts Receivable, Current Accounts receivable, allowances Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Fixed assets, accumulated depreciation Finite-Lived Intangible Assets, Accumulated Amortization Less accumulated amortization Purchased intangible assets, accumulated amortization Other Assets Accumulated Amortization Other assets, accumulated amortization Other Assets Accumulated Amortization Common Stock, Par or Stated Value Per Share Common stock, par value Common Stock, Shares Authorized Common stock, shares authorized Common Stock, Shares, Issued Common stock, shares issued Common Stock, Shares, Outstanding Common stock, shares outstanding Condensed Consolidated Statements of Operations [Abstract] Revenue Revenue Cost of Goods Sold Cost of sales Gross Profit Gross profit Gross profit Operating Expenses [Abstract] Operating expenses: Research and Development Expense Research and development Selling, General and Administrative Expense Selling, general and administrative Operating Expenses Total operating expenses Operating Income (Loss) Income (loss) from operations Income (loss) from operations Nonoperating Income (Expense) [Abstract] Other income (expense): Other Nonoperating Income (Expense) Other, net Nonoperating Income (Expense) Total other income (expense), net Loss before income taxes Income (loss) from continuing operations before income taxes Income tax expense (benefit) Income Tax Expense (Benefit) Net income (loss) Net income (loss) Net income (loss) Net income (loss) Weighted Average Number of Shares Outstanding, Basic Shares used to calculate basic net income (loss) per share Basic Weighted Average Number of Shares Outstanding, Diluted Shares used to calculate diluted net income (loss) per share Diluted Condensed Consolidated Statements of Comprehensive Income (Loss) [Abstract] Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Change in cumulative translation adjustment Condensed Consolidated Statements of Cash Flows [Abstract] Net Cash Provided by (Used in) Operating Activities [Abstract] Cash flows from operating activities: Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and Amortization within Discontinued Operations Depreciation and amortization within discontinued operations. Depreciation and amortization within discontinued operations Stock Based Compensation within Discontinued Operations Stock based compensation within discontinued operations. Stock-based compensation within discontinued operations Loss on disposal of long-lived assets Loss on write-down or disposal of long-lived assets (Increase) decrease, net of the effect of disposition, in: Increase (Decrease) in Operating Assets [Abstract] Accounts receivable, net Accounts receivable, net Inventories, net Inventories Increase Decrease In Prepaid Deferred Expense And Other Assets Prepaid expenses and other Increase (decrease), net of effect of disposition, in: Increase (Decrease) in Operating Liabilities [Abstract] Increase Decrease In Deferred Revenue Deferred revenue Increase (Decrease) in Other Accrued Liabilities Accrued and other long-term liabilities Net Cash Provided by (Used in) Operating Activities Net cash provided by (used in) operating activities Purchase of marketable securities Purchase of marketable securities Payments to Acquire Property, Plant, and Equipment Purchase of fixed assets Increase (Decrease) in Restricted Cash Decrease in restricted cash Decrease in restricted cash Net Cash Provided by (Used in) Investing Activities Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Cash flows from financing activities: Principal payments on capital lease obligations Principal payments on capital lease obligations Payments Related to Tax Withholding for Share-based Compensation Withholding taxes paid on net settlement of vested restricted stock units Payments for Repurchase of Common Stock Cash paid for repurchase of common stock Net Cash Provided by (Used in) Financing Activities Net cash used in financing activities Cash and Cash Equivalents, Period Increase (Decrease) Increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) [Abstract] Cash and cash equivalents: Supplemental Cash Flow Information [Abstract] Supplemental disclosure of cash flow information: Cash paid (refunds received) for income taxes, net Cash paid (refunds received) for income taxes, net Organization Consolidation And Presentation Of Financial Statements Disclosure Text Block Inventories [Abstract] Inventory Disclosure Text Block Inventories Product Warranty [Abstract] Product Warranty Disclosure Text Block Product Warranty Goodwill And Intangible Assets Disclosure Text Block Goodwill and Purchased Intangible Assets Accrued Liabilities [Abstract] Accounts Payable and Accrued Liabilities Disclosure [Text Block] Accrued Liabilities Disclosure Of Compensation Related Costs Share Based Payments Text Block Stock-Based Compensation and Stock-Based Plans Stock Repurchase Plan [Abstract] Treasury Stock [Text Block] Stock Repurchase Plan Segment Reporting [Abstract] Segment Reporting Disclosure Text Block Segment Reporting Fair Value Measurements [Abstract] Fair Value Disclosures Text Block Fair Value Measurements Restructuring And Related Activities Disclosure Text Block Restructuring Recent Accounting Guidance [Abstract] Schedule Of New Accounting Pronouncements And Changes In Accounting Principles Text Block Recent Accounting Guidance Schedule of inventories Schedule of Inventory, Current [Table Text Block] Inventory, Raw Materials, Gross Raw materials Inventory, Work in Process, Gross Work-in-process Inventory, Finished Goods, Gross Finished goods Inventory, Gross Inventories Inventories (Textual) [Abstract] Inventories. Inventories (Textual) [Abstract] Schedule of inventories Inventory, Finished Goods and Work in Process, Gross [Abstract] Inventory Write-down Inventory charges Range [Axis] Range [Domain] Minimum [Member] Maximum [Member] Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Line Items] Inventories (Additional Textual) [Abstract] Inventories. Inventories (Additional Textual) [Abstract] Inventory Sold Period Inventory sold period Inventory sold period. Summary of shares used in calculating basic net income (loss) per share and diluted net income (loss) per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Securities not considered as they would have been antidilutive Summary of product warranty activity Summary of product warranty activity Product Warranty Accrual Warranty accrual, end of period Warranty accrual, beginning of period Product Warranty Accrual, Preexisting, Increase (Decrease) Reductions for warranty charges Goodwill and Purchased Intangible Assets (Textual) [Abstract] Goodwill and Purchased Intangible Assets (Textual) [Abstract] Goodwill and purchased intangible assets. Schedule of Goodwill [Table Text Block] Changes in goodwill Goodwill [Roll Forward] Changes in goodwill Purchased intangible assets Finite-Lived Intangible Assets, Gross [Abstract] Finite-Lived Customer Relationships, Gross Customer relationships Other Finite-Lived Intangible Assets, Gross Other Finite-Lived Intangible Assets, Gross Total, Gross Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Estimated amortization of purchased intangible assets Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Estimated amortization of purchased intangible assets Finite-Lived Intangible Assets, Amortization Expense, Year Two 2013 Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year Remainder of 2012 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2014 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2015 Finite-Lived Intangible Assets, Amortization Expense, Year Five 2016 Finite-Lived Intangible Assets, Amortization Expense, after Year Five Thereafter Accrual for Taxes Other than Income Taxes, Current Accrued sales taxes and VAT Accrued Income Taxes, Current Accrued income taxes Product Warranty Accrual, Current Accrued warranty Accrued Employee Benefits, Current Accrued compensation and benefits Other Accrued Liabilities, Current Other Accrued Sales Commission, Current Accrued commissions Accrued Restructuring Costs Current Accrued restructuring costs Accrued restructuring costs current. Schedule of Accrued Liabilities [Table Text Block] Summary of accrued liabilities Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] Summary of Stock-based compensation Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Summary stock option activity Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Summary of RSU activity Stock Based Compensation [Abstract] Summary of Stock-based compensation Stock- based compensation. Allocated Share-based Compensation Expense Stock- based compensation Research and Development Expense [Member] Research and development [Member] Selling, General and Administrative Expenses [Member] Selling, general and administrative [Member] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Summary stock option activity Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Weighted Average Exercise Price Ending Weighted Average Exercise Price Beginning Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Exercised Options Outstanding Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Granted, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Forfeited, Options Outstanding Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Forfeited, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Granted, Options Outstanding Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Exercised, Weighted Average Exercise Price Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis] Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain] Cost of Sales [Member] Cost of sales [Member] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]