Condensed Consolidated Balance Sheets [Abstract] Cash and cash equivalents Cash and cash equivalents, end of period Cash and cash equivalents, beginning of period Cash and cash equivalents Marketable securities Marketable securities Accounts receivable, net of allowance for doubtful accounts of $228 at September 30, 2010 and $741 at December 31, 2009 Accounts receivable, net of allowance for doubtful accounts of $297 at June 30, 2012 and $245 at December 31, 2011 Inventory Net Total inventory Inventories Deferred Tax Assets Net Current Deferred tax assets, net Prepaid Expense and Other Assets, Current Prepaid expenses and other Total current assets Total current assets Property and equipment, net of accumulated depreciation of $63,786 at June 30, 2012 and $59,217 at December 31, 2011 Property and equipment, net of accumulated depreciation of $47,449 at September 30, 2010 and $40,279 at December 31, 2009 Marketable Securities Noncurrent Marketable securities Intangible assets, net of accumulated amortization of $11,072 at June 30, 2012 and $10,899 at December 31, 2011 Intangible assets, net of accumulated amortization of $3,058 at September 30, 2010 and $2,441 at December 31, 2009 Balance at June 30 Goodwill Balance at January 1 Goodwill Deferred tax assets, net Deferred tax assets, net Other assets Other assets Total assets Total assets 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 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, 32,950 and 32,262 shares issued and outstanding at June 30, 2012 and December 31, 2011, respectively Common stock, par value $0.001; 50,000 shares authorized, 31,620 and 31,092 shares issued and outstanding at September 30, 2010 and December 31, 2009, respectively Additional paid-in capital Additional paid-in capital Accumulated other comprehensive income (loss) Accumulated other comprehensive income Accumulated deficit Accumulated deficit Treasury Stock Value Treasury stock at cost; 2,436 common shares at June 30, 2012 and December 31, 2011, respectively Total stockholders' equity Total stockholders' equity Total liabilities and stockholders' equity Total liabilities and stockholders' equity Accounts receivable, allowance for doubtful accounts Accounts receivable, net of allowance for doubtful accounts Property and equipment, accumulated depreciation Property and equipment, net of accumulated depreciation Intangible assets, accumulated amortization Accumulated Amortization Intangible assets, net of accumulated amortization Preferred stock, par value Preferred stock, par value Common stock, shares authorized Common stock, shares authorized Intangible Assets [Abstract] Assets, Current [Abstract] Current assets: Liabilities, Current [Abstract] Current liabilities: 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. 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provision Net Income (Loss) Attributable to Parent Net loss Net loss Earnings Per Share, Basic [Abstract] Per share data: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted average shares used in computation of basic and diluted net loss per share: Weighted Average Number of Shares Outstanding, Basic Basic Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive loss Comprehensive loss Statement of Cash Flows [Abstract] Net Cash Provided by (Used in) Operating Activities [Abstract] Cash flows from operating activities: Adjustments to reconcile net loss to net cash used in operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Increase (Decrease) in Operating Capital [Abstract] Changes in assets and liabilities: Increase (Decrease) in Accounts Receivable Accounts receivable Increase (Decrease) in Inventories Inventories Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other assets Net cash used in operating activities Net Cash Provided by (Used in) Operating Activities Net Cash Provided by (Used in) Investing Activities [Abstract] Cash flows from investing activities: Payments to Acquire Property Plant and Equipment Purchases of property and equipment Payments To Acquire Marketable Securities Purchases of 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 Net Cash Provided By Used In Financing Activities [Abstract] Cash flows from financing activities: 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 Rate on Cash and Cash Equivalents Effect of exchange rates on cash and cash equivalents Supplemental Cash Flow Information [Abstract] Supplemental disclosures of cash flow information: Interest Paid, Net Interest Basis of Presentation [Abstract] Balance Sheet Details [Abstract] Condensed Financial Information of Parent Company Only Disclosure [Text Block] Balance Sheet Details Intangible Assets Disclosure [Text Block] Intangible Assets Goodwill Disclosure [Text Block] Goodwill Fair Value Measurement of Assets and Liabilities [Abstract] Fair Value, Measurement Inputs, Disclosure [Table Text Block] Fair Value Measurement of Assets and Liabilities Share-Based Compensation [Abstract] Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Share-Based Compensation Segment Information and Concentrations of Risk [Abstract] Segment Reporting Disclosure [Text Block] Segment Information and Concentrations of Risk Earnings Per Share [Abstract] Earnings Per Share [Text Block] Earnings Per Share Commitments and Contingencies [Abstract] Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Comprehensive Loss [Abstract] Comprehensive Income (Loss) Note [Text Block] Comprehensive Loss Income Taxes [Abstract] Income Tax Disclosure [Text Block] Income Taxes Revenues Net revenues Research and Development Expense Research and development Selling and Marketing Expense Sales and marketing Other Nonoperating Income (Expense) Income Tax Expense (Benefit) Earnings Per Share, Basic Basic Earnings Per Share, Diluted Diluted Weighted Average Number of Shares Outstanding, Diluted Diluted Depreciation, Depletion and Amortization, Nonproduction Depreciation and amortization Provision for Doubtful Accounts Provision for bad debts Inventory Write-down Inventory provision Share-based Compensation Share-based compensation expense Deferred Income Tax Expense (Benefit) Non-cash income tax expense (benefit) Increase (Decrease) in Accounts Payable Accounts payable Marketable Securities, Gain (Loss), Excluding Other than Temporary Impairments Net impairment loss on marketable securities Payments To Acquire Intangible Assets Purchases of intangible assets Purchased intangible asset Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Basis of Presentation Basis of Presentation (Textual) [Abstract] Basis of Presentation. Basis of Presentation (Textual) [Abstract] Goodwill Impairment Test Goodwill impairment test. Goodwill impairment test Consolidation, Policy [Policy Text Block] Principles of Consolidation Use of Estimates, Policy [Policy Text Block] Use of Estimates New Accounting Pronouncements, Policy [Policy Text Block] New Accounting Pronouncements Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Intangibles-Goodwill and Other Goodwill and Intangible Assets, Policy [Policy Text Block] Testing Goodwill for Impairment Comprehensive Income, Policy [Policy Text Block] Comprehensive Income Basis of Presentation and Significant Accounting Policies [Text Block] Presentation of Comprehensive Income Marketable Securities [Abstract] Marketable securities available-for-sale 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 Securities [Abstract] Available-for-sale: Marketable Securities Maturity in Years Maturity in Years Marketable securities maturity in years. Available-for-sale Securities, Gross Unrealized Gains Gross Unrealized Gains Available-for-sale Securities, Gross Unrealized Losses Gross Unrealized Losses US Government Agencies Debt Securities [Member] Government agency securities [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 available-for-sale Marketable Securities [Table Text Block] Summary of inventories Inventory, Net [Abstract] Inventories Inventory, Finished Goods, Gross Finished goods Inventory, Raw Materials, Gross Raw materials and components Repayments of Debt and Capital Lease Obligations Principal payments under 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 Technology Rights [Member] Developed technologies [Member] Other Intangible Assets [Member] Other [Member] Impairment of Intangible Assets, Finite-lived Impairment Impairment of Intangible Assets (Excluding Goodwill) [Abstract] Purchased intangible assets from acquisition Goodwill and Intangible Assets Disclosure [Abstract] Amortizable purchased intangible assets currently estimated to be expensed Schedule Of Finite Lived Intangible Assets [Table] Finite Lived Intangible Assets By Major Class [Axis] Finite Lived Intangible Assets Major Class Name [Domain] Trade Names [Member] Trade name [Member] Finite Lived Intangible Assets [Line Items] Finite Lived Intangible Assets Amortization Expense Year Two 2013 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 Intangible Assets (Textual) [Abstract] Intangible Assets. Intangible Assets (Textual) [Abstract] Finite Lived Intangible Assets Amortization Expense After Year Six Thereafter Finite lived intangible assets amortization expense after year six. Finite Lived Intangible Assets Amortization Expense Year Six 2017 Finite lived intangible assets amortization expense year six. Intangible Assets Included Operating Costs And Expenses Table Text Block Summary of amortization expenses of purchased intangible assets Intangible assets included operating costs and expenses. Schedule Of Indefinite Lived Intangible Assets [Table] Schedule of carrying amount of goodwill changes Goodwill Roll Forward [Abstract] Changes in carrying amount of goodwill Trade Secrets [Member] M2M Products and Solutions [Member] Goodwill (Textual) [Abstract] Goodwill. Goodwill (Textual) [Abstract] Impairments Analyses Impairments analyses. Impairments analyses Indefinite-lived Intangible Assets by Major Class [Axis] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets [Line Items] Goodwill, Impaired, Adjustment to Initial Estimate Amount Pre-tax goodwill impairment Income Taxes Paid, Net Income taxes Schedule of Accrued Expenses Table Text Block Summary of accrued Expenses Accrued expenses. Accrued Warranty Obligations Table Text Block Summary of accrued warranty obligations Accrued Warranty Obligations. Market Development Fund and Price Protection Market development fund and price protection Market development fund and price protection. Payroll and Related Expenses Payroll and related expenses. Payroll and related expenses Accrued Liabilities, Current [Abstract] Accrued Expenses Accrued Royalties, Current Royalties Product Warranty Accrual, Current Warranty liability at end of period Deferred Rent Credit, Current Deferred rent Other Accrued Liabilities, Current Other Accrued Professional Fees, Current Professional fees Product Warranties Disclosures [Abstract] Accrued Warranty Obligations Net Unrealized Gain (Textual) [Abstract] Balance Sheet Details (Textual) [Abstract] Net unrealized gain. Net Unrealized Gain Net unrealized gain Net unrealized gain 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, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] Fair value on a recurring basis Assets, Fair Value Disclosure [Abstract] Assets: Cash and Cash Equivalents, at Carrying Value [Abstract] Cash equivalents Cash Equivalents, at Carrying Value Total cash equivalents Short-term Investments Total short-term marketable securities Long-term Investments Total long-term marketable securities Assets, Fair Value Disclosure Total financial assets Fair Value Measurement of Assets And Liabilities (Textual) [Abstract] Fair value measurement of assets and liabilities. Fair Value Measurement of Assets and Liabilities (Textual) [Abstract] Long-term Debt, Maturities, Repayment Terms Long-term marketable debt securities maturities 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] Fair Value, Inputs, Level 1 [Member] Level 1 [Member] Fair Value, Inputs, Level 2 [Member] Level 2 [Member] Asset Class [Axis] Fair Value by Asset Class [Domain] Money Market Funds [Member] Money market funds [Member] US Treasury Securities [Member] US Treasury securities [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Payment Of Sharebased Compensation Awards [Abstract] Payment of share-based compensation awards Payment of share-based compensation awards. Cost of Sales [Member] Cost of net revenues [Member] Research and Development Expense [Member] Research and development [Member] Selling and Marketing Expense [Member] Sales and marketing [Member] General and Administrative Expense [Member] General and administrative [Member] 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] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Schedule of net revenues, operating income (loss) and identifiable assets of segments Segment Reporting Information, Profit (Loss) [Abstract] Net revenues, operating income (loss) and identifiable assets for our reportable segments Mobile Computing Products [Member] Mobile Computing Products [Member] Mobile computing products. Sales Revenue, Goods, Net [Abstract] Net revenues by operating segment: Operating Income (Loss) [Abstract] Operating income (loss) : Segment Reporting Information, Revenue for Reportable Segment [Abstract] Identifiable assets by reportable segment: UNITED STATES [Member] United States [Member] CANADA [Member] Canada [Member] Europe Countries [Member] Europe / Middle East / Africa [Member] Europe [Member] Europe countries. Asia Countries [Member] Asia [Member] Asia countries. Asia/Australia [Member] Long-Lived Assets Assets by Geographic Concentration, Total Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] Schedule of geographic concentration of net revenues Net Revenues By Geographic Region [Abstract] Net revenues by geographic region Net revenues by geographic region. Schedule of Segment Reporting Information, by Segment [Table] Business Segments [Axis] Segment [Domain] Segment Reporting Information [Line Items] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Geographical [Axis] Segment, Geographical [Domain] Revenues from External Customers and Long-Lived Assets [Line Items] Segment Information And Concentrations Of Risk (Textual) [Abstract] Segment Information and Concentrations of Risk (Textual) [Abstract] Segment information and concentrations of risk. Customer One [Member] Customer One [Member] Customer one. Customer Two [Member] Customer Two [Member] Customer two. Customer Three [Member] Customer Three [Member] Customer three. Earnings Per Share (Textual) [Abstract] Earnings Per Share (Textual) [Abstract] Earnings per share. Weighted Average Number of Shares Outstanding, Basic and Diluted Weighted-average common shares outstanding basic and diluted Unrealized Gain on Cash Equivalents And Marketable Securities Net Of Tax Unrealized gain (loss) on cash equivalents and marketable securities, net of tax Unrealized gain on cash equivalents and marketable securities net of tax Commitments and Contingencies (Textual) [Abstract] Commitments and contingencies. Commitments and Contingencies (Textual) [Abstract] Loss Contingency, Lawsuit Filing Date "Lawsuit" filed date Company [Member] Company. Company [Member] Commitments and Contingencies (Additional Textual) [Abstract] Commitments and contingencies. Commitments and Contingencies (Additional Textual) [Abstract] Loss Contingency, Settlement Agreement, Consideration Payment of fees and expenses to the plaintiffs' counsel September Fifteenth Two Thousand Eight [Member] September fifteenth two thousand eight. September Fifteenth Two Thousand Eight [Member] September Eighteenth Two Thousand Eight [Member] September Eighteenth Two Thousand Eight [Member] September eighteenth two thousand eight. Schedule of comprehensive loss Loss Contingencies [Table] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Insurance-related Assessments [Member] Insurance proceeds [Member] Litigation Case [Axis] Litigation Case Type [Domain] Loss Contingencies [Line Items] Income Taxes (Textual) [Abstract] Income Taxes. Income Taxes (Textual) [Abstract] Review Of Taxable Income Number of sources for taxable income Review of the four sources of taxable income. Valuation Allowance, Amount Valuation allowance Income Tax Expense (Benefit), Extraordinary Items Income tax expense, including discrete items Unrecognized Tax Benefits, Period Increase (Decrease) Unrecognized Tax Benefits, Period Increase (Decrease), Total Total liability for unrecognized tax benefits included other long-term liabilities Unrecognized Tax Benefits, Interest on Income Taxes Accrued Expected unrecognized tax benefits due to expiration of limitations applicable to the 2007 taxable year Deferred Tax Assets, Net Net deferred tax assets Interest Expense related to uncertain tax positions Interest expense related to uncertain tax positions. Interest expense related to uncertain tax positions Liabilities And Stockholders Equity [Abstract] LIABILITIES AND STOCKHOLDERS' EQUITY Stockholders Equity [Abstract] Stockholders' equity: Payments To Acquire Software Acquired software licenses Assets [Abstract] ASSETS Stockholders' Equity before Treasury Stock Stockholders' equity before treasury stock Certificates of Deposit [Member] Certificates of deposit [Member] Assets By Geographic Region [Abstract] Assets By Geographic Concentration Assets by geographic region. Common Stock, Par or Stated Value Per Share Common stock, par value Short Term Marketable Securities [Member] Short-term marketable securities [Member] Short term marketable securities member. Long Term Marketable Securities [Member] Long-term marketable securities [Member] Long term marketable securities. Marketable Securities, Current [Abstract] Short-term & Long term marketable securities: Preferred stock, shares authorized Preferred stock, shares authorized Preferred stock, shares outstanding Preferred stock, shares outstanding Common stock, shares issued Common stock, shares issued Common stock, shares outstanding Common stock, shares outstanding Treasury stock, shares Treasury stock, shares Cash and Cash Equivalents, Period Increase (Decrease) Net increase (decrease) in cash and cash equivalents Basis of Presentation [Line Items] Basis of presentation. Statement [Table] Range [Axis] Range [Domain] Minimum [Member] Municipal Bonds [Member] Municipal bonds [Member] Condensed Consolidated Statement of Operations and Comprehensive Income (Loss) [Abstract] Intangible Assets Included Operating Costs and Expenses Abstract Intangible assets included operating costs and expenses Intangible assets included operating costs and expenses. Allocated Share-based Compensation Expense Amounts for share-based compensation awards Net Income (Loss) Attributable to Parent [Abstract] Comprehensive Loss Schedule of Inventory, Current [Table Text Block] Schedule of Goodwill [Table Text Block] Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] Summary of payment for share-based compensation awards Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block] Schedule of geographic concentration of the assets Schedule of Comprehensive Income (Loss) [Table Text Block] Warranty liability at beginning of period Product Warranty Accrual Product warranty Product Warranty Accrual, Beginning Balance Product Warranty Accrual, Warranties Issued Additions charged to operations Additions charged to operations Product Warranty Accrual, Payments Deductions from liability Product warranty Finite Lived Intangible Assets Net Total Net Finite-Lived Intangible Assets, Gross Gross Cost of Revenue Cost of net revenues Cost of Revenue, Total Cost of net revenues Schedule of Change in Accounting Estimate [Table] Change in Accounting Estimate by Type [Axis] Change in Accounting Estimate, Type [Domain] Intangible Assets, Amortization Period [Member] Change in Accounting Estimate [Line Items] Revenue Goods Net Percentage Net Revenue, Percentage Revenue goods net percentage. Weighted-average options RSUs, and unissued ESPP shares outstanding Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Cumulative Loss Position Number of years for cumulative loss position Cumulative loss position. Uncertain Income Tax Position Unrecognized Uncertain income tax position unrecognized Uncertain income tax position unrecognized. Sales Revenue, Goods, Net Net revenues by operating segment: Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Inventory Identifiable assets by reportable segment: Entity-Wide Revenue, Major Customer, Percentage Net revenues by geographic region Interest income, net Interest Income (Expense), Nonoperating, Net Loss on goodwill and intangible assets impairment Goodwill and Intangible Asset Impairment Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Accrued expenses, income taxes, and other Available-for-sale Securities, Amortized Cost Basis Amortized Cost Available-for-sale Securities Estimated Fair Value Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 2012(remaining 6 months) Loss on Sale or Disposal of Fixed Asset Loss on sale/disposal of fixed asset Loss on sale or disposal of fixed asset. Europe Latin America and Asia [Member] Europe, Latin America and Asia. Europe Latin America and Asia [Member] United States and Canada [Member] United States and Canada. United States and Canada [Member] Latin America [Member] Latin America. Latin America [Member] Indefinite-lived Intangible Assets, Impairment Losses Impairment loss Licensing Agreements [Member] Acquired software licenses [Member] Debt Instrument, Basis Spread on Variable Rate Borrowings under the facility interest rate Line of Credit Facility, Amount Outstanding Company borrowed against the facility Cash Equivalents and Marketable Securities Held at Bank Cash equivalents and marketable securities held at bank Cash equivalents and marketable securities held at bank. Goodwill and Intangible Assets Impairment Tax Benefit Goodwill and intangible assets impairment tax benefit Goodwill and intangible assets impairment tax benefit. Deferred tax benefits including income tax expense Deferred Other Tax Expense Benefit Acquired Intangible Assets Accumulated Amortization Intangible assets, net of accumulated amortization Acquired intangible assets accumulated amortization. Goodwill and Intangible Assets Impairment Losses Goodwill and intangible assets impairment losses Goodwill and intangible assets impairment losses. Cash Paid During the Year [Abstract] Cash paid during the year. Cash paid during the year for: