Condensed 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 $787 at March 31, 2013 and $627 at December 31,2012 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 $61,702 at March 31,2013 and $59,702 at December 31,2012 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 $12,226 at March 31, 2013 and $11,951 at December 31, 2012 Intangible assets, net of accumulated amortization of $11,951 in 2012 and $10,899 in 2011 Carrying amount of goodwill 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, 33,893 and 33,655 shares issued and outstanding at March 31, 2013 and December 31, 2012, 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 March 31, 2013 and December 31, 2012, respectively Treasury stock at cost; 2,436 common shares at December 31, 2012 and 2011 Total stockholders' equity 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 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. 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 Condensed Consolidated Statements of Operations [Abstract] Net revenues Revenues Cost of net revenues Cost of Revenue 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 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 Income tax provision (benefit) Income tax benefit, including discrete items Income Tax Expense (Benefit) Net loss Net loss 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 Condensed 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 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 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 Balance Sheet Details [Abstract] Balance Sheet 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] Share-based Compensation [Abstract] Share-Based Compensation 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] Principles of Consolidation Consolidation, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Corporate debentures / bonds [Member] Corporate Debentures Bonds [Member] Corporate debentures bonds. Available-for-sale: Available-for-sale Securities [Abstract] Maturity in Years Marketable Securities 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] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Investment Type [Axis] Investment Type Categorization [Domain] Summary of marketable securities available-for-sale 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] 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 Total Net Finite Lived Intangible Assets Net Intangible Assets (Textual) [Abstract] Intangible Assets (Textual) [Abstract] Intangible Assets. M2M Products and Solutions [Member] Trade Secrets [Member] Goodwill (Textual) [Abstract] Goodwill (Textual) [Abstract] Goodwill. Market development funds and price protection Market Development Fund and Price Protection Market development fund and price protection. 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] 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] 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] Amounts for share-based compensation awards Allocated Share-based Compensation Expense Cost of net revenues [Member] Cost of revenues [Member] Cost of Sales [Member] Research and development [Member] Research and Development Expense [Member] Sales and marketing [Member] Selling and Marketing Expense [Member] General and administrative [Member] General and Administrative Expense [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 loss and identifiable assets of segments Schedule of Segment Reporting Information, by Segment [Table Text Block] Net revenues, operating loss and identifiable assets for our reportable segments Segment Reporting Information, Profit (Loss) [Abstract] Mobile Computing Products [Member] Mobile Computing Products [Member] Mobile computing products. Net revenues by reportable segment: Sales Revenue, Goods, Net [Abstract] Operating loss by reportable segment: Operating Income (Loss) [Abstract] Identifiable assets by reportable segment: Segment Reporting Information, Revenue for Reportable Segment [Abstract] United States [Member] UNITED STATES [Member] Canada [Member] CANADA [Member] Europe, Middle East and Africa [Member] Europe Countries [Member] Europe countries. Asia and Australia [Member] Asia Countries [Member] Asia countries. Schedule of geographic concentration of the assets Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block] Schedule of geographic concentration of net revenues Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] Net revenues by geographic region Net Revenues By Geographic Region [Abstract] Net revenues by geographic region. Net Revenue, Percentage Entity-Wide Revenue, Major Customer, Percentage 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. Earnings Per Share (Textual) [Abstract] Earnings Per Share (Textual) [Abstract] Earnings per share. Commitments and Contingencies (Textual) [Abstract] Commitments and Contingencies (Textual) [Abstract] Commitments and contingencies. "Lawsuit" filed date Loss Contingency, Lawsuit Filing Date September Fifteenth Two Thousand Eight [Member] September Fifteenth Two Thousand Eight [Member] September fifteenth two thousand eight. September Eighteenth Two Thousand Eight [Member] September Eighteenth Two Thousand Eight [Member] September eighteenth two thousand eight. Loss Contingencies [Table] Litigation Case [Axis] Litigation Case Type [Domain] Loss Contingencies [Line Items] Total liability for unrecognized tax benefits included other long-term liabilities Unrecognized Tax Benefits Period Increase Decrease Net deferred tax assets Deferred Tax Assets Liabilities Net Common stock, par value Common Stock, Par or Stated Value Per Share 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. Short-term & Long term marketable securities: Marketable Securities, Current [Abstract] Range [Axis] Range [Domain] Minimum [Member] Minimum [Member] Intangible assets included operating costs and expenses Intangible Assets Included Operating Costs and Expenses [Abstract] Intangible assets included operating costs and expenses. Product warranty Warranty liability at beginning of period Warranty liability at end of period Product Warranty Accrual Additions charged to operations Product Warranty Accrual, Warranties Issued Deductions from liability Product Warranty Accrual, Payments Gross Finite-Lived Intangible Assets, Gross Schedule of Change in Accounting Estimate [Table] Change in Accounting Estimate [Line Items] Weighted-average options RSUs, and unissued ESPP shares outstanding Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Interest income, net Interest Income (Expense), Nonoperating, Net Impairment of goodwill and purchased intangible assets Goodwill and intangible assets impairment Goodwill and Intangible Asset Impairment Accrued expenses, income taxes, and other Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Amortized Cost Available-for-sale Securities, Amortized Cost Basis Estimated Fair Value Available-for-sale Securities Europe, Latin America and Asia [Member] Europe Latin America and Asia [Member] Europe, Latin America and Asia. United States and Canada [Member] United States and Canada [Member] United States and Canada. Latin America [Member] Latin America [Member] Latin America. Acquired software licenses [Member] Licensing Agreements [Member] Outstanding borrowings under the credit facility Line of Credit Facility, Amount Outstanding Cash equivalents and marketable securities held at bank Cash Equivalents and Marketable Securities Held at Bank Cash equivalents and marketable securities held at bank. Intangible assets, net of accumulated amortization Acquired Intangible Assets Accumulated Amortization Acquired intangible assets accumulated amortization. Cash paid during the year for: Cash Paid During Year [Abstract] Cash paid during the year. Proceeds from the issuance of short-term debt Proceeds from (Repayments of) Short-term Debt Principal repayments of short-term debt Repayments of Short-term Debt Net revenues by geographic region Revenue from External Customers by Geographic Region Revenue from external customers by geographic region. Maximum [Member] Maximum [Member] Basic and Diluted weighted-average common and potential common shares outstanding Basic and diluted Weighted Average Number of Shares Outstanding, Basic and Diluted Payment of share based compensation awards Payment Of Share Based Compensation Awards [Abstract] Payment Of Share Based Compensation Awards [Abstract] Schedule of Indefinite-Lived Intangible Assets [Table] Indefinite-lived Intangible Assets by Major Class [Axis] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets [Line Items] Summary of accrued warranty obligations Schedule of Product Warranty Liability [Table Text Block] Assets By Geographic Concentration Geographic Areas, Long-Lived Assets [Abstract] Net unrealized gain Available-for-sale Securities, Gross Unrealized Gain (Loss) 2013 (remaining 9 months) Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Amount borrowed against the facility Line of Credit Facility, Maximum Amount Outstanding During Period General and administrative expenses [Member] Operating Expense [Member] Income Statement Location [Axis] Income Statement Location [Domain] Summary of amortization expenses of purchased intangible assets Purchased Intangible Asset Amortization Expense Classification Table Text Block Purchased intangible asset amortization expense classification. Goodwill [Member] Goodwill [Member] Goodwill. Basic and diluted Earnings Per Share, Basic and Diluted Condensed Consolidated Statements of Comprehensive Income (Loss) [Abstract] Unrealized gain (loss) on cash equivalents and marketable securities, net of tax Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Deferred revenue Deferred Revenue Non-cash income tax expense (benefit) Non Cash Income Tax Expense Benefit Non Cash Income Tax Expense Benefit Basis of Presentation [Abstract] Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Line Items] Balance Sheet Details (Textual) [Abstract] Balance Sheet Details (Textual) [Abstract] Balance Sheet Details (Textual) [Abstract] Summary of payment for share-based compensation awards Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] September Twenty Fourth Two Thousand Ten [Member] September Twenty Fourth Two Thousand Ten [Member] September Twenty Fourth Two Thousand Ten [Member] Deferred tax benefits including income tax expense Deferred Other Tax Expense Benefit Valuation allowance Valuation Allowance Amount Product warranty description Standard Product Warranty Description Product warranty period Product Warranty Coverage Period Product warranty coverage period. Schedule of Balance Sheet Details [Table] Schedule of Balance Sheet Details [Table] Balance Sheet Details [Line Items] Balance Sheet Details [Line Items] Income Taxes (Textual) [Abstract] Income Taxes (Textual) [Abstract] Income Taxes (Textual) [Abstract] Interest expense related to uncertain tax positions Interest Expense Related to Uncertain Tax Positions Interest expense related to uncertain tax positions. Uncertain income tax (less than) Uncertain Income Tax Position Unrecognized Uncertain income tax position unrecognized. Net loss per share: Earnings Per Share, Basic and Diluted [Abstract] Summary of accrued Expenses Schedule of Accrued Liabilities [Table Text Block] Payroll and related expenses Employee-related Liabilities, Current Impairment loss Finite Lived Intangible Assets Impairment Losses Finite lived intangible assets impairment losses. Expected unrecognized tax benefits due to expiration of limitations applicable to the 2008 taxable year Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations Restricted marketable securities Marketable Securities, Restricted, Current Restricted cash Restricted Cash and Cash Equivalents, Current Short-term margin loan facility Line of Credit, Current Restricted cash relating to short-term debt Proceeds from (Repayments of) Restricted Cash, Financing Activities Amortization of purchased intangible assets Amortization Of Intangible Assets Purchases of intangible assets Impairment of Intangible Assets, Finite-lived Goodwill impairment charges Goodwill, Impairment Loss Accumulated Impairment Intangible Assets Impaired Accumulated Impairment Loss Intangible assets impaired accumulated impairment loss.