Notes To Financial Statements [Abstract] Notes to Financial Statements [Abstract] Statement [Table] Statement [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Statement [Line Items] Statement [Line Items] Schedule Of Earnings Per Share Basic And Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Disclosure Computation Of Basic And Diluted Net Profit Per Share Attributable To Common Stock [Abstract] Disclosure - Computation of Basic and Diluted Net Profit Per Share Attributable to Common Stock [Abstract] Net income Net Income (Loss) Attributable to Parent Weighted-average common shares outstanding, basic Weighted Average Number of Shares Outstanding, Basic Dilutive effect of potential common stock Weighted Average Number Diluted Shares Outstanding Adjustment Total shares, diluted Weighted Average Number of Shares Outstanding, Diluted Net income per share, basic Earnings Per Share, Basic Net income per share, diluted Earnings Per Share, Diluted Income Statement [Abstract] Net revenues Revenue, Net Cost of net revenues Cost of Revenue Gross profit Gross Profit Operating expenses: Operating Expenses [Abstract] Selling, general and administrative Selling, General and Administrative Expense Research and development Research and Development Expense Total operating expenses Operating Expenses Income from operations Operating Income (Loss) Interest and other income (expenses), net Nonoperating Income (Expense) Net income before provision for income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Provision for income taxes Income Tax Expense (Benefit) Net income Net income per share: Earnings Per Share [Abstract] Basic (in usd per share) Diluted (in usd per share) Shares used in computing net income per share: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic (in shares) Diluted (in shares) Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Disclosure Inventories [Abstract] Disclosure - Inventories [Abstract] Raw materials Inventory, Raw Materials, Net of Reserves Work in process Inventory, Work in Process, Net of Reserves Finished goods Inventory, Finished Goods, Net of Reserves Total Inventories Inventory, Net Document Documentand Entity Information [Abstract] Document and Entity Information [Abstract] Entities [Table] Entities [Table] Document Information [Line Items] Document Information [Line Items] Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Disclosure Short Term And Long Term Marketable Securities [Abstract] Disclosure - Short-Term and Long-Term Marketable Securities [Abstract] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Fair Value by Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring [Member] Fair Value, Measurements, Recurring [Member] Schedule of Fair Value of Separate Accounts by Major Category of Investment [Axis] Investment Type [Axis] Schedule of Fair Value of Separate Accounts by Major Category of Investment, Category [Domain] Investments [Domain] Short-term Investments Short-term Investments [Member] Long-term Investments Long Term Investments [Member] Long Term Investments [Member] Schedule of Available-for-sale Securities, Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] Commercial paper Commercial Paper [Member] Corporate bonds Corporate Bonds [Member] Corporate Bonds [Member] U.S. government agency bonds Agency Securities [Member] Asset-backed securities Asset-backed Securities [Member] Municipal securities Municipal Securities [Member] Municipal Securities [Member] U.S. dollar dominated foreign corporate bonds Foreign Corporate Debt Securities [Member] U.S. government treasury bonds US Treasury and Government [Member] Certificates of deposit Certificates of Deposit [Member] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Amortized Cost Available-for-sale Securities, Amortized Cost Basis Gross Unrealized Gains Available For Sale Securities Gross Unrealized Gain In Investments Available For Sale Securities Gross Unrealized Gain In Investments Gross Unrealized Losses Available For Sale Securities Gross Unrealized Loss In Investments Available For Sale Securities Gross Unrealized Loss In Investments Total available for sale short-term and long-term marketable securities Available-for-sale Securities Disclosure Accrued Liabilities [Abstract] Disclosure - Accrued Liabilities [Abstract] Accrued payroll and benefits Employee-related Liabilities, Current Accrued sales rebate Accrued Marketing Costs, Current Accrued sales tax and value added tax Sales and Excise Tax Payable, Current Accrued sales and marketing expenses Accrued Sales And Marketing Current Accrued Sales and Marketing, Current Accrued accounts payable Accrued Accounts Payable Accrued Accounts Payable Accrued warranty Standard Product Warranty Accrual, Current Accrued professional fees Accrued Professional Fees, Current Accrued income taxes Accrued Income Taxes, Current Other accrued liabilities Other Accrued Liabilities, Current Total Accrued Liabilities Accrued Liabilities, Current Disclosure Balance Sheet Components Additional Information [Abstract] Disclosure - Balance Sheet Components - Additional Information [Abstract] Scanners, Warranty period Standard Product Warranty Time Period Standard Product Warranty Time Period Disclosure Net Revenues By Geographic Area [Abstract] Disclosure - Net Revenues by Geographic Area [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Statement, Geographical [Axis] Geographical [Axis] Segment, Geographical [Domain] Geographical [Domain] United States UNITED STATES the Netherlands NETHERLANDS Other international Other International [Member] Other International [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Investments, Debt and Equity Securities [Abstract] Due in one year or less Available-for-sale Securities, Current Due in greater than one year Available-for-sale Securities, Noncurrent Segments and Geographical Information Segment Reporting Disclosure [Text Block] Award Type [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Market Performance Based Restricted Stock Units Market Performance Based Restricted Stock Units [Member] Market Performance Based Restricted Stock Units [Member] Stock-based Compensation Expense Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] Stock Option Activity Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Summary Of Nonvested Shares Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Summary Of Nonvested Shares Schedule of Nonvested Performance-based Units Activity [Table Text Block] Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block] Disclosure Long Lived Assets By Geographic Area [Abstract] Disclosure - Long-Lived Assets by Geographic Area [Abstract] MEXICO MEXICO Long-lived assets Long-Lived Assets Statement of Financial Position [Abstract] ASSETS Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Marketable securities, short-term Available-for-sale Securities, Debt Securities, Current Accounts receivable, net of allowances for doubtful accounts and returns of $2,770 and $2,472, respectively Accounts Receivable, Net, Current Inventories Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Total current assets Assets, Current Marketable securities, long-term Available-for-sale Securities, Debt Securities, Noncurrent Property, plant and equipment, net Property, Plant and Equipment, Net Goodwill and intangible assets, net Goodwill Deferred tax assets Deferred Tax Assets, Net of Valuation Allowance, Noncurrent 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 Deferred revenues Deferred Revenue, Current Total current liabilities Liabilities, Current Taxes Payable Taxes Payable Other long-term liabilities Other Liabilities, Noncurrent Total liabilities Liabilities Commitments and contingencies (Note 6 and 7) Commitments and Contingencies Stockholders' equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, $0.0001 par value (5,000 shares authorized; none issued) Preferred Stock, Value, Issued Common stock, $0.0001 par value (200,000 shares authorized; 80,175 and 79,500 issued and outstanding, respectively) Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Accumulated other comprehensive income (loss), net 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 Goodwill and Long-lived Assets Goodwill and Intangible Assets Disclosure [Text Block] Disclosure Credit Facilities Additional Information [Abstract] Disclosure - Credit Facilities - Additional Information [Abstract] Line of Credit Facility [Table] Line of Credit Facility [Table] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility [Member] Revolving Credit Facility [Member] Letter of Credit [Member] Letter of Credit [Member] Lender Name [Axis] Lender Name [Axis] Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Wells Fargo [Member] Wells Fargo [Member] Wells Fargo [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Line of credit, available borrowings Line of Credit Facility, Maximum Borrowing Capacity Unrestricted Cash Deposit Unrestricted Cash Deposit Unrestricted cash deposit. Debt Instrument, Basis Spread on Variable Rate Debt Instrument, Basis Spread on Variable Rate Line of Credit Facility, Amount Outstanding Long-term Line of Credit Disclosure Summary Of Financial Assets Measured At Fair Value On Recurring Basis [Abstract] Disclosure - Summary of Financial Assets Measured at Fair Value on Recurring Basis [Abstract] Fair Value, Assets and Liabilities Measured on Recurring Basis [Table] Fair Value Assets And Liabilities Measured On Recurring Basis [Table] Fair Value, Assets and Liabilities Measured on Recurring Basis [Table] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Cash Equivalents Cash Equivalents [Member] Restricted Cash and Cash Equivalents, Cash and Cash Equivalents [Axis] Restricted Cash and Cash Equivalents [Axis] Restricted Cash and Cash Equivalents, Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Corporate bonds Corporate Bond Securities [Member] Money market funds Money Market Funds [Member] U.S. government Agency bonds Agency Bonds [Member] Agency Bonds [Member] Israeli Severance Funds Israeli Severance Funds [Member] Israeli Severance Funds [Member] Asset backed securities Agency discount notes [Member] Agency discount notes [Member] Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Investments Other assets Other Assets, Fair Value Disclosure Assets, Fair Value Disclosure Assets, Fair Value Disclosure Disclosure Change In Carrying Value Of Goodwill [Abstract] Disclosure - Change in Carrying Value of Goodwill [Abstract] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Business Segments [Axis] Segments [Axis] Segment [Domain] Segments [Domain] Clear Aligner [Member] Clear Aligner [Member] Clear Aligner [Member] Goodwill [Line Items] Goodwill [Line Items] Goodwill [Roll Forward] Goodwill [Roll Forward] Balance as of December 31, 2015 Adjustments Goodwill, Translation and Purchase Accounting Adjustments Balance as of March 31, 2016 Disclosure Intangible Assets As Direct Result From Cadent Acquisition [Abstract] Disclosure - Intangible Assets as Direct Result from Cadent Acquisition [Abstract] Schedule of Finite-Lived Intangible Assets by Major Class [Table] Schedule of Finite-Lived Intangible Assets [Table] Acquired Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Trademarks Trademarks [Member] Existing technology Existing Technology [Member] Existing Technology [Member] Customer relationships Customer Relationships [Member] Other Other Intangible Assets [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Weighted Average Amortization Period (in years) Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Gross Carrying Amount, beginning balance Finite-Lived Intangible Assets, Gross Accumulated Amortization Finite Lived Intangible Assets Accumulated Amortization Period Increase Decrease Finite-Lived Intangible Assets, Accumulated Amortization, Period Increase (Decrease) Accumulated Impairment Loss Finite-Lived Intangible Assets, Accumulated Impairment Loss Finite-Lived Intangible Assets, Accumulated Impairment Loss Net Carrying Value, ending balance Finite-Lived Intangible Assets, Net Schedule of Future Lease Payments Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Goodwill and Intangible Asset Impairment [Abstract] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Scanners and Services Scanners And Services [Member] Scanners and Services [Member] Disclosure Segments And Geographical Information Additional Information [Abstract] Disclosure - Segments and Geographical Information - Additional Information [Abstract] Number of reportable segments Number of Reportable Segments Basis of presentation Basis of Accounting, Policy [Policy Text Block] Use of estimates Use of Estimates, Policy [Policy Text Block] Recent Accounting Pronouncements Recent Accounting Pronouncements [Policy Text Block] Recent accounting pronouncements , Policy [Text Block] Disclosure Summary Of M S U Performance [Abstract] Disclosure - Summary of MSU Performance [Abstract] 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] Number of Shares Underlying MSUs Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Nonvested as of December 31, 2015 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 Vested and released Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Nonvested as of March 31, 2016 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 [Abstract] Nonvested as of December 31, 2015 Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Vested and released Sharebased Compensation Arrangement By Sharebased Payment Award Equity Instruments Other Than Options Vested And Released In Period Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options Vested And Released In Period Weighted Average Grant Date Fair Value Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Nonvested as of March 31, 2016 Weighted Average Remaining Vesting Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] Nonvested as of March 31, 2016 Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding Weighted Average Remaining Contractual Term 1 Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding Weighted Average Remaining Contractual Term 1 Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Abstract] Nonvested as of March 31, 2016 Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding Statement of Comprehensive Income [Abstract] Net income Net change in cumulative translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Change in unrealized gains (losses) on available-for-sale securities, net of tax Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Stock-based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Short-Term And Long-Term Marketable Securities Available-for-sale Securities [Table Text Block] Investments Classified by Contractual Maturity Date [Table Text Block] Investments Classified by Contractual Maturity Date [Table Text Block] Financial Assets Measured At Fair Value On Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Schedule of Notional Amounts of Outstanding Derivative Positions Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Disclosure Total Estimated Annual Future Amortization Expense For Acquired Intangible Assets [Abstract] Disclosure - Total Estimated Annual Future Amortization Expense for Acquired Intangible Assets [Abstract] Remainder of 2016 Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 2017 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2018 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2018 Finite-Lived Intangible Assets, Amortization Expense, Year Five Thereafter Future Amortization Expense Thereafter Future Amortization Expense, Thereafter Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] Schedule of Inventories Schedule of Inventory, Current [Table Text Block] Schedule of Accrued Liabilities Schedule of Accrued Liabilities [Table Text Block] Warranty Accrual Schedule of Product Warranty Liability [Table Text Block] Accounting for Income Taxes Income Tax Disclosure [Text Block] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Disclosure Common Stock Repurchase Program Additional Information [Abstract] Disclosure - Common Stock Repurchase Program - Additional Information [Abstract] Share Repurchases [Table] Share Repurchases [Table] Share Repurchases [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Domain] Share Repurchase Program [Domain] April 2014 Stock Repurchase Program April 2014 Stock Repurchase Program [Member] April 2014 Stock Repurchase Program [Member] Accelerated Share Repurchase Program Accelerated Share Repurchase Program [Member] Accelerated Share Repurchase Program [Member] April 2016 Repurchase April 2016 Repurchase [Member] April 2016 Repurchase [Member] Share Repurchases [Line Items] Share Repurchases [Line Items] Share Repurchases [Line Items] Repurchase of common stock, common stock authorized Stock Repurchase Program, Authorized Amount Stock repurchase program, period Stock Repurchase Program, Period in Force Remaining authorized amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Payments - accelerated share repurchase Accelerated Share Repurchases, Settlement (Payment) or Receipt Accelerated share repurchase (shares) Accelerated Share Repurchases, Shares Acquired Accelerated Share Repurchases, Shares Acquired Repurchase of stock Treasury Stock, Value, Acquired, Cost Method Common Stock Repurchase Share Repurchase Program Disclosure [Text Block] Share Repurchase Program Disclosure Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Expected term (in years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Expected 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 Expected dividends Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Weighted average fair value at grant date (USD per Share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Disclosure Accounting For Income Taxes Additional Information [Abstract] Disclosure - Accounting for Income Taxes - Additional Information [Abstract] Income Taxes [Table] Income Taxes [Table] Income Taxes [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Foreign Tax Authority [Member] Foreign Tax Authority [Member] Income Taxes [Line Items] Income Taxes [Line Items] Income Taxes [Line Items] Effective income tax rate, continuing operations Effective Income Tax Rate Reconciliation, Percent Statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Valuation allowance, deferred tax asset Deferred Tax Assets, Valuation Allowance Unrecognized tax benefits Unrecognized Tax Benefits Accrued interest Unrecognized Tax Benefits, Interest on Income Taxes Accrued Foreign income tax rate Effective Income Tax Reconciliation, at Foreign Income Tax Rate Effective Income Tax Reconciliation, at Foreign Income Tax Rate Tax Holiday effect Effective Income Tax Rate Reconciliation, Tax Holiday, Amount Tax holiday effect on diluted earnings per share Effective Income Tax Rate Reconciliation, Tax Holiday, Effect on Diluted Earnings Per Share Effective Income Tax Rate Reconciliation, Tax Holiday, Effect on Diluted Earnings Per Share Legal Proceedings [Abstract] Legal Proceedings [Abstract] Legal Proceedings Legal Proceedings [Text Block] Legal Proceedings [Text Block] Disclosure Stock Based Compensation Expense Related To All Stock Based Awards And Employee Stock Purchases [Abstract] Disclosure - Stock-Based Compensation Expense Related to All Stock-Based Awards and Employee Stock Purchases [Abstract] 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 [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis] Income Statement Location [Axis] Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain] Income Statement Location [Domain] Cost of net revenues Cost of Sales [Member] Selling, general and administrative Selling and Marketing Expense [Member] Research and development Research and Development Expense [Member] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] Stock-based compensation expense Allocated Share-based Compensation Expense Net Profit Per Share Earnings Per Share [Text Block] Marketable Securities and Fair Value Measurements Financial Instruments Disclosure [Text Block] Summary of Goodwill by Reportable Segment Schedule of Goodwill [Table Text Block] Schedule Of Amortized Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Schedule of Finite-Lived Intangible Assets, Future Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Disclosure Warranty Accrual Activity [Abstract] Disclosure - Warranty Accrual Activity [Abstract] Movement in Standard Product Warranty Accrual [Roll Forward] Movement in Standard Product Warranty Accrual [Roll Forward] Balance at beginning of period Standard Product Warranty Accrual Charged to cost of revenues Standard Product Warranty Accrual, Increase for Warranties Issued Actual warranty expenditures Standard Product Warranty Accrual, Decrease for Payments Balance at end of period Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Foreign Exchange Forward Foreign Exchange Forward [Member] Major Types of Debt and Equity Securities [Axis] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Maximum Maximum [Member] Maturity Period Used To Classify Investments Maturity Period Used To Classify Investments Maturity Period Used to Classify Investments Gain Derivative, Gain (Loss) on Derivative, Net Disclosure Segment Information [Abstract] Disclosure - Segment Information [Abstract] Scanner Revenue Gross profit Accounts receivable, allowance for doubtful accounts and returns Allowance For Doubtful Accounts Receivable And Sales Returns Current Allowance For Doubtful Accounts Receivable And Sales Returns Current Preferred stock, par value (in usd per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred stock, shares issued Preferred Stock, Shares Issued Common stock, par value (in usd per share) 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 Credit Facilities Debt Disclosure [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 profit to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Deferred taxes Deferred Income Tax Expense (Benefit) Depreciation and amortization Depreciation, Depletion and Amortization Stock-based compensation Share-based Compensation Tax (shortfalls) benefits from stock-based awards Tax Benefits Shortfalls From Stock Based Awards Tax Benefits Shortfalls From Stock Based Awards Excess tax benefit from share-based payment arrangements Excess Tax Benefit from Share-based Compensation, Operating Activities Other non-cash operating activities Other Noncash Income (Expense) Changes in assets and liabilities, net of acquired 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 Accrued and other long-term liabilities Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Deferred revenues Increase (Decrease) in Deferred Revenue 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 property, plant and equipment Payments to Acquire Property, Plant, and Equipment Purchase of marketable securities Payments to Acquire Available-for-sale Securities Proceeds from maturities of marketable securities Proceeds from Sale and Maturity of Available-for-sale Securities Proceeds from sales of marketable securities Proceeds from Sale of Available-for-sale Securities Other investing activities Payments for (Proceeds from) Other Investing Activities 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 Issuance of Common Stock Common stock repurchases Payments for Repurchase of Common Stock Excess tax benefit from share-based payment arrangements Excess Tax Benefit from Share-based Compensation, Financing Activities Employees’ taxes paid upon the vesting of restricted stock units Payments Related to Tax Withholding for Share-based Compensation Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Effect of foreign exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash and Cash Equivalents Net decrease in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents, beginning of the period Cash and cash equivalents, end of the period Derivative [Table] Derivative [Table] Currency [Axis] Currency [Axis] All Currencies [Domain] All Currencies [Domain] US dollar United States of America, Dollars Euro Euro Member Countries, Euro Japanese yen Japan, Yen Australian dollar Australia, Dollars Hong Kong dollar Hong Kong, Dollars Fair Value Hierarchy [Domain] Prepaid Expenses and Other Current Assets Prepaid Expenses and Other Current Assets [Member] Derivative [Line Items] Derivative [Line Items] Notional amount Derivative Asset, Notional Amount Balance Sheet Components Supplemental Balance Sheet Disclosures [Text Block] Disclosure Stockbased Compensation Additional Information [Abstract] Disclosure - Stock-based Compensation - Additional Information [Abstract] Employee Stock Purchase Plan 2010 Employee Stock Purchase Plan 2010 [Member] Employee Stock Purchase Plan, 2010 [Member] Employee Stock Purchase Plan Employee Stock Purchase Plan [Member] Employee Stock Purchase Plan [Member] Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Axis] Schedule Of Share Based Compensation Arrangement By Share Based Payment Award [Axis] Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Axis] Share-based Compensation Arrangements by Share-based Payment Award [Domain] Share Based Compensation Arrangements By Share Based Payment Award [Domain] Share-based Compensation Arrangements by Share-based Payment Award [Domain] Incentive Plan 2005 Stock Incentive Plan 2005 [Member] 2005 Stock Incentive Plan [Member] Minimum Minimum [Member] Shares reserved for issuance Common Stock, Capital Shares Reserved for Future Issuance Number of shares available for issuance Common Stock, Capital Shares Reserved For Future Issuance, Shares Available Common Stock, Capital Shares Reserved For Future Issuance, Shares Available Total unamortized compensation cost Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Weighted average period of total unamortized cost (in years) Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Vesting period of granted market-performance based restricted stock units Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Percentage of market-performance based restricted stock units eligible to vest over the vesting period Percentage Of Market Performance Based Restricted Stock Units During Vesting Period Maximum percentage of market-performance based restricted stock units during vesting period. Maximum number of shares available Employee Stock Purchase Plan Number Of Shares Available For Issuance Employee Stock Purchase Plan, Number Of Shares Available for Issuance Number of shares remaining Share Based Compensation Arrangement By Share Based Payment Award Shares Remaining Available For Issuance Share Based Compensation Arrangement By Share Based Payment Award Shares Remaining Available For Issuance Disclosure Activity Under Stock Option Plans [Abstract] Disclosure - Activity Under Stock Option Plans [Abstract] Number of Shares Underlying Stock Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Outstanding as of December 31, 2015 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Cancelled or expired Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Outstanding as of March 31, 2016 Vested and expected to vest at March 31, 2016 Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Exercisable at March 31, 2016 Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Weighted Average Exercise Price per Share Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Outstanding as of December 31, 2015 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Exercised Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Cancelled or expired Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Outstanding as of March 31, 2016 Vested and expected to vest at March 31, 2016 (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Exercisable at March 31, 2016 (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Weighted Average Remaining Contractual Term Share Based Compensation Arrangement By Share Based Payment Award Options Weighted Average Remaining Contractual Term [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Term [Abstract] Outstanding as of March 31, 2016 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Vested and expected to vest at March 31, 2016 Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Exercisable at March 31, 2016 Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Aggregate Intrinsic Value Share Based Compensation Arrangement By Share Based Payment Award Options Aggregate Intrinsic Value [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Aggregate Intrinsic Value [Abstract] Outstanding as of March 31, 2016 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Vested and expected to vest at March 31, 2016 Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Exercisable at March 31, 2016 Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Disclosure Minimum Future Lease Payments For Non Cancelable Leases [Abstract] Disclosure - Minimum Future Lease Payments for Non-Cancelable Leases [Abstract] Remainder of 2016 Operating Leases Future Minimum Payments Due Remainder Of Period Operating Leases, Future Minimum Payments Due, Remainder of Period 2017 Operating Leases, Future Minimum Payments, Due in Two Years 2018 Operating Leases, Future Minimum Payments, Due in Three Years 2019 Operating Leases, Future Minimum Payments, Due in Four Years 2020 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total minimum lease payments Operating Leases, Future Minimum Payments Due Disclosure Summary Of Nonvested Shares [Abstract] Disclosure - Summary of Nonvested Shares [Abstract] Number of Shares Underlying RSUs Weighted Remaining Vesting Period