Finite-Lived Intangible Assets [Abstract] Intangible Assets Intangible Assets Disclosure [Text Block] Employee Benefit Plan [Abstract] 11. Employee Benefit Plan [Abstract] Matching contributions to the RRSP and 401(k) plans Defined Contribution Plan, Cost Recognized Income Taxes [Abstract] Income Taxes [Abstract] Income Taxes Income Tax Disclosure [Text Block] Earnings Per Share [Abstract] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Award Type and Plan Name [Axis] Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Award Type and Plan Name [Axis] Share-based Compensation Arrangements by Share-based Payment Award, Award Type and Plan Name [Domain] Share-based Compensation Arrangements by Share-based Payment Award, Award Type and Plan Name [Domain] Employee stock options [Member] Stock Options [Member] Restricted stock units [Member] Restricted Stock Units (RSUs) [Member] Employee stock purchase plans [Member] Employee Stock [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share, by Antidilutive Securities [Axis] Antidilutive Securities Excluded from Computation of Earnings Per Share, by Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Stock Compensation Plan [Member] Stock Compensation Plan [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Anti-dilutive securities (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Effective income tax rate Effective Income Tax Rate, Continuing Operations Unrecognized tax benefits Unrecognized Tax Benefits Unrecognized tax benefits that would impact effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Unrecognized tax benefits, interest on income taxes accrued Unrecognized Tax Benefits, Interest on Income Taxes Accrued Property And Equipment Net [Abstract] Property And Equipment Net Property and Equipment - Net Property, Plant and Equipment Disclosure [Text Block] Schedule of Finite-Lived Intangible Assets by Major Class [Table Text Block] Schedule of Finite-Lived Intangible Assets by Major Class [Table Text Block] Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Stockholders' Equity Attributable to Parent [Abstract] Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions And Allocation of Recognized Period Costs [Table Text Block] Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions And Allocation of Recognized Period Costs [Table Text Block] Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Shares Available for Grant [Table Text Block] Schedule of Shares Available for Grant [Table Text Block] Schedule of Shares Available for Grant [Table Text Block] Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block] Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block] Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Type of Cost and Expense [Table Text Block] Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Type of Cost and Expense [Table Text Block] Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Type of Cost and Expense [Table Text Block] Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] Commitments and Contingencies Disclosure [Abstract] Unrecorded Unconditional Purchase Obligation [Table] Unrecorded Unconditional Purchase Obligation [Table] Unrecorded Unconditional Purchase Obligation by Category of Item Purchased [Axis] Unrecorded Unconditional Purchase Obligation by Category of Item Purchased [Axis] Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain] Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain] Independent Contract Manufacturing [Member] Independent Contract Manufacturing [Member] Independent Contract Manufacturing [Member] Other Purchases [Member] Other Purchases [Member] Other Purchases [Member] Unrecorded Unconditional Purchase Obligation [Line Items] Unrecorded Unconditional Purchase Obligation [Line Items] Open purchase orders Unrecorded Unconditional Purchase Obligation Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Schedule of Product Warranty Liability [Table Text Block] Schedule of Product Warranty Liability [Table Text Block] Commitments and Contingencies [Abstract] 7. Commitments and Contingencies [Abstract] Schedule of Warranties [Table] Schedule of Warranties [Table] Schedule of Warranties [Table] Products and Services [Axis] Products and Services [Axis] Products and Services [Domain] Products and Services [Domain] Hardware, Product Warranty [Member] Hardware, Product Warranty [Member] Hardware, Product Warranty [Member] Software, Product Warranty [Member] Software, Product Warranty [Member] Software, Product Warranty Product Warranty [Line Items] Product Warranty [Line Items] Product Warranty [Line Items] Standard product warranty, term Standard Product Warranty, Term Standard Product Warranty, Term Movement in Standard Product Warranty Accrual [Roll Forward] Movement in Standard Product Warranty Accrual [Roll Forward] Accrued warranty balance - beginning of the period Standard Product Warranty Accrual Warranty costs incurred Standard Product Warranty Accrual, Payments Provision for warranty Standard Product Warranty Accrual, Warranties Issued Adjustments to previous estimates Standard Product Warranty Accrual, Preexisting, Increase (Decrease) Accrued warranty balance - end of the period Employee Benefit Plans Compensation and Employee Benefit Plans [Text Block] Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Table Text Block] Property, Plant and Equipment [Table Text Block] Income Statement [Abstract] Statement [Table] Statement [Table] Statement, Scenario [Axis] Statement, Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Statement [Line Items] Statement [Line Items] REVENUE: Revenue, Net [Abstract] Product Sales Revenue, Goods, Net Services Sales Revenue, Services, Net Ratable and other revenue Ratable and other revenue, Net Aggregate revenue during the period from ratable product and services, and other revenue rendered in the normal course of business, after deducting returns, allowances and discounts. Total revenue Revenue, Net COST OF REVENUE: Cost of Goods and Services Sold [Abstract] Product Cost of Goods Sold Services Cost of Services Ratable and other revenue Cost of Ratable and Other Revenue Total costs related to ratable products and services, and other revenue rendered by an entity during the reporting period Total cost of revenue Cost of Goods and Services Sold GROSS PROFIT: Gross Profit [Abstract] Product Product Gross Profit Products Gross profit is the aggregate revenue less cost of goods sold directly attributable to the revenue generation activity. Services Services Gross Profit Service Gross Profit is the aggregate revenue less cost of services sold or operating expenses directly attributable to the revenue generation activity. Ratable and other revenue Ratable and Other Revenue Gross Profit Gross Profit is the aggregated revenue less the cost of ratable goods and services sold and cost of other revenue or operating expenses directly attributable to the revenue generation activity. Total gross profit Gross Profit OPERATING EXPENSES: Operating Expenses [Abstract] Research and development Research and Development Expense Sales and marketing Selling and Marketing Expense General and administrative General and Administrative Expense Total operating expenses Operating Expenses OPERATING INCOME Operating Income (Loss) INTEREST INCOME Investment Income, Net OTHER (EXPENSE) INCOME—Net Nonoperating Income (Expense) INCOME BEFORE INCOME TAXES Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest PROVISION FOR INCOME TAXES Income Tax Expense (Benefit) NET INCOME Net Income (Loss) Attributable to Parent Net income per share: Basic Earnings Per Share, Basic Diluted Earnings Per Share, Diluted Weighted-average shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic Weighted Average Number of Shares Outstanding, Basic Diluted Weighted Average Number of Shares Outstanding, Diluted Accounting Policies [Abstract] Presentation and Preparation of Consolidated Financial Statements [Policy Text Block] Presentation and Preparation of Consolidated Financial Statements [Policy Text Block] Presentation and Preparation of Consolidated Financial Statements [Policy Text Block] Revenue Recognition, Policy [Policy Text Block] Revenue Recognition, Policy [Policy Text Block] Foreign Currency Derivatives [Abstract] Foreign Currency Derivatives Foreign Currency Disclosure [Text Block] Derivative [Table] Derivative [Table] Derivative Instrument Risk [Axis] Derivative Instrument Risk [Axis] Derivative Contract Type [Domain] Derivative Contract Type [Domain] Canada, Dollars Canada, Dollars Euro Member Countries, Euro Euro Member Countries, Euro United Kingdom, Pounds United Kingdom, Pounds Derivative [Line Items] Derivative [Line Items] Notional Amount of Foreign Currency Derivative Purchase Contracts Notional Amount of Foreign Currency Derivative Purchase Contracts Deferred Revenue Disclosure [Abstract] Deferred Revenue Deferred Revenue Disclosure [Text Block] Inventory Disclosure [Abstract] Inventory, Net [Abstract] Inventory, Net [Abstract] Raw materials Inventory, Raw Materials, Net of Reserves Finished goods Inventory, Finished Goods, Net of Reserves Inventory Inventory, Net Balance Sheet Parentheticals [Abstract] Balance Sheet Parentheticals [Abstract] Allowance for doubtful accounts Allowance for Doubtful Accounts Receivable, Current Common Stock, par value Common Stock, Par or Stated Value Per Share Common Stock, shares authorized Common Stock, Shares Authorized Common Stock, shares issued Common Stock, Shares, Issued Common Stock, shares outstanding Common Stock, Shares, Outstanding Financial Instruments and Fair Value [Abstract] Financial Instruments and Fair Value [Abstract] Summary of Investments [Table Text Block] Schedule of Amortized Costs, Unrealized Gains and Losses, and Fair Value of Available For Sale Securities [Table Text Block] Schedule of Amortized Costs, Unrealized Gains and Losses, and Fair Value of Available For Sale Securities [Table Text Block] Schedule of Unrealized Loss on Investments [Table Text Block] Schedule of Unrealized Loss on Investments [Table Text Block] Investments Classified by Contractual Maturity Date [Table Text Block] Investments Classified by Contractual Maturity Date [Table Text Block] Fair Value, by Balance Sheet Grouping and Measurement Inputs, Disclosure [Table Text Block] Fair Value, Assets Measured on Recurring Basis [Table Text Block] Inventory Inventory Disclosure [Text Block] Income Per Share Earnings Per Share [Text Block] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value, by Balance Sheet Grouping, Disclosure Item Amounts [Axis] Fair Value, by Balance Sheet Grouping, Disclosure Item Amounts [Axis] Fair Value, Disclosure Item Amounts [Domain] Fair Value, Disclosure Item Amounts [Domain] Estimate of Fair Value [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Reported as [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] Schedule of Available-for-sale Securities, Major Types of Debt and Equity Securities [Axis] Schedule of Available-for-sale Securities, Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] U.S. government and agency securities [Member] US Treasury and Government [Member] Corporate debt securities [Member] Corporate Debt Securities [Member] Commercial paper [Member] Commercial Paper, Not Included with Cash and Cash Equivalents [Member] Municipal bonds [Member] US States and Political Subdivisions Debt Securities [Member] Certificates of deposit and term deposits [Member] Certificates of Deposit [Member] Money market funds [Member] Money Market Funds, Excluding Commercial Paper [Member] Money Market Funds, Excluding Commercial Paper [Member] Fair Value by Measurement Frequency [Axis] Fair Value by Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Recurring [Member] Fair Value, Measurements, Recurring [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Cash equivalents [Member] Cash Equivalents, Line Item [Member] Cash Equivalents, Line Item [Member] Short-term investments [Member] Short Term Investments, Line Item [Member] Short Term Investments, Line Item [Member] Prepaid expenses and other current assets [Member] Prepaid Expenses and Other Current Assets, Line Item [Member] Prepaid Expenses and Other Current Assets, Line Item [Member] Long-term investments [Member] Long Term Investments, Line Item [Member] Long Term Investments, Line Item [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value, Measurements, Fair Value Hierarchy [Domain] Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Short-term investments Short-term Investments Available-for-sale securities, Fair Value Disclosure Available-for-sale Securities, Fair Value Disclosure Foreign Currency Contract, Asset, Fair Value Disclosure Foreign Currency Contract, Asset, Fair Value Disclosure Total Assets, Fair Value Disclosure Assets, Fair Value Disclosure Long-term investments Long-term Investments Equity [Abstract] Stockholder's Equity Stockholders' Equity Note Disclosure [Text Block] Inventory [Table Text Block] Schedule of Inventory, Current [Table Text Block] Schedule of Property, Plant and Equipment [Table] Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment by Type [Axis] Property, Plant and Equipment by Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Land [Member] Land [Member] Building and building improvements [Member] Building and Building Improvements [Member] Evaluation units [Member] Evaluation units [Member] Evaluation units [Member] Computer equipment and software [Member] Computer Equipment [Member] Furniture and fixtures [Member] Furniture and Fixtures [Member] Leasehold improvements and tooling [Member] Leaseholds and Leasehold Improvements [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Property, Plant and Equipment, Net, by Type [Abstract] Property, Plant and Equipment, Net, by Type [Abstract] Total property and equipment Property, Plant and Equipment, Gross Less: accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property and equipment - net Property, Plant and Equipment, Net Payments to acquire certain real property Payments to Acquire Real Estate Depreciation expense Depreciation Segment and Significant Customer Information [Abstract] Segment and Significant Customer Information [Abstract] Concentration Risk [Table] Concentration Risk [Table] Concentration Risk by Benchmark [Axis] Concentration Risk by Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Sales Revenue [Member] Sales Revenue [Member] Sales Revenue [Member] Concentration Risk by Type [Axis] Concentration Risk by Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Customer Concentration Risk [Member] Customer Concentration Risk [Member] Concentration Risk [Line Items] Concentration Risk [Line Items] Number of customers accounting for 10% or more of concentration risk Number Of Customers Accounting For Ten Percent Or More Of Concentration Risk Number Of Customers Accounting For Ten Percent Or More Of Concentration Risk Concentration risk, percent Concentration Risk, Percent Concentration Risk, Percent Deferred Revenue Arrangement, by Type [Table] Deferred Revenue Arrangement, by Type [Table] Product [Member] Product [Member] Services [Member] Services [Member] Services [Member] Ratable and other revneue [Member] Ratable and Other Revneue [Member] Ratable and Other Revneue [Member] Deferred Revenue Arrangement [Line Items] Deferred Revenue Arrangement [Line Items] Current Deferred Revenue, Current Non-current Deferred Revenue, Noncurrent Total deferred revenue Deferred Revenue Deferred Revenue, by Arrangement, Disclosure [Table Text Block] Deferred Revenue, by Arrangement, Disclosure [Table Text Block] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Business Combinations [Abstract] Acquisitions Business Combination Disclosure [Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] Balance—December 31, 2011 Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Balance—September 30, 2012 RSUs expected to vest—September 30, 2012 Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Outstanding, Number Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Outstanding, Number Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] Balance—December 31, 2011, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Forfeited, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period, Weighted Average Grant Date Fair Value Vested, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Balance—September 30, 2012, Weighted Average Grant Date Fair Value RSUs expected to vest, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Weighted Average Grant Date Fair Value Investment and Fair Value Measurements Financial Instruments Disclosure [Text Block] Statement of Financial Position [Abstract] ASSETS Assets [Abstract] CURRENT ASSETS: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Accounts receivable, net of allowance for doubtful accounts of $234 and $336 at September 30, 2012 and December 31, 2011, respectively Accounts Receivable, Net, Current Inventory Deferred tax assets Deferred Tax Assets, Net, Current Prepaid expenses and other current assets Prepaid Expense and Other Assets Deferred cost of revenues Deferred Costs, Current Total current assets Assets, Current PROPERTY AND EQUIPMENT—Net DEFERRED TAX ASSETS—Non-current Deferred Tax Assets, Net, Noncurrent LONG-TERM INVESTMENTS OTHER ASSETS Other Assets, Noncurrent TOTAL ASSETS Assets LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity [Abstract] CURRENT LIABILITIES: Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Accrued liabilities Accrued Liabilities, Current Accrued payroll and compensation Employee-related Liabilities, Current Deferred revenue Total current liabilities Liabilities, Current DEFERRED REVENUE—Non-current OTHER NON-CURRENT LIABILITIES Other Liabilities, Noncurrent Total liabilities Liabilities COMMITMENTS AND CONTINGENCIES (Note 7) Commitments and Contingencies STOCKHOLDERS' EQUITY: Common stock, $0.001 par value - 300,000 shares authorized; 161,217 and 156,401 shares issued and 159,808 and 154,992 shares outstanding at September 30, 2012 and December 31, 2011, respectively Common Stock, Value, Issued Additional paid-in-capital Additional Paid in Capital, Common Stock Treasury stock Treasury Stock, Value Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Retained earnings Retained Earnings (Accumulated Deficit) Total stockholders' equity Stockholders' Equity Attributable to Parent TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity Cash payment Business Acquisition, Cost of Acquired Entity, Cash Paid Amount of total consideration withheld in escrow as security for acquiree's indemnification obligations Business Acquisition, Cost of Acquired Entity, Cash to be Paid, Amount Withheld in Escrow Business Acquisition, Cost of Acquired Entity, Cash to be Paid, Amount Withheld in Escrow Price allocated to tangible assets Business Acquisition, Purchase Price Allocation, Tangible Assets Price allocated to liabilities Business Acquisition, Purchase Price Allocation, Liabilities Assumed Price allocated to indentifiable intangible assets Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets Amortizable life of purchased indentifiable intangible assets (in years) Acquired Finite-lived Intangible Asset, Weighted Average Useful Life Amount released to selling sharesholders from escrow Payments for Previous Acquisition Net income Basic shares: Weighted Average Number of Shares Outstanding, Basic [Abstract] Weighted-average common shares outstanding-basic (in shares) Diluted shares: Effect of potentially dilutive securities: Weighted Average Number Diluted Shares Outstanding Adjustment [Abstract] Employee stock options, restricted stock units, and purchase plan (in shares) Incremental Common Shares Attributable to Share-based Payment Arrangements Weighted-average shares used to compute diluted net income per share (in shares) Net income per share: Earnings Per Share, Basic and Diluted [Abstract] Basic (in dollars per share) Diluted (in dollars per share) Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Statement, Geographical [Axis] Statement, Geographical [Axis] Segment, Geographical [Domain] Segment, Geographical [Domain] Americas [Member] Americas [Member] Americas [Member] United States UNITED STATES Canada [Member] Canada [Member] Canada [Member] Other Americas [Member] Other Americas [Member] Other Americas [Member] EMEA [Member] Europe, Middle East and Africa [Member] Europe, Middle East and Africa [Member] APAC [Member] Asia Pacific and Japan [Member] Asia Pacific and Japan [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Number of business activities Number of Business Activities Number of business activities Number of segment managers responsible for operations Number of Segment Managers Responsible for Operations Number of Segment Managers Responsible for Operations Revenue Property and equipment - net Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Class of Treasury Stock [Table] Class of Treasury Stock [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis] 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, Report Line [Domain] Cost of Sales [Member] Cost of Sales [Member] Research and Development Expense [Member] Research and Development Expense [Member] Selling and Marketing Expense [Member] Selling and Marketing Expense [Member] General and Administrative Expense [Member] General and Administrative Expense [Member] Employee Stock Purchase Plan [Member] Stock Options [Member] Equity, Class of Treasury Stock [Axis] Equity, Class of Treasury Stock [Axis] Class of Treasury Stock [Domain] Class of Treasury Stock [Domain] Common Stock [Member] Common Stock [Member] Convertible Preferred Stock [Member] Convertible Preferred Stock [Member] Equity, Class of Treasury Stock [Line Items] Equity, Class of Treasury Stock [Line Items] Total compensation cost not yet recognized Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized Total compensation cost not yet recognized, period for recognition (in years) Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Expected term in years Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Volatility (%) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Risk-free interest rate (%) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Dividend rate (%) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Estimated fair value ($) Share-based Compensation Arrangement by Share-based Payment Award, Estimated Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Estimated Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Balance - Beginning (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Balance - Ending (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] Balance - Beginning (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Exercised (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Balance - Ending (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Options vested and expected to vest, Outstanding (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Options vested and expected to vest, Weighted average exercise price (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Options vested and expected to vest, Weighted average remaining contractual life (in years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Options vested and expected to vest, Aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Options vested and exercisable, Outsanding (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Options vested and exercisable, Weighted average exercise price (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Options vested and exercisable, Weighted average remaining contractual life (in years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Options vested and exercisable, Aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Employee Stock Purchase Plan, Additional Information [Abstract] Employee Stock Purchase Plan, Additional Information [Abstract] Employee Stock Purchase Plan, Additional Information [Abstract] Number of shares authorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Maximum employee subscription rate Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate Employee price as percent of market price, lesser of market prices as of offering date or purchase date Share-based Compensation Arrangement by Share-based Payment Award, Employee Price as Percent of Market Price, Offering Date or Purchase Date Share-based Compensation Arrangement by Share-based Payment Award, Employee Price as Percent of Market Price, Offering Date or Purchase Date Maximum number of shares per employee Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Per Employee Share-based Compensation, Allocation in Financial Statements [Abstract] Share-based Compensation, Allocation and Classification in Financial Statements [Abstract] Share-based compensation expense Allocated Share-based Compensation Expense Options--non-employee Share-based Goods and Nonemployee Services Transaction, Expense Share-based compensation expense, employees and non-employees Allocated Share-based Compensation Expense, Employees and Non-employees Allocated Share-based Compensation Expense, Employees and Non-employees Loss Contingencies [Table] Loss Contingencies [Table] Loss Contingencies by Nature of Contingency [Axis] Loss Contingencies by Nature of Contingency [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Number of patents involved in litigation Number of Patents Involved in Litigation Number of Patents Involved in Litigation Accrual for expected litigation settlement Loss Contingency Accrual, at Carrying Value Share-based Compensation Arrangement by Share-based Payment Award, Shares Available for Grant [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Shares Available for Grant [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Shares Available for Grant [Roll Forward] Balance—December 31, 2011 Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Authorized Share-based Compensation Arrangement by Share-based Payment Award, Additional Shares Authorized for Grant Share-based Compensation Arrangement by Share-based Payment Award, Additional Shares Authorized for Grant Options granted Options forfeited Options exercised RSUs granted RSUs forfeited RSUs exercised Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercises in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercises in Period Balance—September 30, 2012 DEI [Abstract] DEI [Abstract] Document Information [Table] Document Information [Table] Document Information, Document [Axis] Document Information, Document [Axis] Document [Domain] Document [Domain] Document Information [Line Items] Document Information [Line Items] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Current Fiscal Year End Date Current Fiscal Year End Date Entity Current Reporting Status Entity Current Reporting Status Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Segment and Significant Customer Information Segment and Significant Customer Information [Text Block] Segment and Significant Customer Information [Text Block] Revenue and property and equipment by geographic region [Table Text Block] Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] Summary of Significant Accounting Policies [Abstract] 1. Summary of Significant Accounting Policies [Abstract] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Statement of Cash Flows [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Amortization of investment premiums Accretion (Amortization) of Discounts and Premiums, Investments Stock-based compensation Share-based Compensation Excess tax benefit from employee stock option plans Excess Tax Benefit from Share-based Compensation, Operating Activities Other non-cash items, net Other Noncash Income (Expense) Changes in operating assets and liabilities: Increase (Decrease) in Other Operating Assets and Liabilities, Net [Abstract] Accounts receivable—net Increase (Decrease) in Accounts Receivable Inventory Increase (Decrease) in Inventories Deferred tax assets Increase (Decrease) in Deferred Income Taxes Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Other assets Increase (Decrease) in Other Operating Assets Accounts payable Increase (Decrease) in Accounts Payable Accrued liabilities Increase (Decrease) in Accrued Liabilities Accrued payroll and compensation Increase (Decrease) in Employee Related Liabilities Other liabilities Increase (Decrease) in Other Operating Liabilities Deferred revenue Increase (Decrease) in Deferred Revenue Income taxes payable Increase (Decrease) in Income Taxes Payable Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities CASH FLOWS FROM INVESTING ACTIVITIES: Net Cash Provided by (Used in) Investing Activities [Abstract] Purchase of investments Payments to Acquire Investments Sales of investments Gain (Loss) on Sale of Investments Maturities and sales of investments Proceeds from Sale of Available-for-sale Securities Purchases of property and equipment Payments to Acquire Productive Assets Payment made in connection with business acquisition Payments to Acquire Businesses, Net of Cash Acquired Deposits of restricted cash Increase (Decrease) in Restricted Cash 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 issuance of common stock Proceeds from Stock Options Exercised Offering costs paid in connection with Initial Public Offering Payments of Stock Issuance Costs Excess tax benefit from employee stock option plans Excess Tax Benefit from Share-based Compensation, Financing Activities Net cash provided by 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) CASH AND CASH EQUIVALENTS—Beginning of period CASH AND CASH EQUIVALENTS—End of period SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION: Supplemental Cash Flow Information [Abstract] Cash paid (refunded) for income taxes Income Taxes Paid, Net NON-CASH INVESTING AND FINANCING ACTIVITIES: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Purchase of property and equipment not yet paid Capital Expenditures Incurred but Not yet Paid Liability incurred in connection with business acquisition Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Amortized Cost Available-for-sale Debt Securities, Amortized Cost Basis Unrealized Gains Available-for-sale Securities, Gross Unrealized Gains Unrealized Losses Available-for-sale Securities, Gross Unrealized Losses Total Fair Value Available-for-sale Securities, Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] Less Than 12 Months, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Less Than 12 Months, Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 12 Months or Greater, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 12 Months or Greater, Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses Total, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Total, Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] Due within one year Total Fair Value Statement of Income and Comprehensive Income [Abstract] Other comprehensive income: Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent [Abstract] Foreign currency translation gains (losses) Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Portion Attributable to Parent Unrealized gains (losses) on investments Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax Unrealized losses on cash flow hedges Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax, Portion Attributable to Parent Tax provision related to items of other comprehensive income Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Net change in accumulated other comprehensive income Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Rent expense Operating Leases, Rent Expense, Net Fiscal Years: Operating Leases, Future Minimum Payments Due [Abstract] Rental Payment, 2012 (remainder) Operating Leases, Future Minimum Payments Due, Current Rental Payment, 2013 Operating Leases, Future Minimum Payments, Due in Two Years Rental Payment, 2014 Operating Leases, Future Minimum Payments, Due in Three Years Rental Payment, 2015 Operating Leases, Future Minimum Payments, Due in Four Years Operating Leases, Future Minimum Payments, Due Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Rental Payment, Thereafter Operating Leases, Future Minimum Payments Due, Due After Four Years Operating Leases, Future Minimum Payments Due, Due After Four Years Rental Payment, Total Operating Leases, Future Minimum Payments Due Finite-Lived Intangible Assets, Net [Abstract] Finite-Lived Intangible Assets, Net [Abstract] Finite-Lived Intangible Assets, Gross Finite-Lived Intangible Assets, Gross Finite-Lived Intangible Assets, Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Finite-Lived Intangible Assets, Net Finite-Lived Intangible Assets, Net Amortization expense Finite-Lived Intangible Assets, Amortization Expense Fiscal Years: Finite-Lived Intangible Assets, Future Amortization Expense [Abstract] 2012 (remainder) Future Amortization Expense, Remainder of Fiscal Year 2013 Future Amortization Expense, Year One 2014 Future Amortization Expense, Year Two 2015 Future Amortization Expense, Year Three 2016 Future Amortization Expense, Year Four Total Finite-Lived Intangible Assets, Future Amortization Expense Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]