Accrued litigation settlements Increase (Decrease) in Accrued Litigation Settlements The net change during the reporting period in the aggregate amount of ligation settlements. REVENUE RECOGNITION REVENUE RECOGNITION Revenue Recognition [Text Block] This element represents the principles adopted by the entity for recognition of revenue for various products and services. PROPOSED ACQUISITION OF NETWORK EQUIPMENT TECHNOLOGIES, INC. Proposed Business Combination Disclosure [Text Block] PROPOSED ACQUISITION OF NETWORK EQUIPMENT TECHNOLOGIES, INC. The entire disclosure for proposed acquisition approved by board of directors. Document and Entity Information Award Type [Axis] Adjustments to Additional Paid in Capital, Forfeited Stock Options, Requisite Service Period Recognition Settlement payment for forfeited stock options Represents the amount of recognized forfeited stock options during the period. CANCELLATION AND RETIREMENT OF TREASURY STOCK Deferred Costs of Goods Sold, Net of Reserves Deferred cost of goods sold Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of deferred costs of goods sold. Schedule of Components of Foreign Currency Gains (Losses) [Table Text Block] Schedule of components of foreign currency gains (losses) Tabular disclosure of the components of foreign currency gains or losses. Amendment Description Foreign Currency Remeasurement Gains (Losses) Remeasurement gains (losses) Represents the gains or losses arising on account of changes in foreign exchange rate used to remeasure amounts denominated in a currency other than the functional currency into the functional currency. Amendment Flag Foreign Currency Gains (Losses) Foreign currency gains (losses), total Represents the total gains or losses related to foreign currency. Qwest Communications International Inc [Member] Qwest Communications International, Inc. Represents Qwest Communications International, Inc., a major customer of the entity. Bahamas Telecommunications Company Limited [Member] Bahamas Telecom Represents Bahamas Telecommunications Company Ltd. (Bahamas Telecom), a major customer of the entity. Investment [Axis] AT and T Inc. [Member] AT&T Represents AT&T Inc., a major customer of the entity. Investment [Domain] Network Equipment Technologies Inc [Member] NET Represents information pertaining to Network Equipment Technologies, Inc. Business Acquisition Cost of Acquired Entity Purchase Price Excluding Acquisition Related Costs Purchase price excluding acquisition-related costs Cost of the acquired entity, including the cash paid to shareholders of the acquired entity, fair value of debt and equity securities issued to shareholders of the acquired entity, the fair value of the liabilities assumed, but excluding acquisition-related costs. Other Geographical Area [Member] Other A group of other countries not separately specified, about which segment information is provided by the entity. Number of Major Customers Number of major customers Represents the number of major customers of the entity. Schedule of Finite Lived Intangible Assets Amortization Expense [Table Text Block] Schedule of amortization expense related to intangible assets Tabular disclosure of amortization expense related to finite lived intangible assets. Schedule of Cash Equivalents, Marketable Securities and Investments Reconciliation [Table Text Block] Schedule of amortized cost, gross unrealized gains and losses and fair value of marketable debt and equity securities and investments Tabular disclosure of the reconciliation of cash equivalents, marketable securities and investments from cost basis to fair value. Cash Equivalents Amortized Cost Cash equivalents, amortized cost Represents the amortized cost of cash equivalents. Marketable Securities Gross Unrealized Losses Marketable securities, unrealized losses This item represents the gross unrealized losses for securities, at a point in time, which are categorized as marketable securities. Marketable Securities Amortized Cost Marketable securities, amortized cost This item represents the cost of debt and equity securities, which are categorized as marketable securities, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. Marketable Securities Gross Unrealized Gains Marketable securities, unrealized gains This item represents the gross unrealized gains for securities, at a point in time, which are categorized as marketable securities. Long term Investments Amortized Cost Investments, amortized cost This item represents the cost of debt and equity securities, which are categorized as long-term investments, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. Long term Investments Gross Unrealized Gains Investments, unrealized gains This item represents the gross unrealized gains for securities, at a point in time, which are categorized as long-term investments. Current Fiscal Year End Date This item represents the gross unrealized losses for securities, at a point in time, which are categorized as long-term investments. Long term Investments Gross Unrealized Losses Investments, unrealized losses Available for sale Securities Debt Maturity Period Considered to Classify as Investments Period considered to classify available-for-sale securities as investments Represents the period considered to classify available-for-sale debt securities as investments. Schedule of activity related to restricted stock grants Tabular disclosure of the number and weighted-average grant date fair value of restricted stock that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. Schedule of Share-based Compensation Restricted Stock Activity [Table Text Block] Schedule of activity related to performance stock awards Tabular disclosure of the number and weighted-average grant date fair value of performance stock awards that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. Schedule of Share based Compensation Performance Stock Awards Activity [Table Text Block] Product Cost of Sales [Member] Product cost of revenue Represents the primary financial statement caption in which reported facts about product cost of sales have been included. Service Cost of Sales [Member] Service cost of revenue Represents the primary financial statement caption in which reported facts about service cost of sales have been included. Share based Compensation Arrangement by Share based Payment Award, Equity Instruments Other than Options Nonvested, Number of Shares for which Performance Conditions Not Yet Established Stock awards not included in activity as the company has not yet established the performance conditions (in shares) Represents the stock awards that are not included in the activity because the entity has not yet established the performance conditions. Threshold percentage Threshold percentage which the entity uses for disclosure. Threshold for Disclosure, Percentage The aggregate expense recognized in the current period that allocates the cost of tangible assets to periods that benefit from use of the assets. Depreciation and amortization of property and equipment Depreciation and Amortization of Tangible Assets Inventory Finished Goods and Deferred Cost of Goods Sold Gross inventory The aggregated amount of merchandise or goods held by the entity and readily available for future sale and deferred cost of goods sold. Deferred cost of goods sold includes inventory at the customer site and third party costs. This amount is net of valuation reserves and adjustments. Violations of Federal Securities Laws [Member] 2001 IPO Litigation Represents the information pertaining to violations of the federal securities laws in connection with the entity's initial public offering. Document Period End Date Loss Contingencies Number of Officers Against Whom Case Was Filed Number of officers against whom a case was filed Represents the number of officers against whom a case was filed by the purchaser of the entity's common stock. Loss Contingencies Number of Other Publicly Traded Companies Against Which Similar Class Action Cases Were Filed by Other Plaintiffs Number of other publicly traded companies against which similar class action cases were filed by other plaintiffs Represents the number of other publicly traded companies against which similar class action cases were filed by other plaintiffs. Represents the period considered to classify available-for-sale debt securities as marketable securities. Available For Sale Securities Debt Maturity Period Considered to Classify as Marketable Securities Period considered to classify available-for-sale securities as marketable securities Schedule of Components of Acquisition Related Costs [Table Text Block] Schedule of components of acquisition-related costs included in results of operations Tabular disclosure of components of acquisition-related costs included in results of operations. Business Acquisition Accrued Restructuring Related to Employee Severance Costs Unpaid The unpaid amount, as of the balance sheet date, for accrued restructuring related to employee severance costs. The unpaid amount, as of the balance sheet date, for accrued restructuring related to employee severance costs. Unpaid amount of accrued restructuring related to employee severance costs Convertible Senior Notes 3.75 Percent [Member] 2007 Notes Represents the information pertaining to Convertible Senior Notes, bearing interest rate of 3.75 percent. Redeemable Convertible Subordinated Debentures 7.25 Percent [Member] 1989 Debentures Represents the information pertaining to Redeemable Convertible Subordinated Debentures, bearing interest rate of 7.25 percent. Debt Instrument Redemption Price Due to Change of Control as Percentage of Principal Amount Percentage of principal amount at which notes may be required to be repurchased in event of fundamental change Represents the redemption price as a percentage of the principal amount at which the debt instrument may be required to be redeemed in the event of a change of control. Debt Instrument Fundamental Change Period Notice Maximum Number of Business Days After Closing Date of Acquisition Maximum number of business days after the closing date of the acquisition, within which the entity delivered a fundamental change notice Represents the maximum number of business days after the closing date of the acquisition, within which the entity would deliver, or cause to be delivered, a fundamental change notice to each holder of debt instruments. Debt Instrument Repurchase Period Maximum Number of Business Days After Date of Fundamental Change Notice Maximum number of business days after the date of the fundamental change notice within which debt should be repurchased Represents the maximum number of business days after the date of the fundamental change notice within which the debt should be repurchased. Debt Instrument Sinking Fund Number of Annual Payments Number of annual payments under sinking fund Represents the number of annual payments under the sinking fund. Debt Instrument Sinking Fund Annual Payment as Percentage of Aggregate Principal Amount of Debt Issued Annual payment to sinking fund as a percentage of aggregate principal amount of debt issued Represents the annual payment to the sinking fund as a percentage of the aggregate principal amount of debt issued. Debt Instrument Sinking Fund Remaining Requirement at Acquisition Date Total remaining sinking fund requirement at the acquisition date Represents the total remaining sinking fund requirement at the acquisition date. Sonus Equity Awards [Member] Converted awards Represents the information pertaining to Sonus equity awards which are issued to convert shares granted to employees of acquired entity. Share Based Compensation Arrangement by Share Based Payment Award Maximum Level of Achievement as Percentage of Base Salary Maximum level of achievement as a percentage of base salary Represents the maximum level of achievement as a percentage of base salary for calculating number of bonus shares. Share Based Compensation Arrangement by Share Based Payment Award Options Outstanding of Acquired Entity Converted Into Entity Options in Period NET outstanding options converted to Sonus options (in shares) The number of shares under options of acquired entity that were converted into entity's options. Share Based Compensation Arrangements by Share Based Payment Award Options Outstanding of Acquired Entity Converted into Entity Options in Period Weighted Average Exercise Price NET outstanding options converted to Sonus options (in dollars per share) Weighted average price at which shares under options of acquired entity that were converted into entity's options. Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other than Options Nonvested of Acquired Entity Converted to Entity Equity Instruments Other than Options in Period Unvested NET RSUs converted to Sonus RSUs (in shares) The number of equity-based payment instruments, excluding stock (or unit) options of acquired entity that were converted into entity's equity-based payment instruments. Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other than Options of Acquired Entity Converted to Entity Equity Instruments Other than Options in Period Weighted Average Grant Date Fair Value Unvested NET RSUs converted to Sonus RSUs (in dollars per share) Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans of acquired entity that were converted into entity's equity-based payment instruments. Number of Consecutive Trading Days Used to Calculate Conversion Price of Shares Number of consecutive trading days used to calculate conversion price of shares Represents the number of consecutive trading days used to calculate conversion price of shares. Intellectual Property [Member] Intellectual Property Represents the details pertaining to intellectual property. Number of Periods Number of periods Represents the number of periods. Maximum Period to Measure Value of Assets Acquired and Liabilities Assumed Maximum measurement period from the acquisition date within which company records adjustments to the assets acquired and liabilities assumed Represents the maximum period from the acquisition date to measure value of assets acquired and liabilities assumed at the acquisition date. Period Over which Goodwill will be Deductible for Tax Purposes Period over which goodwill will be deductible for tax purpose Represents the period over which goodwill will be deductible for tax purpose. Business Acquisition Purchase Price Allocation Longterm Investment Noncurrent investments The amount of acquisition cost of a business combination allocated to long-term investments. Primary financial statement caption in which reported facts about professional and services fees, not otherwise specified, have been included. Professional and Services Fees [Member] Professional and services fees Change of Control Agreements [Member] Change of control agreements Primary financial statement caption in which reported facts about change of control agreements, not otherwise specified, have been included. Conversion Ratio to Convert Number of Shares Available for Grant of Acquire into Entities Equity Award Conversion factor used to convert a number of shares available for grant into the entity's equity awards Represents the conversion factor in the form of a ratio to used convert a number of shares available for grant into the entity's equity awards. Level 3 Communications [Member] Level 3 Communications Represents Level 3 Communications, a major customer of the entity. BASIS OF PRESENTATION Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Public Float Entity Registrant Name Entity Central Index Key Entity Common Stock, Shares Outstanding Accounts Payable and Accrued Liabilities Disclosure [Text Block] ACCRUED EXPENSES JAPAN Japan Document Fiscal Year Focus Document Fiscal Period Focus Document Type Accounts Receivable, Net, Current Accounts receivable, net of allowance for doubtful accounts of $0 at September 28, 2012 and December 31, 2011 Accounts Payable, Current Accounts payable Accounts Receivable [Member] Accounts receivable balance UNITED STATES United States Accrued Liabilities, Current Accrued expenses Total Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) [Member] Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Useful lives Identifiable intangible assets Acquired Finite-Lived Intangible Assets [Line Items] Additional paid-in capital Additional Paid in Capital, Common Stock Additional Paid-in Capital Additional Paid-in Capital [Member] Adjustments to reconcile net loss to cash flows used in operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Stock-based compensation expense Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Adjustments Related to Tax Withholding for Share-based Compensation Payment of tax withholding obligations related to net share settlements of restricted stock awards Allocated Share-based Compensation Expense Stock-based compensation (in dollars) Allowance for Doubtful Accounts Receivable, Current Accounts receivable, allowance for doubtful accounts (in dollars) Amortization of Intangible Assets Amortization of intangible assets Amortization expense Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Common stock and unvested shares of restricted stock not included because their effect would have been antidilutive (in shares) Asset-backed securities Asset-backed Securities [Member] Assets, Current [Abstract] Current assets: Assets [Abstract] Assets Assets, Current Total current assets Assets Total assets Basis of Accounting, Policy [Policy Text Block] Basis of Presentation Business Acquisition, Pro Forma Earnings Per Share, Basic Loss per share (in dollars per share) Marketable securities Business Acquisition, Purchase Price Allocation, Current Assets, Marketable Securities Other current assets Business Acquisition, Purchase Price Allocation, Current Assets, Prepaid Expense and Other Assets Business Acquisition [Axis] Business Acquisition, Cost of Acquired Entity, Cash Paid Cash consideration Business Acquisition, Purchase Price Allocation, Current Assets Current assets Business Acquisition, Pro Forma Information [Abstract] Unaudited pro forma results of operations Business Acquisition, Contingent Consideration, at Fair Value Fair value of contingent consideration Business Acquisition, Purchase Price Allocation, Goodwill Amount Goodwill Business Acquisition, Pro Forma Revenue Revenue Business Acquisition, Acquiree [Domain] Business Acquisition, Cost of Acquired Entity, Purchase Price [Abstract] Fair value of consideration transferred: Schedule of unaudited pro forma results of operations Business Acquisition, Pro Forma Information [Table Text Block] Business Acquisition, Purchase Price Allocation [Abstract] Allocation of the purchase consideration: Business Acquisition, Purchase Price Allocation, Current Assets, Cash and Cash Equivalents Cash Business Acquisition, Pro Forma Net Income (Loss) Loss per share Acquisition consideration per share (in dollars per share) Business Acquisition, Share Price Cash consideration per share of the acquired entity (in dollars per share) ACQUISITION OF NET Business Acquisition, Purchase Price Allocation, Current Liabilities Current liabilities Business Acquisition, Purchase Price Allocation, Intangible Assets Other than Goodwill Intangible assets Deferred income taxes Business Acquisition, Purchase Price Allocation, Deferred Taxes Asset (Liability), Net, Noncurrent Business Acquisition, Cost of Acquired Entity, Transaction Costs Acquisition-related costs Business Acquisition, Cost of Acquired Entity [Abstract] Acquisition-Related Costs PROPOSED ACQUISITION OF NETWORK EQUIPMENT TECHNOLOGIES, INC. Business Acquisition [Line Items] Acquisition Of Net Business Acquisition, Cost of Acquired Entity, Purchase Price Fair value of total consideration Business Acquisition, Purchase Price Allocation, Notes Payable and Long-term Debt Debt Other non-current assets Business Acquisition, Purchase Price Allocation, Other Noncurrent Assets Property and equipment Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual Revenue ACQUISITION OF NET Business Combination Disclosure [Text Block] Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual Net loss Business Acquisition, Purchase Price Allocation, Other Noncurrent Liabilities Other long-term liabilities Business Combinations Business Combinations Policy [Policy Text Block] Acquisition-related costs Business Combination, Acquisition Related Costs Acquisition-related expenses Acquisition-related Capital Lease Obligations Incurred Property and equipment acquired under operating lease Capital Expenditures Incurred but Not yet Paid Capital expenditures incurred, but not yet paid Cash Equivalents, at Carrying Value Cash equivalents, fair value Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Cash and cash equivalents, beginning of year Cash and cash equivalents, end of period Supplemental disclosure of non-cash investing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Certificates of Deposit [Member] Certificates of deposit Commercial Paper [Member] Commercial paper Commitments and Contingencies Disclosure [Text Block] COMMITMENTS AND CONTINGENCIES COMMITMENTS AND CONTINGENCIES Commitments and contingencies (Note 15) Commitments and Contingencies. Common Stock Common Stock [Member] Common stock, shares outstanding Common Stock, Shares, Outstanding Balance (in shares) Balance (in shares) Common stock, $0.001 par value; 600,000,000 shares authorized; 280,524,050 shares issued and outstanding at September 28, 2012 and 279,318,396 shares issued and outstanding at December 31, 2011 Common Stock, Value, Issued Common stock, shares issued Common Stock, Shares, Issued Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized EMPLOYEE DEFINED CONTRIBUTION PLAN COMPREHENSIVE INCOME (LOSS) Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive Income (Loss) Note [Text Block] COMPREHENSIVE INCOME (LOSS) Comprehensive Loss Comprehensive Income [Member] Internal use software Computer Software, Intangible Asset [Member] Concentration Risk Type [Domain] Concentration Risk [Line Items] Revenue by geographic area and by customer MAJOR CUSTOMERS Concentration Risk Benchmark [Domain] Concentration Risk [Table] Concentration Risk Benchmark [Axis] Concentration Risk Disclosure [Text Block] MAJOR CUSTOMERS Concentration Risk Type [Axis] Concentration Risk, Percentage Percentage of total revenue Concentration risk, percentage Consolidation, Policy [Policy Text Block] Principles of Consolidation Current portion of convertible subordinated note Convertible Subordinated Debt, Current Long-term portion of convertible subordinated note Convertible Subordinated Debt, Noncurrent Aggregate principal amounts remaining outstanding Amount of debt assumed and outstanding at the acquisition date Convertible Subordinated Debt Corporate Debt Securities [Member] Corporate debt securities Cost of revenue: Cost of Revenue [Abstract] Product Cost of Goods Sold Total cost of revenue Cost of Revenue Service Cost of Services Customer Concentration Risk [Member] Customer Customer Relationships [Member] Customer relationships Repurchase of aggregate principal amounts Debt Instrument, Repurchase Amount Debt Instrument [Line Items] DEBT Schedule of Long-term Debt Instruments [Table] LONG-TERM LIABILITIES Debt and Capital Leases Disclosures [Text Block] DEBT Debt Disclosure [Text Block] DEBT Debt Instrument, Convertible, Conversion Price Conversion price (in dollars per share) Debt Instrument, Sinking Fund Payment Annual payment to sinking fund Debt Instrument, Convertible, Conversion Ratio Conversion rate, number of shares to be issued per $1000 principal amount Debt Instrument, Increase, Additional Borrowings Amount of debt issued Debt Instrument, Interest Rate, Stated Percentage Interest rate Title of Individual [Axis] Deferred income taxes Deferred Income Tax Expense (Benefit) Deferred Tax Assets, Net of Valuation Allowance, Current Deferred income taxes Deferred revenue Deferred Revenue, Noncurrent Current portion of deferred revenue Deferred Revenue, Current Deferred income taxes Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Developed Technology Rights [Member] Intellectual property Developed technology Disclosure of Compensation Related Costs, Share-based Payments [Text Block] STOCK-BASED COMPENSATION PLANS STOCK-BASED COMPENSATION PLANS Diluted (in dollars per share) Earnings Per Share, Diluted Net loss per share (in dollars per share) Earnings Per Share, Basic [Member] Basic (in dollars per share) Earnings Per Share, Basic Earnings Per Share [Text Block] EARNINGS (LOSS) PER SHARE Earnings (loss) per share: EARNINGS (LOSS) PER SHARE Effect of Exchange Rate on Cash and Cash Equivalents, Continuing Operations Effect of exchange rate changes on cash and cash equivalents Employee-related Liabilities, Current Employee compensation and related costs Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition Weighted average period to record stock-based compensation expenses Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain] Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized Fair value of the assumed awards attributable to future stock-based compensation expense Employee Severance [Member] Employee severance Equity Component [Domain] Estimate of Fair Value, Fair Value Disclosure [Member] Total carrying value Facilities Facility Closing [Member] Fair Value, Hierarchy [Axis] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block] Schedule of fair value of financial assets Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Cash and cash equivalents, Marketable securities and Investments Fair Value of Financial Instruments, Policy [Policy Text Block] Fair Value of Financial Instruments Fair Value, Inputs, Level 3 [Member] Significant unobservable inputs (Level 3) Fair Value, Inputs, Level 1 [Member] Quoted prices in active markets (Level 1) Fair Value, Inputs, Level 2 [Member] Significant other observable inputs (Level 2) Financial Instruments Disclosure [Text Block] CASH EQUIVALENTS, MARKETABLE SECURITIES AND LONG-TERM INVESTMENTS Finite-Lived Intangible Asset, Useful Life Weighted average amortization period (years) Finite-Lived Intangible Assets, Major Class Name [Domain] 2017 Finite-Lived Intangible Assets, Amortization Expense, Year Five Finite-Lived Intangible Assets, Gross Cost Finite-Lived Intangible Assets [Line Items] Intangible Assets And Goodwill 2015 Finite-Lived Intangible Assets, Amortization Expense, Year Three Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Estimated future amortization expense for intangible assets Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Accumulated Amortization Accumulated amortization Thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 2013 2016 Finite-Lived Intangible Assets, Amortization Expense, Year Four Finite-Lived Intangible Assets, Amortization Expense, Year Two 2014 Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year Remainder of 2012 Finite-Lived Intangible Assets, Net Total Foreign Government Debt Securities [Member] Foreign government notes FOREIGN CURRENCY TRANSLATION Foreign Currency Transaction Gain (Loss), before Tax Transaction gains (losses) Foreign Currency Disclosure [Text Block] FOREIGN CURRENCY TRANSLATION Gain (Loss) on Sale of Property Plant Equipment Loss on disposal of property and equipment General and administrative General and Administrative Expense General and Administrative Expense [Member] General and administrative Geographic Concentration Risk [Member] Geographical area Goodwill Goodwill Goodwill at the beginning of the period Goodwill at the end of the period Goodwill, Impaired, Accumulated Impairment Loss [Abstract] Changes in goodwill Goodwill, Gross Goodwill Goodwill and Intangible Assets Disclosure [Text Block] INTANGIBLE ASSETS AND GOODWILL Acquisition of NET Goodwill, Acquired During Period INTANGIBLE ASSETS AND GOODWILL Increase to NET goodwill Goodwill, Period Increase (Decrease) Goodwill, Impaired, Accumulated Impairment Loss Accumulated impairment losses Gross profit Gross Profit Condensed Consolidated Statements of Operations Income Statement Location [Axis] Income Tax Disclosure [Text Block] INCOME TAXES INCOME TAXES Income (loss) before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income Statement Location [Domain] Income tax (provision) benefit Income Tax Expense (Benefit) Income Taxes Paid Income taxes paid Accounts payable Increase (Decrease) in Accounts Payable Accrued expenses and other long-term liabilities Increase (Decrease) in Accrued Liabilities Deferred revenue Increase (Decrease) in Deferred Revenue Increase (Decrease) in Accounts Receivable Accounts receivable Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Increase (Decrease) in Other Operating Assets Other operating assets Increase (Decrease) in Inventories Inventory Increase in restricted cash Increase (Decrease) in Restricted Cash Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Intangible Assets, Net (Excluding Goodwill) Intangible assets, net Net carrying value Interest Expense Interest expense Interest income, net Interest Income (Expense), Nonoperating, Net Interest Paid Interest paid Inventory, Finished Goods, Net of Reserves On-hand final assemblies and finished goods inventories Inventory Disclosure [Text Block] INVENTORY Inventory, Noncurrent Noncurrent portion (included in Other assets) Inventory, Net Inventory Less current portion INVENTORY Investment Holdings [Line Items] Amortized cost, gross unrealized gains and losses and fair value of marketable debt and equity securities and investments Investment Holdings [Table] CASH EQUIVALENTS, MARKETABLE SECURITIES AND LONG-TERM INVESTMENTS Long-term Debt, Type [Domain] Long-term Debt, Type [Axis] Total current liabilities Liabilities, Current Liabilities, Current [Abstract] Current liabilities: Total liabilities Liabilities Liabilities and Equity [Abstract] Liabilities and stockholders' equity Total liabilities and stockholders' equity Liabilities and Equity ACCOUNTS RECEIVABLE, NET Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Long-term Debt Outstanding amount Long-term Investments Investments Investments, fair value Investments, fair value Loss Contingencies [Table] Loss Contingency Nature [Axis] COMMITMENTS AND CONTINGENCIES Loss Contingencies [Line Items] Loss Contingency, Nature [Domain] Major Customers [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Management [Member] Raymond P. Dolan, President and Chief Executive Officer Marketable Securities, Current Marketable securities Marketable securities, fair value Marketable securities, fair value Maximum [Member] Maximum Less than Minimum [Member] Minimum Name of Major Customer [Domain] Nature of Operations [Text Block] NATURE OF THE BUSINESS Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Net cash used in operating activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Cash flows from operating activities: Net Cash Provided by (Used in) Continuing Operations Net (decrease) increase in cash and cash equivalents Net Cash Provided by (Used in) Investing Activities, Continuing Operations Net cash provided by investing activities Net income (loss) Net Income (Loss) Available to Common Stockholders, Basic Net income (loss) Net loss Net loss Net Income [Member] Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net cash (used in) provided by financing activities Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] New Accounting Pronouncements, Policy [Policy Text Block] Recent Accounting Pronouncements Supplemental disclosure of non-cash financing activities: Noncash Investing and Financing Items [Abstract] Number of Reportable Segments Number of reportable operating segments Operating expenses: Operating Expenses [Abstract] Total operating expenses Operating Expenses Income (loss) from operations Operating Income (Loss) Order or Production Backlog [Member] Order backlog NATURE OF THE BUSINESS Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] BASIS OF PRESENTATION Other Assets, Current Other current assets Other Assets, Noncurrent Other assets Current portion of other long-term liabilities Other Liabilities, Current Other expense, net Other Nonoperating Income (Expense) Other long-term liabilities Other Liabilities, Noncurrent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Other comprehensive income (loss), net of tax: Other Accrued Liabilities, Current Other Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Total Other comprehensive income (loss) Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Foreign currency translation adjustments Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Unrealized gain (loss) on available-for-sale marketable securities, net of tax ACCRUED EXPENSES Payments to Acquire Property, Plant, and Equipment Purchases of property and equipment Business acquisition, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Cash, net of cash acquired Payments to Acquire Intangible Assets Purchase of intangible assets Payments to Acquire Marketable Securities Purchases of marketable securities EMPLOYEE DEFINED CONTRIBUTION PLAN Pension and Other Postretirement Benefits Disclosure [Text Block] Performance Shares [Member] Performance share awards Preferred stock, $0.01 par value; 5,000,000 shares authorized, none issued and outstanding Preferred Stock, Value, Issued Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred stock, shares issued Preferred Stock, Shares Issued Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Excluding Stock Options Proceeds from sale of common stock in connection with employee stock purchase plan Proceeds from Income Tax Refunds Income tax refunds received Proceeds from Sale and Maturity of Marketable Securities Sale/maturities of marketable securities Proceeds from Stock Options Exercised Proceeds from exercise of stock options Cash received from the exercise of stock options (in dollars) PROPERTY AND EQUIPMENT Property, Plant and Equipment, Net Property and equipment, net Property, Plant and Equipment Disclosure [Text Block] PROPERTY AND EQUIPMENT Quarterly Financial Information [Text Block] QUARTERLY RESULTS (UNAUDITED) QUARTERLY RESULTS (UNAUDITED) Range [Axis] Range [Domain] ACCOUNTS RECEIVABLE, NET Related Party Transactions Disclosure [Text Block] RELATED PARTIES RELATED PARTIES Settlement of redeemable convertible subordinated debentures Payment of aggregate principal amount of debentures Repayments of Subordinated Debt Repayments of Long-term Capital Lease Obligations Principal payments of capital lease obligations Repayments of Convertible Debt Amount paid to settle all notes tendered for purchase Research and development Research and Development Expense Research and Development Expense [Member] Research and development Restricted Stock, Shares Issued Net of Shares for Tax Withholdings Shares of restricted stock returned to the Company under net share settlements to satisfy tax withholding obligations (in shares) Restricted Stock [Member] Restricted stock awards Restricted Stock, Value, Shares Issued Net of Tax Withholdings Shares of restricted stock returned to the Company under net share settlements to satisfy tax withholding obligations Restructuring Reserve [Abstract] Restructuring accrual activity Restructuring and Related Cost, Number of Positions Eliminated, Period Percent Reduction in workforce (as a percent) Restructuring charge Restructuring and Related Cost, Expected Cost RESTRUCTURING ACCRUAL Restructuring and Related Activities Disclosure [Text Block] Restructuring and Related Cost, Number of Positions Eliminated Reduction in workforce, number Restructuring Type [Axis] Restructuring Restructuring Charges Initiatives charged to expense Number of workforce reduction Restructuring and Related Cost, Expected Number of Positions Eliminated Restructuring Reserve, Settled with Cash Cash payments RESTRUCTURING ACCRUAL Restructuring Reserve, Translation Adjustment Foreign exchange Restructuring Cost and Reserve [Line Items] RESTRUCTURING ACCRUAL Restructuring Reserve Balance at the end of the period Accumulated deficit Retained Earnings (Accumulated Deficit) Accumulated Deficit Retained Earnings [Member] Total revenue Revenues Revenue: Revenues [Abstract] MAJOR CUSTOMERS Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Vested or expected to vest at the end of the period Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Expected life Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term Exercisable at the end of the period Outstanding at the end of the period Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Schedule of estimated future amortization expense for intangible assets Product Sales Revenue, Goods, Net Revenue Sales [Member] Service Sales Revenue, Services, Net Scenario, Unspecified [Domain] Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] Summary of revenue by geographic area as a percentage of total revenue Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of activity related to outstanding stock options Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value [Table Text Block] Schedule of additional information regarding stock options Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] Schedule of customers contributing 10% or more of the revenue Schedule of assumptions used to estimate the fair value of options at the date of grant using the Black-Scholes option pricing model Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of Inventory, Current [Table Text Block] Schedule of inventory Schedule of Accrued Liabilities [Table Text Block] Schedule of accrued expenses Schedule of Finite-Lived Intangible Assets [Table] Summary of preliminary allocation of the purchase consideration Schedule of Purchase Price Allocation [Table Text Block] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Schedule of identifiable intangible assets related to acquisition of NET Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] Schedule of Finite-Lived Intangible Assets [Table Text Block] Schedule of intangible assets Schedule of Weighted Average Number of Shares [Table Text Block] Schedule of calculations of shares used to compute basic and diluted earnings (loss) per share Schedule of Business Acquisitions, by Acquisition [Table] 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 [Table Text Block] Schedule of stock-based compensation expenses which are included in condensed consolidated statement of operations Schedule of Goodwill [Table Text Block] Schedule of goodwill Schedule of identifiable intangible assets as of the NET Acquisition Date Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Summary of restructuring accrual activity Schedule of Restructuring and Related Costs [Table Text Block] Schedule of Restructuring and Related Costs [Table] Other Asia Pacific Segment, Geographical, Groups of Countries, Group One [Member] GEOGRAPHIC INFORMATION Europe, Middle East and Africa Segment, Geographical, Groups of Countries, Group Two [Member] Segment Reporting Disclosure [Text Block] GEOGRAPHIC INFORMATION Segment Reporting, Policy [Policy Text Block] Operating segments Segment, Geographical [Domain] Sales and marketing Selling and Marketing Expense Selling and Marketing Expense [Member] Sales and marketing Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract] Aggregate intrinsic value (in dollars) Share-based Compensation Arrangement by Share-based Payment Award, Equity 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Options, Nonvested, Number Unvested balance at the beginning of the period (in shares) Unvested balance at the end of the period (in shares) Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Stock-Based Compensation Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Forfeited (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Expired (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum Risk-free interest rates, minimum (as a percent) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Exercised (in dollars per share) Risk-free interest rate (as a percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Expected dividend yield (as a percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate Weighted average volatility (as a percent) Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period Expired (in shares) Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Weighted average grant date fair value of stock options granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value Total intrinsic values of stock options exercised (in dollars) Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Weighted average remaining contractual life (in years) Number of shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Range of assumptions used in estimating fair value of options Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number Exercisable at the end of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Vested or expected to vest at the end of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value Exercisable at the end of the period (in dollars) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Outstanding at the beginning of the period (in dollars per share) Outstanding at the end of the period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Outstanding at the end of the period (in dollars) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Vested or expected to vest at the end of the period (in dollars) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price Exercisable at the end of the period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Outstanding at the beginning of the period (in shares) Outstanding at the end of the period (in shares) Award Type [Domain] Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Vested or expected to vest at the end of the period (in dollars per share) Statement [Table] Scenario [Axis] Statement Statement [Line Items] Consolidated Statements of Stockholders' Equity and Comprehensive Loss Condensed Consolidated Statements of Cash Flows Equity Components [Axis] Condensed Consolidated Balance Sheets Condensed Consolidated Statements of Comprehensive Loss Geographical [Axis] Stock Issued During Period, Shares, Period Increase (Decrease) Stock Options [Member] Stock options Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Issuance of vested performance-based stock awards (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Exercised (in shares) Issuance of common stock in connection with employee stock purchase plan Stock Issued During Period, Value, Employee Stock Purchase Plan Vesting of restricted stock Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Vesting of restricted stock (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Issuance of common stock in connection with employee stock purchase plan (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Stockholders' equity: Stockholders' Equity Attributable to Parent [Abstract] Total stockholders' equity Stockholders' Equity Attributable to Parent Balance Balance STOCKHOLDER RIGHTS PLAN Stockholders' Equity Note Disclosure [Text Block] STOCKHOLDER RIGHTS PLAN Stockholders' Equity, Period Increase (Decrease) SUBSEQUENT EVENT Subsequent Events [Text Block] SUBSEQUENT EVENT Subsequent Event Type [Domain] Subsequent event Subsequent Event [Line Items] Subsequent Event Type [Axis] Subsequent Event [Table] Subsequent event Subsequent Event [Member] Supplemental disclosure of cash flow information: Supplemental Cash Flow Information [Abstract] Title of Individual with Relationship to Entity [Domain] Treasury stock, at cost; 2,296,910 common shares Treasury Stock, Value Treasury Stock, Shares Treasury stock, common shares Treasury Stock Treasury Stock [Member] Treasury Stock, Retired, Cost Method, Amount Cancellation and retirement of treasury stock Cancellation and retirement of treasury stock Treasury Stock [Text Block] CANCELLATION AND RETIREMENT OF TREASURY STOCK Cancellation and retirement of treasury stock (in shares) Treasury Stock, Shares, Retired Type of Restructuring [Domain] Use of Estimates, Policy [Policy Text Block] Use of Estimates and Judgments US Government Agencies Debt Securities [Member] U.S. government agency notes Shares used to compute earnings (loss) per share: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Reconciliation of weighted average shares outstanding from basic to diluted Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Weighted average shares outstanding - basic Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Weighted average shares outstanding - diluted Weighted Average Number Diluted Shares Outstanding Adjustment Potential dilutive common shares Debt Instrument, Increase, Accrued Interest Payment of accrued interest on debentures The acquisition-date fair value of the equity awards assumed. Business Acquisition Cost Of Assumed Equity Awards Fair value of assumed equity award which is recorded as additional purchase consideration Fair value of equity awards assumed Business acquisition purchase consideration - assumed equity awards