Consolidated Balance Sheets [Abstract] ASSETS Assets [Abstract] Cash and cash equivalents Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Cash and cash equivalents Marketable securities Marketable securities Accounts receivable, net of allowance for doubtful accounts of $627 in 2012 and $245 in 2011 Accounts receivable, net of allowance for doubtful accounts of $227 in 2012 and $245 in 2011 Inventories Total inventory Inventory Net Deferred tax assets, net Deferred Tax Assets Net Current Prepaid expenses and other Prepaid Expense and Other Assets, Current Total current assets Total current assets Property and equipment, net of accumulated depreciation of $59,702 in 2012 and $59,217 in 2011 Property and equipment, Net Property and equipment, net of accumulated depreciation of $65,183 in 2012 and $59,217 in 2011 Marketable securities Marketable Securities Noncurrent Intangible assets, net of accumulated amortization of $11,951 in 2012 and $10,899 in 2011 Intangible assets, net of accumulated amortization of $11,951 in 2012 and $10,899 in 2011 Goodwill Goodwill at January 1 Goodwill at end of period Goodwill Deferred tax assets, net Deferred tax assets, net Other assets Other assets Assets by Geographic Concentration, Total Total assets Identifiable assets Total assets LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities And Stockholders Equity [Abstract] Accounts payable Accounts payable Accrued expenses Accrued expenses, Total Accrued expenses Total current liabilities Total current liabilities Other long-term liabilities Other long-term liabilities Total liabilities Total liabilities Stockholders' equity: Stockholders Equity [Abstract] Preferred stock, par value $0.001; 2,000 shares authorized and none outstanding Preferred stock, par value $0.001; 2,000 shares authorized and none outstanding Common stock, par value $0.001; 50,000 shares authorized, 33,655 and 32,262 shares issued and outstanding at December 31, 2012 and 2011, respectively Common stock, par value $0.001; 50,000 shares authorized, 33,655 and 32,262 shares issued and outstanding at December 31, 2012 and 2011, respectively Additional paid-in capital Additional paid-in capital Accumulated other comprehensive income (loss) Accumulated other comprehensive income Accumulated deficit Accumulated deficit Treasury stock at cost; 2,436 common shares at December 31, 2012 and 2011 Treasury stock at cost; 2,436 common shares at December 31, 2012 and 2011 Total stockholders' equity Beginning Balance Ending Balance Total stockholders' equity Total liabilities and stockholders' equity Total liabilities and stockholders' equity Accounts receivable, net of allowance for doubtful accounts Accounts receivable, allowance for doubtful accounts Property and equipment, net of accumulated depreciation Less- accumulated depreciation and amortization Property and equipment, accumulated depreciation Intangible Assets Accumulated Amortization Accumulated Amortization Intangible assets, accumulated amortization Preferred stock, par value Preferred stock, par value Preferred stock, shares authorized Preferred stock, shares authorized Preferred stock, shares outstanding Preferred stock, shares outstanding Common stock, shares authorized Common stock, shares authorized Common stock, shares issued Common stock, shares issued Common stock, shares outstanding Common stock, shares outstanding Treasury stock, shares Treasury stock, shares Intangible Assets [Abstract] Current assets: Assets, Current [Abstract] Current liabilities: Liabilities, Current [Abstract] Document and Entity Information [Abstract] Document and entity information. Supplemental Disclosures of Non Cash Financing Activities [Abstract] Supplemental disclosures of non-cash financing activities: Supplemental disclosures of non-cash financing activities. Goodwill [Abstract] Goodwill. Document Type Amendment Flag Document Period End Date Document Fiscal Period Focus Document Fiscal Year Focus Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Entity Filer Category Entity Common Stock, Shares Outstanding Stockholders' equity before treasury stock Stockholders' Equity before Treasury Stock Consolidated Statements of Operations [Abstract] Net revenues Net revenues Revenues Cost of net revenues Cost of Revenue Gross profit Gross profit Gross Profit Operating costs and expenses: Operating Costs and Expenses [Abstract] Research and development Research and Development Expense Sales and marketing Selling and Marketing Expense General and administrative General and Administrative Expense Goodwill impairment Goodwill, Impairment Loss Amortization of purchased intangible assets Amortization of purchased intangible assets Amortization of Acquired Intangible Assets Total operating costs and expenses Operating Expenses Operating loss Operating loss Operating Income (Loss) Other income (expense): Other Nonoperating Income (Expense) [Abstract] Other income (expense), net Other Nonoperating Income (Expense) Loss before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest To income Provision (benefit) for income taxes Income tax provision (benefit) Income Tax Expense (Benefit) Net loss Net loss Net loss applicable to common stockholders Net Income (Loss) Attributable to Parent Per share data: Earnings Per Share, Basic [Abstract] Weighted average shares used in computation of basic and diluted net loss per share: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Total comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Consolidated Statements of Cash Flows [Abstract] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net 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 Depreciation, Depletion and Amortization, Nonproduction Provision for bad debts Provision for Doubtful Accounts Inventory provision Inventory Write-down Share-based compensation expense Share-based Compensation Non-cash income tax expense (benefit) Total Deferred Deferred income tax expense related to the changes in the valuation allowances on deferred tax assets Deferred Income Tax Expense (Benefit) Changes in assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Inventories Increase (Decrease) in Inventories Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Accounts payable Increase (Decrease) in Accounts Payable Net cash provided by (used in) operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Purchases of property and equipment Payments to Acquire Property Plant and Equipment Purchases of marketable securities Payments To Acquire Marketable Securities Marketable securities maturities/sales Proceeds from Sale and Maturity of Marketable Securities Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities: Net Cash Provided By Used In Financing Activities [Abstract] Proceeds from stock option exercises and ESPP net of taxes paid on vested restricted stock units Proceeds from Stock Options Exercised Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Effect of exchange rates on cash and cash equivalents Effect of Exchange Rate on Cash and Cash Equivalents Net increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Supplemental disclosures of cash flow information: Supplemental Cash Flow Information [Abstract] Interest Interest Paid, Net Income taxes Income Taxes Paid, Net Financial Statement Details [Abstract] Financial Statement Details Condensed Financial Information of Parent Company Only Disclosure [Text Block] Intangible Assets Intangible Assets Disclosure [Text Block] Goodwill Goodwill Disclosure [Text Block] Fair Value Measurement of Assets and Liabilities [Abstract] Fair Value Measurement of Assets and Liabilities Fair Value, Measurement Inputs, Disclosure [Table Text Block] Stock Incentive and Employee Stock Purchase Plans [Abstract] Stock Incentive and Employee Stock Purchase Plans Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Segment Information and Concentrations of Risk [Abstract] Segment Information and Concentrations of Risk Segment Reporting Disclosure [Text Block] Earnings Per Share [Abstract] Earnings Per Share Earnings Per Share [Text Block] Commitments and Contingencies [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Income Taxes [Abstract] Income Taxes Income Tax Disclosure [Text Block] Net impairment loss on marketable securities Marketable Securities, Gain (Loss), Excluding Other than Temporary Impairments Purchases of intangible assets Payments To Acquire Intangible Assets Principles of Consolidation Consolidation, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Comprehensive Income (Loss) Comprehensive Income, Policy [Policy Text Block] Marketable securities available-for-sale Marketable Securities [Abstract] Corporate Debentures Bonds [Member] Corporate debentures / bonds [Member] Corporate debentures bonds. Marketable Equity Securities [Member] Marketable equity securities [Member] Marketable equity securities. Available-for-sale: Available-for-sale Securities [Abstract] Marketable Securities Maturity in Years Maturity in Years Marketable securities maturity in years. Gross Unrealized Gains Available-for-sale Securities, Gross Unrealized Gains Gross Unrealized Losses Available-for-sale Securities, Gross Unrealized Losses Government agency securities [Member] US Government Agencies Debt Securities [Member] Municipal bonds [Member] Municipal Bonds [Member] Certificates of deposit [Member] Certificates of Deposit [Member] Schedule of Trading Securities and Other Trading Assets [Table] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Investment Type [Axis] Investment Type Categorization [Domain] Schedule of Trading Securities and Other Trading Assets [Line Items] Summary of Marketable Securities Marketable Securities [Table Text Block] Summary of inventories Schedule of Inventory, Current [Table Text Block] Inventories Inventory, Net [Abstract] Finished goods Inventory, Finished Goods, Gross Raw materials and components Inventory, Raw Materials, Gross Principal payments under capital lease obligations Repayments of Debt and Capital Lease Obligations Schedule of amortization expense of purchased intangible assets expected to be recognized Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Schedule of amortizable purchased intangible assets from acquisition Schedule of Finite-Lived Intangible Assets [Table Text Block] Developed technologies [Member] Developed Technology Rights [Member] Other [Member] Other Intangible Assets [Member] Impairment of Intangible Assets, Finite-lived Impairment loss on equipment and software license intangible assets Impairment/Impairment charges against intangible assets Impairment loss on equipment and software license intangible assets Purchased intangible assets from acquisition Impairment of Intangible Assets (Excluding Goodwill) [Abstract] Amortizable purchased intangible assets currently estimated to be expensed Goodwill and Intangible Assets Disclosure [Abstract] Schedule Of Finite Lived Intangible Assets [Table] Finite Lived Intangible Assets By Major Class [Axis] Finite Lived Intangible Assets Major Class Name [Domain] Trade name [Member] Trade Names [Member] Finite Lived Intangible Assets [Line Items] 2014 Finite Lived Intangible Assets Amortization Expense Year Two 2015 Finite Lived Intangible Assets Amortization Expense Year Three 2016 Finite Lived Intangible Assets Amortization Expense Year Four Purchased Intangible Assets Net Net Finite Lived Intangible Assets Net Intangible Assets (Textual) [Abstract] Intangible Assets (Textual) [Abstract] Intangible Assets. Schedule of carrying amount of goodwill changes Schedule of Goodwill [Table Text Block] Changes in carrying amount of goodwill Goodwill Roll Forward [Abstract] M2M Products and Solutions [Member] Trade Secrets [Member] Goodwill (Textual) [Abstract] Goodwill (Textual) [Abstract] Goodwill. Schedule of Accrued Expenses Table Text Block Summary of accrued Expenses Accrued expenses. Market Development Fund and Price Protection Market development funds and price protection Market development fund and price protection. Payroll and Related Expenses Payroll and related expenses Payroll and related expenses. Accrued Expenses Accrued Liabilities, Current [Abstract] Royalties Accrued Royalties, Current Deferred rent Deferred Rent Credit, Current Other Other Accrued Liabilities, Current Professional fees Accrued Professional Fees, Current Accrued warranty obligations Product Warranties Disclosures [Abstract] Marketable Equity Securities Received In Settlement Of Note Receivable Marketable equity securities received in settlement of note receivable Marketable equity securities received in settlement of note receivable. Summary of Company's financial instrument, fair value on a recurring basis Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Fair value on a recurring basis Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] Assets: Assets, Fair Value Disclosure [Abstract] Cash equivalents Cash and Cash Equivalents, at Carrying Value [Abstract] Total cash equivalents Cash Equivalents, at Carrying Value Total short-term marketable securities Short-term Investments Total long-term marketable securities Long-term Investments Total financial assets Assets, Fair Value Disclosure Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring [Member] Fair Value, Measurements, Recurring [Member] Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Asset Class [Axis]