Business Combinations [Abstract]
Schedule of Business Acquisitions, by Acquisition [Table]
Schedule of Business Acquisitions, by Acquisition [Table]
Business Acquisition [Axis]
Business Acquisition [Axis]
Business Acquisition, Acquiree [Domain]
Business Acquisition, Acquiree [Domain]
Edgewater Networks, Inc.
Edgewater Networks, Inc. [Member]
Edgewater
Business Acquisition [Line Items]
Business Acquisition [Line Items]
Payment to selling shareholders
Payments to Acquire Businesses, Net of Cash Acquired
Common stock to be issued (in shares)
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares
Acquisition purchase consideration - deferred payments
Deferred Payments to Acquire Businesses
Deferred Payments to Acquire Businesses
Deferred cash payments, within 6 months from closing date
Deferred Payments to Acquire Businesses, Within 6 Months from Closing Date
Deferred Payments to Acquire Businesses, Within 6 Months from Closing Date
Deferred cash payments, within 9 to 18 months from closing date
Deferred Payments to Acquire Businesses, Within 9 to 18 Months from Closing Date
Deferred Payments to Acquire Businesses, Within 9 to 18 Months from Closing Date
Other income (expense), net
Other Nonoperating Income (Expense)
Weighted average useful life of intangible assets (in years)
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life
Revenue from Contract with Customer [Abstract]
REVENUE RECOGNITION
Revenue from Contract with Customer [Text Block]
Schedule of Timing of Performance Obligation
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]
Disaggregation of Revenue
Disaggregation of Revenue [Table Text Block]
Schedule of Customer Assets and Liabilities
Contract with Customer, Asset and Liability [Table Text Block]
Share-based Payment Arrangement [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]
Stock-based compensation
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion factor
Share-based Compensation Arrangement by Share-based Payment Award, Options, Converted Options from Acquisition, Conversion Ratio
Share-based Compensation Arrangement by Share-based Payment Award, Options, Converted Options from Acquisition, Conversion Ratio
Acquisition consideration (in dollars per share)
Business Acquisition, Share Price
Additional purchase consideration
Business Combination, Additional Consideration Transferred for Assumed Options
Business Combination, Additional Consideration Transferred for Assumed Options
Fair value of Ribbon Replacement Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Converted Options from Acquisition, Fair Value
Share-based Compensation Arrangement by Share-based Payment Award, Options, Converted Options from Acquisition, Fair Value
Fair value of Ribbon Replacement Options, weighted average period (in years)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Converted Options from Acquisition, Weighted Average Remaining Contractual Term
Share-based Compensation Arrangement by Share-based Payment Award, Options, Converted Options from Acquisition, Weighted Average Remaining Contractual Term
Statement of Stockholders' Equity [Abstract]
Statement [Table]
Statement [Table]
Anova Data, Inc.
Anova Data, Inc. [Member]
Anova Data, Inc. [Member]
Adjustments for New Accounting Pronouncements [Axis]
Adjustments for New Accounting Pronouncements [Axis]
Type of Adoption [Domain]
Type of Adoption [Domain]
Accounting Standards Update 2014-09
Accounting Standards Update 2014-09 [Member]
Equity Components [Axis]
Equity Components [Axis]
Equity Component [Domain]
Equity Component [Domain]
Common stock
Common Stock [Member]
Additional paid-in capital
Additional Paid-in Capital [Member]
Accumulated deficit
Retained Earnings [Member]
Accumulated other comprehensive income
AOCI Attributable to Parent [Member]
Statement [Line Items]
Statement [Line Items]
Increase (Decrease) in Stockholders' Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance
Stockholders' Equity Attributable to Parent
Balance (in shares)
Common Stock, Shares, Outstanding
Issuance of common stock in connection with employee stock purchase plan (in shares)
Stock Issued During Period, Shares, Employee Stock Purchase Plans
Issuance of common stock in connection with employee stock purchase plan
Stock Issued During Period, Value, Employee Stock Purchase Plan
Adoption of Accounting Standards Codification 606, Revenue from Contracts with Customers
Cumulative Effect of New Accounting Principle in Period of Adoption
Exercise of stock options (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period
Exercise of stock options
Stock Issued During Period, Value, Stock Options Exercised
Vesting of restricted stock awards and units (in shares)
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures
Vesting of restricted stock awards and units
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures
Vesting of performance-based stock awards (in shares)
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture
Shares of restricted stock returned to the Company under net share settlements to satisfy tax withholding obligations (in shares)
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation
Shares of restricted stock returned to the Company under net share settlements to satisfy tax withholding obligations
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation
Shares issued as consideration in connection with acquisition (in shares)
Stock Issued During Period, Shares, Acquisitions
Shares issued as consideration in connection with acquisition
Stock Issued During Period, Value, Acquisitions
Assumption of equity awards in connection with acquisition of Edgewater Networks, Inc.
Equity Awards Assumed, Acquisitions
Equity Awards Assumed, Acquisitions
Repurchase and retirement of common stock (in shares)
Stock Repurchased During Period, Shares
Repurchase and retirement of common stock
Stock Repurchased During Period, Value
Reclassification of liability to equity for bonuses converted to stock awards
APIC, Share-based Payment Arrangement, Exchange Of Bonuses, Increase For Cost Recognition
APIC, Share-based Payment Arrangement, Exchange Of Bonuses, Increase For Cost Recognition
Stock-based compensation expense
APIC, Share-based Payment Arrangement, Increase for Cost Recognition
Other comprehensive income (loss)
Other Comprehensive Income (Loss), Net of Tax
Net income (loss)
Net Income (Loss) Available to Common Stockholders, Basic
Balance (in shares)
Balance
Plan Name [Axis]
Plan Name [Axis]
Plan Name [Domain]
Plan Name [Domain]
2019 Plan
2019 Stock Incentive Plan [Member]
2019 Stock Incentive Plan [Member]
2007 Plan
Amended and Restated Stock Incentive Plan [Member]
Amended and Restated Stock Incentive Plan [Member]
Number of shares available to grant
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized
Statement of Cash Flows [Abstract]
Cash flows from operating activities:
Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract]
Net income (loss)
Net Income (Loss) Attributable to Parent
Adjustments to reconcile net income (loss) to cash flows provided by (used in) operating activities:
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation and amortization of property and equipment
Depreciation and Amortization of Tangible Assets
The aggregate expense recognized in the current period that allocates the cost of tangible assets to periods that benefit from use of the assets.
Amortization of intangible assets
Amortization of Intangible Assets
Stock-based compensation
Share-based Payment Arrangement, Noncash Expense
Deferred income taxes
Increase (Decrease) in Deferred Income Taxes
Foreign exchange losses
Foreign Currency Transaction Gain (Loss), before Tax
Reduction in deferred purchase consideration
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Asset
Changes in operating assets and liabilities:
Increase (Decrease) in Operating Capital [Abstract]
Accounts receivable
Increase (Decrease) in Accounts Receivable
Inventory
Increase (Decrease) in Inventories
Other operating assets
Increase (Decrease) in Other Operating Assets
Accounts payable
Increase (Decrease) in Accounts Payable
Accrued expenses and other long-term liabilities
Increase (Decrease) in Accrued Liabilities
Deferred revenue
Increase (Decrease) in Contract with Customer, Liability
Net cash provided by (used in) operating activities
Net Cash Provided by (Used in) Operating Activities
Cash flows from investing activities:
Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract]
Purchases of property and equipment
Payments to Acquire Property, Plant, and Equipment
Business acquisitions, net of cash acquired
Maturities of marketable securities
Proceeds from Sale and Maturity of Marketable Securities
Net cash used in investing activities
Net Cash Provided by (Used in) Investing Activities
Cash flows from financing activities:
Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract]
Borrowings under revolving line of credit
Proceeds from Lines of Credit
Principal payments on revolving line of credit
Repayments of Lines of Credit
Proceeds from issuance of long-term debt
Proceeds from Issuance of Long-term Debt
Principal payment of debt, related party
Repayments of Related Party Debt
Principal payment of long-term debt
Repayments of Long-term Debt
Payment of deferred purchase consideration
Payment for Contingent Consideration Liability, Financing Activities
Principal payments of finance leases
Repayments of Long-term Capital Lease Obligations
Payment of debt issuance costs
Payments of Debt Issuance Costs
Proceeds from the sale of common stock in connection with employee stock purchase plan
Proceeds, Issuance of Shares, Share-based Payment Arrangement, Excluding Option Exercised
Proceeds from the exercise of stock options
Proceeds, Issuance of Shares, Share-based Payment Arrangement, Including Option Exercised
Payment of tax withholding obligations related to net share settlements of restricted stock awards
Payment, Tax Withholding, Share-based Payment Arrangement
Repurchase of common stock
Payments for Repurchase of Common Stock
Net cash (used in) provided by financing activities
Net Cash Provided by (Used in) Financing Activities
Effect of exchange rate changes on cash and cash equivalents
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Net decrease in cash and cash equivalents
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect
Cash and cash equivalents, beginning of year
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Cash and cash equivalents, end of period
Supplemental disclosure of cash flow information:
Supplemental Cash Flow Information [Abstract]
Interest paid
Interest Paid, Excluding Capitalized Interest, Operating Activities
Income taxes paid
Income Taxes Paid
Income tax refunds received
Proceeds from Income Tax Refunds
Supplemental disclosure of non-cash investing activities:
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Capital expenditures incurred, but not yet paid
Capital Expenditures Incurred but Not yet Paid
Property and equipment acquired under finance leases
Lease Obligation Incurred
Shares of common stock issued as purchase consideration
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned
Acquisition purchase consideration - assumed equity awards
Business Acquisition Cost Of Assumed Equity Awards
The acquisition-date fair value of the equity awards assumed.
Supplemental disclosure of non-cash financing activities:
Other Noncash Investing and Financing Items [Abstract]
Total fair value of restricted stock awards, restricted stock units and performance-based stock units on date vested
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value
Accounting Policies [Abstract]
BASIS OF PRESENTATION
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block]
Inventory Disclosure [Abstract]
Schedule of inventory
Schedule of Inventory, Current [Table Text Block]
BUSINESS ACQUISITIONS
Business Combination Disclosure [Text Block]
Document And Entity Information
-- None. No documentation exists for this element. --
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
Entity Emerging Growth Company
Entity Emerging Growth Company
Entity Small Business
Entity Small Business
Entity Shell Company
Entity Shell Company
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
Entity Current Reporting Status
Entity Current Reporting Status
Title of Individual [Axis]
Title of Individual [Axis]
Title of Individual [Domain]
Title of Individual [Domain]
Executives
Executive Officer [Member]
Statistical Measurement [Axis]
Statistical Measurement [Axis]
Statistical Measurement [Domain]
Statistical Measurement [Domain]
Minimum
Minimum [Member]
Maximum
Maximum [Member]
Market PSUs
Market PSUs [Member]
Market PSUs [Member]
Stock Bonus Election Program
Stock Bonus Election Program [Member]
Stock Bonus Election Program [Member]
Performance PSUs
Performance PSUs [Member]
Performance PSUs [Member]
2018 Performance Share Units
2018 Performance Share Units [Member]
2018 Performance Share Units [Member]
2017 Performance Share Units
2017 Performance Share Units [Member]
2017 Performance Share Units [Member]
Award Date [Axis]
Award Date [Axis]
Award Date [Domain]
Award Date [Domain]
March 31, 2017
March 31, 2017 [Member]
March 31, 2017 [Member]
March 31, 2018
March 31, 2018 [Member]
March 31, 2018 [Member]
March 16, 2018
March 16, 2018 [Member]
March 16, 2018 [Member]
Award Type [Axis]
Award Type [Axis]
Award Type [Domain]
Award Type [Domain]
Common stock
Share-based Payment Arrangement [Member]
PSUs
Performance Shares [Member]
Percentage of bonus available for program
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Bonus Available for Election
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Bonus Available for Election
Percentage of additional bonus
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Additional Bonus
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Additional Bonus
Number of participants in program
Share-based Compensation Arrangement by Share-based Payment Award, Number of Participants
Share-based Compensation Arrangement by Share-based Payment Award, Number of Participants
Share price (in dollars per share)
Share Price
Granted (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period
Percent of performance metrics achieved
Share-based Compensation Arrangement by Share-based Payment Award, Percent of Performance Metrics Achieved
Share-based Compensation Arrangement by Share-based Payment Award, Percent of Performance Metrics Achieved
Performance period (in years)
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period
Achievement level (as a percentage)
Share-based Compensation Arrangement by Share-based Payment Award, Percent of Performance Metrics Achievement Level One
Share-based Compensation Arrangement by Share-based Payment Award, Percent of Performance Metrics Achievement Level One
Vested (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period
Number of executives granted shares
Share-based Compensation Arrangement by Share-based Payment Award, Number of Executives Granted Shares
Share-based Compensation Arrangement by Share-based Payment Award, Number of Executives Granted Shares
Number of executives shares were released to
Share-based Compensation Arrangement by Share-based Payment Award, Number of Executives Shares Released To
Share-based Compensation Arrangement by Share-based Payment Award, Number of Executives Shares Released To
Percent of achievement over target
Share-based Compensation Arrangement by Share-based Payment Award, Percent of Performance Achieved Over Target
Share-based Compensation Arrangement by Share-based Payment Award, Percent of Performance Achieved Over Target
Remaining unvested (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number
Stock-based compensation expense
Share-based Payment Arrangement, Expense
Stock Options
Share-based Payment Arrangement, Option [Member]
RSAs
Restricted Stock [Member]
RSUs
Restricted Stock Units (RSUs) [Member]
Employee Stock
Employee Stock [Member]
Income Statement Location [Axis]
Income Statement Location [Axis]
Income Statement Location [Domain]
Income Statement Location [Domain]
Product cost of revenue
Product Cost of Sales [Member]
Represents the primary financial statement caption in which reported facts about product cost of sales have been included.
Service cost of revenue
Service Cost of Sales [Member]
Represents the primary financial statement caption in which reported facts about service cost of sales have been included.
Research and development
Research and Development Expense [Member]
Sales and marketing
Selling and Marketing Expense [Member]
General and administrative
General and Administrative Expense [Member]
Number of shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at the beginning of the period (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number
Granted (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross
Exercised (in shares)
Forfeited (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period
Expired (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period
Outstanding at the end of the period (in shares)
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, Outstanding, 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, Exercisable, Number
Weighted average exercise price
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding at the beginning of the period (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price
Granted (in dollars per share)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price
Exercised (in dollars per share)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price
Forfeited (in dollars per share)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price
Expired (in dollars per share)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price
Outstanding at the end of the period (in dollars per share)
Vested or expected to vest at the end of the period (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, 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, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price
Weighted average remaining contractual life (in years)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding at the end of the period
Share-based Compensation Arrangement by Share-based Payment Award, Options, 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, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term
Exercisable at the end of the period
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term
Aggregate intrinsic value (in dollars)
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]
Outstanding at the end of the period (in dollars)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, 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, Outstanding, Aggregate Intrinsic Value
Exercisable at the end of the period (in dollars)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value
Total intrinsic values of stock options exercised (in dollars)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value
Cash received from the exercise of stock options (in dollars)
Proceeds from Stock Options Exercised
Change in unvested restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested balance at the beginning of the period (in shares)
Vested (in shares)
Forfeited (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period
Unvested balance at the end of the period (in shares)
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]
Unvested balance at the end of the period (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value
Granted (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value
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
Forfeited (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value
Unvested balance at end of the period (in dollars per share)
Offering period (in months)
Share-based Compensation by Share-based Payment Award, Offering Period
Share-based Compensation by Share-based Payment Award, Offering Period
Purchase price of common stock (percentage)
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent
Stock-based compensation expense (reversal)
Maximum number of shares purchasable per employee
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Per Employee
Tax benefit from stock based compensation expense
Share-based Payment Arrangement, Expense, Tax Benefit
Fair value of the assumed awards attributable to future stock-based compensation expense
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount
Expected period for unrecognized expense
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of intangible assets
Schedule of Finite-Lived Intangible Assets [Table Text Block]
Schedule of amortization expense related to intangible assets
Schedule of Finite Lived Intangible Assets Amortization Expense [Table Text Block]
Tabular disclosure of amortization expense related to finite lived intangible assets.
Schedule of estimated future amortization expense for intangible assets
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
Schedule of goodwill
Schedule of Goodwill [Table Text Block]
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments [Table]
Schedule of Long-term Debt Instruments [Table]
Long-term Debt, Type [Axis]
Long-term Debt, Type [Axis]
Long-term Debt, Type [Domain]
Long-term Debt, Type [Domain]
Notes payable
Notes Payable, Other Payables [Member]
Debt Instrument [Axis]
Debt Instrument [Axis]
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
Promissory Note
Promissory Note [Member]
Promissory Note [Member]
GENBAND
GENBAND Holdings Company [Member]
GENBAND Holdings Company [Member]
Debt Instrument [Line Items]
Debt Instrument [Line Items]
Promissory note
Notes Payable
Promissory note interest rate
Debt Instrument, Interest Rate, Stated Percentage
Principal amount
Debt Instrument, Face Amount
Interest converted to principal
Accumulated Capitalized Interest Costs
Repayment of notes payable
Repayments of Notes Payable
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]
Developed technology
Developed Technology Rights [Member]
Customer relationships
Customer Relationships [Member]
Trade names
Trade Names [Member]
Fair value of consideration transferred:
Business Combination, Consideration Transferred [Abstract]
Cash consideration:
Payments to Acquire Businesses, Net of Cash Acquired [Abstract]
Cash paid to Edgewater Selling Stakeholders
Payments to Acquire Businesses, Gross
Less cash acquired
Cash Acquired from Acquisition
Net cash consideration
Deferred purchase consideration
Business Combination, Deferred Purchase Consideration
Business Combination, Deferred Purchase Consideration
Fair value of Ribbon stock issued
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable
Fair value of equity awards assumed (see Note 12)
Fair value of total consideration
Business Combination, Consideration Transferred
Fair value of assets acquired and liabilities assumed:
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Current assets, net of cash acquired
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets
Property and equipment
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment
Intangible assets:
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill [Abstract]
Finite-lived intangibles
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles
Goodwill
Goodwill
Other noncurrent assets
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets
Deferred revenue
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue
Other current liabilities
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities
Deferred revenue, net of current
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Deferred Revenue
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Deferred Revenue
Other long-term liabilities
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other
Total
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net
Restructuring and Related Activities [Abstract]
Schedule of Restructuring and Related Costs [Table]
Schedule of Restructuring and Related Costs [Table]
Restructuring Type [Axis]
Restructuring Type [Axis]
Type of Restructuring [Domain]
Type of Restructuring [Domain]
Severance
Employee Severance [Member]
Facilities
Facility Closing [Member]
Variable and other facilities costs
Variable And Other Facilities Costs [Member]
Variable And Other Facilities Costs [Member]
Restructuring Plan [Axis]
Restructuring Plan [Axis]
Restructuring Plan [Domain]
Restructuring Plan [Domain]
2019 Restructuring Initiative
2019 Restructuring Initiative [Member]
2019 Restructuring Initiative [Member]
Merger Restructuring Initiative
Merger Restructuring [Member]
Merger Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Cost and Reserve [Line Items]
Restructuring and related
Restructuring Charges
Number of positions eliminated
Restructuring and Related Cost, Number of Positions Eliminated
Accelerated rent amortization
Restructuring and Related Cost, Accelerated Depreciation
Investments, All Other Investments [Abstract]
Schedule of amortized cost, gross unrealized gains and losses and fair value of marketable debt and equity securities and investments
Schedule of Cash Equivalents, Marketable Securities and Investments Reconciliation [Table Text Block]
Tabular disclosure of the reconciliation of cash equivalents, marketable securities and investments from cost basis to fair value.
Schedule of fair value of financial assets
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block]
Schedule of Finite-Lived Intangible Assets [Table]
Schedule of Finite-Lived Intangible Assets [Table]
In-process research and development
In Process Research and Development [Member]
Internal use software
Computer Software, Intangible Asset [Member]
Intangible Assets And Goodwill
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period (years)
Finite-Lived Intangible Asset, Useful Life
Cost
Finite-Lived Intangible Assets, Gross
Accumulated amortization
Finite-Lived Intangible Assets, Accumulated Amortization
Net carrying value
Intangible Assets, Net (Excluding Goodwill)
Amortization expense
Estimated future amortization expense for intangible assets
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Remainder of 2019
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year
2020
Finite-Lived Intangible Assets, Amortization Expense, Year Two
2021
Finite-Lived Intangible Assets, Amortization Expense, Year Three
2022
Finite-Lived Intangible Assets, Amortization Expense, Year Four
2023
Finite-Lived Intangible Assets, Amortization Expense, Year Five
Thereafter
Finite-Lived Intangible Assets, Amortization Expense, after Year Five
Total
Finite-Lived Intangible Assets, Net
Statement of Comprehensive Income [Abstract]
Other comprehensive income (loss), net of tax:
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Foreign currency translation adjustments
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent
Unrealized gain (loss) on available-for sale marketable securities, net of reclassification adjustments for realized amounts
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent
Employee retirement benefits
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax
Other comprehensive income, net of tax
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Comprehensive income (loss)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Risks and Uncertainties [Abstract]
Schedule of customers contributing 10% or more of the revenue
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
Earnings Per Share [Abstract]
Schedule of calculations of shares used to compute basic and diluted earnings (loss) per share
Schedule of Weighted Average Number of Shares [Table Text Block]
Income Statement [Abstract]
Product and Service [Axis]
Product and Service [Axis]
Product and Service [Domain]
Product and Service [Domain]
Product
Product [Member]
Service
Service [Member]
Revenue:
Revenues [Abstract]
Total revenue
Revenue from Contract with Customer, Excluding Assessed Tax
Cost of revenue:
Cost of Revenue [Abstract]
Total cost of revenue
Cost of Goods and Services Sold
Gross profit
Gross Profit
Operating expenses:
Operating Expenses [Abstract]
Research and development
Research and Development Expense
Sales and marketing
Selling and Marketing Expense
General and administrative
General and Administrative Expense
Acquisition- and integration-related
Business Combination, Acquisition Related Costs
Total operating expenses
Operating Expenses
Income (loss) from operations
Operating Income (Loss)
Interest expense, net
Interest Income (Expense), Nonoperating, Net
Income (loss) before income taxes
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest
Income tax benefit (provision)
Income Tax Expense (Benefit)
Net income (loss)
Earnings (loss) per share:
Basic (in dollars per share)
Earnings Per Share, Basic
Diluted (in dollars per share)
Earnings Per Share, Diluted
Shares used to compute earnings (loss) per share:
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Basic (in shares)
Weighted Average Number of Shares Outstanding, Basic
Diluted (in shares)
Weighted Average Number of Shares Outstanding, Diluted
Severance and related costs
Severance Costs
Variable and other facilities-related costs
Business Exit Costs
Accelerated amortization of lease assets due to cease-use
Restructuring and related expense
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
Marketable Securities, Current
Accounts receivable, net
Accounts Receivable, after Allowance for Credit Loss, Current
Inventory
Inventory, Net
Other current assets
Other Assets, Current
Total current assets
Assets, Current
Property and equipment, net
Property, Plant and Equipment, Net
Intangible assets, net
Deferred income taxes
Deferred Income Tax Assets, Net
Operating lease right-of-use assets
Operating Lease, Right-of-Use Asset
Other assets
Other Assets, Noncurrent
Total assets
Assets
Liabilities and Stockholders' Equity
Liabilities and Equity [Abstract]
Current liabilities:
Liabilities, Current [Abstract]
Current portion of long-term debt
Long-term Debt, Current Maturities
Revolving credit facility
Line of Credit, Current
Accounts payable
Accounts Payable, Current
Accrued expenses and other
Accounts Payable and Other Accrued Liabilities, Current
Operating lease liabilities
Operating Lease, Liability, Current
Deferred revenue
Contract with Customer, Liability, Current
Total current liabilities
Liabilities, Current
Long-term debt, net of current
Long-term Debt, Excluding Current Maturities
Long-term debt, related party
Due to Related Parties, Noncurrent
Operating lease liabilities, net of current
Operating Lease, Liability, Noncurrent
Deferred revenue, net of current
Contract with Customer, Liability, Noncurrent
Deferred income taxes
Deferred Income Tax Liabilities, Net
Other long-term liabilities
Other Liabilities, Noncurrent
Total liabilities
Liabilities
Commitments and contingencies (Note 17)
Commitments and Contingencies
Stockholders' equity:
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, $0.01 par value per share; 10,000,000 shares authorized, none issued and outstanding
Preferred Stock, Value, Issued
Common stock, $0.0001 par value per share; 240,000,000 shares authorized; 110,156,325 shares issued and outstanding at September 30, 2019; 106,815,636 shares issued and outstanding at December 31, 2018
Common Stock, Value, Issued
Additional paid-in capital
Additional Paid in Capital, Common Stock
Accumulated deficit
Retained Earnings (Accumulated Deficit)
Accumulated other comprehensive income
Accumulated Other Comprehensive Income (Loss), Net of Tax
Total stockholders' equity
Total liabilities and stockholders' equity
Liabilities and Equity
Payables and Accruals [Abstract]
ACCRUED EXPENSES
Accounts Payable and Accrued Liabilities Disclosure [Text Block]
Schedule of activity related to outstanding stock options
Share-based Payment Arrangement, Option, Activity [Table Text Block]
Schedule of stock options, additional information
Schedule of Share-based Compensation, Stock Options, Additional Information [Table Text Block]
Schedule of Share-based Compensation, Stock Options, Additional Information [Table Text Block]
Schedule of activity related to unvested restricted stock grants
Schedule Of Share-Based Compensation Restricted Stock Activity [Table Text Block]
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 activity related to performance stock awards
Schedule of Share based Compensation Performance Stock Awards Activity [Table Text Block]
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 stock-based compensation expenses which are included in condensed consolidated statement of operations
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
Leases [Abstract]
LEASES
Lessee, Finance Leases [Text Block]
LEASES
Lessee, Operating Leases [Text Block]
Concentration Risk [Table]
Concentration Risk [Table]
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark [Domain]
Concentration Risk Benchmark [Domain]
Revenue
Sales [Member]
Accounts receivable balance
Accounts Receivable [Member]
Concentration Risk Type [Axis]
Concentration Risk Type [Axis]
Concentration Risk Type [Domain]
Concentration Risk Type [Domain]
Customer
Customer Concentration Risk [Member]
Customer [Axis]
Customer [Axis]
Customer [Domain]
Customer [Domain]
AT&T Inc.
AT And T Inc. [Member]
Represents AT&T Inc., a major customer of the entity.
Verizon Communications Inc.
Verizon [Member]
Verizon [Member]
MAJOR CUSTOMERS
Concentration Risk [Line Items]
Concentration risk, percentage
Concentration Risk, Percentage
Lessee, Lease, Description [Table]
Lessee, Lease, Description [Table]
Lessee, Lease, Description [Line Items]
Lessee, Lease, Description [Line Items]
Operating Leases, After Adoption of 842:
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
Remainder of 2019
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year
2020
Lessee, Operating Lease, Liability, Payments, Due Year Two
2021
Lessee, Operating Lease, Liability, Payments, Due Year Three
2022
Lessee, Operating Lease, Liability, Payments, Due Year Four
2023
Lessee, Operating Lease, Liability, Payments, Due Year Five
2024 and beyond
Lessee, Operating Lease, Liability, Payments, Due after Year Five
Total lease payments
Lessee, Operating Lease, Liability, Payments, Due
Less: interest
Lessee, Operating Lease, Liability, Undiscounted Excess Amount
Present value of lease liabilities
Operating Lease, Liability
Finance Leases, After Adoption of 842:
Finance Lease, Liability, Payment, Due [Abstract]
Remainder of 2019
Finance Lease, Liability, Payments, Remainder of Fiscal Year
2020
Finance Lease, Liability, Payments, Due Year Two
2021
Finance Lease, Liability, Payments, Due Year Three
2022
Finance Lease, Liability, Payments, Due Year Four
2023
Finance Lease, Liability, Payments, Due Year Five
2024 and beyond
Finance Lease, Liability, Payments, Due after Year Five
Total lease payments
Finance Lease, Liability, Payment, Due
Less: interest
Finance Lease, Liability, Undiscounted Excess Amount
Present value of lease liabilities
Finance Lease, Liability
Operating Leases, Before Adoption of 842
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019
Operating Leases, Future Minimum Payments Due, Next Twelve Months
2020
Operating Leases, Future Minimum Payments, Due in Two Years
2021
Operating Leases, Future Minimum Payments, Due in Three Years
2022
Operating Leases, Future Minimum Payments, Due in Four Years
2023
Operating Leases, Future Minimum Payments, Due in Five Years
2024 and beyond
Operating Leases, Future Minimum Payments, Due Thereafter
Total lease payments
Operating Leases, Future Minimum Payments Due
Finance Leases, Before Adoption of 842
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019
Capital Leases, Future Minimum Payments Due, Next Twelve Months
2020
Capital Leases, Future Minimum Payments Due in Two Years
2021
Capital Leases, Future Minimum Payments Due in Three Years
2022
Capital Leases, Future Minimum Payments Due in Four Years
2023
Capital Leases, Future Minimum Payments Due in Five Years
2024 and beyond
Capital Leases, Future Minimum Payments Due Thereafter
Total lease payments
Capital Leases, Future Minimum Payments Due
Less: interest
Capital Leases, Future Minimum Payments, Interest Included in Payments
Present value of lease liabilities
Capital Lease Obligations
Cash payments
Payments for Restructuring
Percent of restructuring charges due in less than one year
Restructuring Charges, Current, Percent
Restructuring Charges, Current, Percent
Restructuring payments, current, term (in years)
Restructuring Charges, Current, Payment Term
Restructuring Charges, Current, Payment Term
Restructuring payments, noncurrent, term (in years)
Restructuring Charges, Noncurrent, Payment Term
Restructuring Charges, Noncurrent, Payment Term
Sublease income
Sublease Income
Operating lease cost
Operating Lease, Cost
Finance lease cost
Lease, Cost [Abstract]
Amortization of leased assets
Finance Lease, Right-of-Use Asset, Amortization
Interest on lease liabilities
Finance Lease, Interest Expense
Short-term lease cost
Short-term Lease, Cost
Variable lease costs (costs excluded from minimum fixed lease payments)
Variable Lease, Cost
Net lease cost
Lease, Cost
Variable lease, payment
Variable Lease, Payment
Disaggregation of Revenue [Table]
Disaggregation of Revenue [Table]
Sales to enterprise customers
Enterprise Customers [Member]
Enterprise Customers [Member]
Sales to service provider customers
Service Provider Customers [Member]
Service Provider Customers [Member]
Contract with Customer, Sales Channel [Axis]
Contract with Customer, Sales Channel [Axis]
Contract with Customer, Sales Channel [Domain]
Contract with Customer, Sales Channel [Domain]
Indirect sales through channel partner program
Sales Channel, Through Intermediary [Member]
Direct sales
Sales Channel, Directly to Consumer [Member]
Product revenue
Product Revenue [Member]
Product Revenue [Member]
Service revenue (maintenance)
Service Revenue, Maintenance [Member]
Service Revenue, Maintenance [Member]
Service revenue (professional services)
Service Revenue, Professional Services [Member]
Service Revenue, Professional Services [Member]
Geographical [Axis]
Geographical [Axis]
Geographical [Domain]
Geographical [Domain]
United States
UNITED STATES
Europe, Middle East and Africa
EMEA [Member]
Japan
JAPAN
Other Asia Pacific
Asia Pacific [Member]
Other
Other Geographical Location [Member]
Other Geographical Location [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue [Line Items]
Summary of restructuring accrual activity
Restructuring and Related Costs [Table Text Block]
Schedule of accrued expenses
Schedule of Accrued Liabilities [Table Text Block]
Schedule of Goodwill [Table]
Schedule of Goodwill [Table]
Goodwill [Line Items]
Goodwill [Line Items]
Goodwill [Roll Forward]
Goodwill [Roll Forward]
Goodwill, gross, beginning of period
Goodwill, Gross
Accumulated impairment losses, beginning of period
Goodwill, Impaired, Accumulated Impairment Loss
Goodwill. beginning of period
Purchase accounting adjustments
Goodwill, Acquired During Period
Goodwill, gross, end of period
Accumulated impairment losses, end of period
Goodwill, end of period
Accounts receivable
Contract With Customer Change In Asset, Accounts Receivable [Roll Forward]
Contract With Customer Change In Asset, Accounts Receivable [Roll Forward]
Beginning balance
Accounts Receivable, before Allowance for Credit Loss
Increase (decrease), net
Increase (Decrease) in Accounts Receivable, Current
Increase (Decrease) in Accounts Receivable, Current
Ending balance
Unbilled accounts receivable
Contract With Customer Change In Asset, Unbilled Receivables, Current [Roll Forward]
Contract With Customer Change In Asset, Unbilled Receivables, Current [Roll Forward]
Beginning balance
Unbilled Contracts Receivable
Increase (decrease), net
Increase (Decrease) in Unbilled Receivables, Current
Increase (Decrease) in Unbilled Receivables, Current
Ending balance
Deferred revenue (current)
Contract With Customer Change In Liability, Current [Roll Forward]
Contract With Customer Change In Liability, Current [Roll Forward]
Beginning balance
Increase (decrease), net
Increase (Decrease) in Contract With Customer, Liability, Current, Net
Increase (Decrease) in Contract With Customer, Liability, Current, Net
Ending balance
Deferred revenue (long-term)
Contract With Customer Change In Liability, Noncurrent [Roll Forward]
Contract With Customer Change In Liability, Noncurrent [Roll Forward]
Beginning balance
Increase (decrease), net
Increase (Decrease) in Contract With Customer, Liability, Noncurrent, Net
Increase (Decrease) in Contract With Customer, Liability, Noncurrent, Net
Ending balance
Revenue recognized
Contract with Customer, Liability, Revenue Recognized
Revenue recognized
Revenue, Remaining Performance Obligation, Amount
Customer contract expected life (in years)
Capitalized Contract Cost, Amortization Period
Deferred sales commissions capitalized
Capitalized Contract Cost, Net
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]
Revenue, remaining performance obligation, period
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period
Related Party Transactions [Abstract]
RELATED PARTY TRANSACTIONS
Related Party Transactions Disclosure [Text Block]
ASC 842
Accounting Standards Update 2016-02 [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve [Roll Forward]
Balance at the beginning of the period
Restructuring Reserve
Initiatives charged to expense
Adjustment for the impact of ASC 842 adoption
Restructuring Reserve, Adjustment for Adoption of New Accounting Pronouncement
Restructuring Reserve, Adjustment for Adoption of New Accounting Pronouncement
Cash payments
Balance at the end of the period
RESTRUCTURING AND FACILITIES CONSOLIDATION INITIATIVES
Restructuring and Related Activities Disclosure [Text Block]
Additional amortization expense
Variable lease cost
Square feet under lease
Operating Lease, Area of Lease
Operating Lease, Area of Lease
Rent expense
Operating Leases, Rent Expense
Interest expense for finance leases
Amortization expense for finance leases
STOCK-BASED COMPENSATION PLANS
Share-based Payment Arrangement [Text Block]
Cash paid for amounts included in the measurement of lease liabilities
Cash Flow, Operating Activities, Lessee [Abstract]
Operating cash flows from operating leases
Operating Lease, Payments
Operating cash flows from finance leases
Finance Lease, Interest Payment on Liability
Financing cash flows from finance leases
Finance Lease, Principal Payments
Weighted average remaining lease term (years)
Weighted Average Remaining Lease Term [Abstract]
Weighted Average Remaining Lease Term [Abstract]
Operating leases (in years)
Operating Lease, Weighted Average Remaining Lease Term
Finance leases (in years)
Finance Lease, Weighted Average Remaining Lease Term
Weighted average discount rate
Leases, Weighted Average Discount Rate [Abstract]
Leases, Weighted Average Discount Rate [Abstract]
Operating leases (as a percentage)
Operating Lease, Weighted Average Discount Rate, Percent
Finance leases (as a percentage)
Finance Lease, Weighted Average Discount Rate, Percent
Long-term portion of accrued restructuring
Restructuring Reserve, Noncurrent
Investment Holdings [Table]
Investment Holdings [Table]
Financial Instrument [Axis]
Financial Instrument [Axis]
Financial Instruments [Domain]
Financial Instruments [Domain]
U.S. government agency notes
US Government Agencies Debt Securities [Member]
Corporate debt securities
Corporate Debt Securities [Member]
Amortized cost, gross unrealized gains and losses and fair value of marketable debt and equity securities and investments
Investment Holdings [Line Items]
Cash equivalents, amortized cost
Cash Equivalents Amortized Cost
Represents the amortized cost of cash equivalents.
Cash equivalents, fair value
Cash Equivalents, at Carrying Value
Marketable securities, amortized cost
Debt Securities, Available-for-sale, Amortized Cost
Marketable securities, unrealized gains
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax
Marketable securities, unrealized losses
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax
Marketable securities, fair value
Debt Securities, Available-for-sale
DEBT
Debt Disclosure [Text Block]
Preferred stock, par value (in dollars per share)
Preferred Stock, Par or Stated Value Per Share
Preferred stock, shares authorized (in shares)
Preferred Stock, Shares Authorized
Preferred stock, shares issued (in shares)
Preferred Stock, Shares Issued
Preferred stock, shares outstanding (in shares)
Preferred Stock, Shares Outstanding
Common stock, par value (in dollars per share)
Common Stock, Par or Stated Value Per Share
Common stock, shares authorized (in shares)
Common Stock, Shares Authorized
Common stock, shares issued (in shares)
Common Stock, Shares, Issued
Common stock, shares outstanding (in shares)
Professional and services fees (acquisition-related)
Professional Fees
Management bonuses (acquisition-related)
Change of Control Agreements
Change of Control Agreements
Integration-related expenses
Business Combination, Integration Related Costs
Total
Right-of-use Lease Assets and Lease Liabilities
Lessee, Asset and Liabilities [Table Text Block]
Lessee, Asset and Liabilities [Table Text Block]
Lease, Other Information
Lease, Cost [Table Text Block]
Schedule of Future Minimum Fixed Operating Lease Payments
Finance Lease, Liability, Maturity [Table Text Block]
Schedule of Future Minimum Fixed Finance Lease Payments
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
Schedule of Future Minimum Fixed Lease Payments, Operating
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Schedule of Future Minimum Fixed Lease Payments, Finance
Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block]
EARNINGS (LOSS) PER SHARE
Earnings Per Share [Text Block]
INVENTORY
Inventory Disclosure [Text Block]
Assets
Operating lease assets
Finance lease assets
Finance Lease, Right-of-Use Asset
Total leased assets
Operating and Finance Lease, Right-of-Use Asset
Operating and Finance Lease, Right-of-Use Asset
Liabilities
Liabilities [Abstract]
Current
Lease, Liability, Current [Abstract]
Lease, Liability, Current [Abstract]
Operating
Finance
Finance Lease, Liability, Current
Noncurrent
Lease, Liability, Noncurrent [Abstract]
Lease, Liability, Noncurrent [Abstract]
Operating
Finance
Finance Lease, Liability, Noncurrent
Total lease liabilities
Operating and Finance Lease, Liability
Operating and Finance Lease, Liability
Finance lease assets, net of accumulated depreciation
Finance Lease, Right-of-Use Asset, Net
Finance Lease, Right-of-Use Asset, Net
CASH EQUIVALENTS, MARKETABLE SECURITIES AND INVESTMENTS
Financial Instruments Disclosure [Text Block]
Income Tax Disclosure [Abstract]
INCOME TAXES
Income Tax Disclosure [Text Block]
Schedule of Business Acquisitions, by Acquisition
Schedule of Business Acquisitions, by Acquisition [Table Text Block]
Schedule of Components of Acquisition Related Costs
Schedule of Components of Acquisition Related Costs [Table Text Block]
Tabular disclosure of components of acquisition-related costs included in results of operations.
Employee compensation and related costs
Employee-related Liabilities, Current
Deferred purchase consideration
Deferred Purchase Consideration
Deferred Purchase Consideration
Other
Other Accrued Liabilities, Current
Total
Accrued Liabilities, Current
Fair Value, Recurring and Nonrecurring [Table]
Fair Value, Recurring and Nonrecurring [Table]
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV [Axis]
Fair Value, Measurements, Fair Value Hierarchy [Domain]
Fair Value Hierarchy and NAV [Domain]
Quoted prices in active markets (Level 1)
Fair Value, Inputs, Level 1 [Member]
Significant other observable inputs (Level 2)
Fair Value, Inputs, Level 2 [Member]
Significant unobservable inputs (Level 3)
Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents, Marketable securities and Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities, fair value
Number of customers
Number Of Customers
Number Of Customers
Lease liabilities
Number of reportable operating segments
Number of Reportable Segments
Debt Securities, Available-for-sale [Table]
Debt Securities, Available-for-sale [Table]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale [Line Items]
Proceeds from sale of available-for-sale securities
Proceeds from Sale of Debt Securities, Available-for-sale
Period considered to classify available-for-sale securities as investments
Available for sale Securities Debt Maturity Period Considered to Classify as Investments
Represents the period considered to classify available-for-sale debt securities as investments.
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES
Commitments and Contingencies Disclosure [Text Block]
Schedule of Related Party Transactions, by Related Party [Table]
Schedule of Related Party Transactions, by Related Party [Table]
Related Party Transaction [Line Items]
Related Party Transaction [Line Items]
Promissory note issued to GENBAND equity holders
New Credit Facility
New Credit Facility [Member]
New Credit Facility [Member]
Credit Facility [Axis]
Credit Facility [Axis]
Credit Facility [Domain]
Credit Facility [Domain]
Revolving Credit Facility
Revolving Credit Facility [Member]
Letter of Credit
Letter of Credit [Member]
Swingline loan
Bridge Loan [Member]
Line of Credit
Line of Credit [Member]
Variable Rate [Axis]
Variable Rate [Axis]
Variable Rate [Domain]
Variable Rate [Domain]
London Interbank Offered Rate (LIBOR)
London Interbank Offered Rate (LIBOR) [Member]
Base Rate
Base Rate [Member]
Additional Applicable Margin
Additional Applicable Margin [Member]
Additional Applicable Margin [Member]
Commitments from lender
Line of Credit Facility, Maximum Borrowing Capacity
Outstanding debt
Long-term Debt
Debt interest rate
Debt, Weighted Average Interest Rate
Increase commitment under debt instrument
Line of Credit Facility, Increase (Decrease), Net
Basis spread on variable rate
Debt Instrument, Basis Spread on Variable Rate
Default rate percentage
Line of Credit Facility, Default Rate, Percentage
Line of Credit Facility, Default Rate, Percentage
Reconciliation of weighted average shares outstanding from basic to diluted
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Weighted average shares outstanding—basic (in shares)
Potential dilutive common shares (in shares)
Weighted Average Number Diluted Shares Outstanding Adjustment
Weighted average shares outstanding—diluted (in shares)
Options not included in computation of diluted loss per share (in shares)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Equity [Abstract]
Schedule of Stock by Class [Table]
Schedule of Stock by Class [Table]
Share Repurchase Program [Axis]
Share Repurchase Program [Axis]
Share Repurchase Program [Domain]
Share Repurchase Program [Domain]
Repurchase Program
Repurchase Program [Member]
Repurchase Program [Member]
Class of Stock [Line Items]
Class of Stock [Line Items]
Repurchase amount authorized (up to)
Stock Repurchase Program, Authorized Amount
Payments for repurchase of common stock
Stock repurchased and retired during period (in shares)
Stock Repurchased and Retired During Period, Shares
Number of shares repurchased (in shares)
Remaining authorized repurchase amount
Stock Repurchase Program, Remaining Authorized Repurchase Amount
Loss Contingencies [Table]
Loss Contingencies [Table]
Balance Sheet Location [Axis]
Balance Sheet Location [Axis]
Balance Sheet Location [Domain]
Balance Sheet Location [Domain]
Other current assets
Other Current Assets [Member]
Other assets
Other Noncurrent Assets [Member]
Loss Contingencies [Line Items]
Loss Contingencies [Line Items]
Ongoing lawsuits
Loss Contingency, Pending Claims, Number
Damages awarded from other party
Litigation Settlement, Amount Awarded from Other Party
Cash payments from settlement
Proceeds from Legal Settlements
Annual installment receivable
Litigation Settlement Amount Awarded from Other Party, Annual Receivable
Litigation Settlement Amount Awarded from Other Party, Annual Receivable
Installment payments interest rate (as a percentage)
Litigation Settlement Amount Awarded from Other Party, Annual Receivable, Interest Rate
Litigation Settlement Amount Awarded from Other Party, Annual Receivable, Interest Rate
Gain from settlement
Gain (Loss) Related to Litigation Settlement
Interest Income (Expense), Net
Interest Income (Expense), Net
Number of additional shares potentially issued (in number of shares)
Business Acquisition, Potential Issuance of Equity Interest, Number of Shares
Business Acquisition, Potential Issuance of Equity Interest, Number of Shares
Fair value of additional shares potentially issued
Business Acquisition, Potential Issuance of Equity Interest, Value Assigned
Business Acquisition, Potential Issuance of Equity Interest, Value Assigned
Fair value of total consideration
Net assets acquired
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Working Capital
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Working Capital
On-hand final assemblies and finished goods inventories
Inventory, Finished Goods, Net of Reserves
Deferred cost of goods sold
Deferred Costs of Goods Sold, Net of Reserves
Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of deferred costs of goods sold.
Gross inventory
Inventory Finished Goods and Deferred Cost of Goods Sold
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.
Less noncurrent portion (included in other assets)
Inventory, Noncurrent
Current portion
MAJOR CUSTOMERS
Concentration Risk Disclosure [Text Block]
COMMON STOCK REPURCHASES
Treasury Stock [Text Block]
Basis of Presentation
Basis of Accounting, Policy [Policy Text Block]
Leases
Lessee, Leases [Policy Text Block]
Principles of Consolidation
Consolidation, Policy [Policy Text Block]
Use of Estimates and Judgments
Use of Estimates, Policy [Policy Text Block]
Reclassifications
Reclassification, Policy [Policy Text Block]
Fair Value of Financial Instruments
Fair Value of Financial Instruments, Policy [Policy Text Block]
Operating Segments
Segment Reporting, Policy [Policy Text Block]
Recent Accounting Pronouncements
New Accounting Pronouncements, Policy [Policy Text Block]
Revenue Recognition
Revenue from Contract with Customer [Policy Text Block]
INTANGIBLE ASSETS AND GOODWILL
Goodwill and Intangible Assets Disclosure [Text Block]