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Ten Years, Fair Value Due after 10 years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value Total available-for-sale debt securities Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value Colocation, 2019 Purchase Obligation, Due in Next Twelve Months Colocation, 2020 Purchase Obligation, Due in Second Year Colocation, 2021 Purchase Obligation, Due in Third Year Colocation, 2022 Purchase Obligation, Due in Fourth Year Colocation, 2023 and thereafter Purchase Obligation, Due in Fifth Year and Thereafter Purchase Obligation, Due in Fifth Year and Thereafter Colocation, total Purchase Obligation Restructuring Restructuring and Related Activities Disclosure [Text Block] Statement of Financial Position [Abstract] Accounts receivable, allowance for doubtful accounts (in dollars) Allowance for Doubtful Accounts Receivable, Current Preferred stock, par value (in dollars per share) Preferred stock, shares authorized (shares) Preferred Stock, Shares Authorized Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized (shares) Common Stock, Shares Authorized Common stock, shares issued (in shares) Common stock, shares outstanding (shares) Common Stock, Shares, Outstanding Treasury stock, shares (shares) Treasury Stock, Shares 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 Thereafter Lessee, Operating Lease, Liability, Payments, Due after Year Five Total future lease payments Lessee, Operating Lease, Liability, Payments, Due Less: amount representing interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Present value of future lease payments (lease liability) Weighted-average remaining lease term (years), weighted based on lease liability balances Operating Lease, Weighted Average Remaining Lease Term Weighted-average discount rate (percentages), weighted based on the remaining balance of lease payments Operating Lease, Weighted Average Discount Rate, Percent Cash paid for amounts included in the measurement of lease liabilities Operating Lease, Payments Lease liabilities arising from obtaining right-of-use assets Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Earnings per Common Share (EPS) Earnings Per Share [Text Block] Components of other (expense) income, net Schedule of Other Nonoperating Income (Expense) [Table Text Block] Debt Debt Disclosure [Text Block] Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Restricted stock awards Restricted Stock [Member] Convertible Debt Securities Convertible Debt Securities [Member] Employee Stock Option Employee Stock Option [Member] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Earnings Per Share Reconciliation [Abstract] Earnings Per Share Reconciliation [Abstract] Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] Preferred stock dividend Preferred Stock Dividends and Other Adjustments Net loss from operations attributable to Synchronoss Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Income effect for interest on convertible debt, net of tax Interest on Convertible Debt, Net of Tax Weighted average common shares outstanding - basic (in shares) Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract] Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract] Shares from assumed conversion of convertible debt (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities Shares from assumed conversion of preferred stock (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock Options and unvested restricted shares (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Weighted average common shares outstanding - diluted (in shares) Anti-dilutive stock options excluded (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Stockholder's Equity Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Number of Awards Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Non-vested at the beginning of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Non-vested 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, Additional Disclosures [Abstract] Non-vested at the beginning of the period (in dollar 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 dollar 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 dollar 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 dollar per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Non-vested at the end of the period (in dollar per share) ASSETS Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Restricted cash Restricted Cash and Cash Equivalents, Current Marketable securities, current Available-for-sale Securities, Current Accounts receivable, net of allowances of $5,139 and $4,599 at March 31, 2019 and December 31, 2018, respectively Prepaid expenses Prepaid Expense, Current Other current assets Other Assets, Current Total current assets Assets, Current Marketable securities, non-current Available-for-sale Securities, Noncurrent Property and equipment, net Property, Plant and Equipment, Net Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Goodwill Goodwill Intangible assets, net Finite-Lived Intangible Assets, Net Other assets Other Assets, Noncurrent Equity method investment Equity Method Investments Total assets Assets LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity [Abstract] Current liabilities: Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Accrued expenses Accrued Liabilities, Current Deferred revenues, current Contract with Customer, Liability, Current Short-term convertible debt, net of debt issuance costs Short-term Debt Total current liabilities Liabilities, Current Lease financing obligation Capital Lease Obligations, Noncurrent Operating lease liabilities, non-current Deferred tax liabilities Deferred Income Tax Liabilities, Net Deferred revenues, non-current Contract with Customer, Liability, Noncurrent Other non-current liabilities Other Liabilities, Noncurrent Redeemable noncontrolling interest Redeemable Noncontrolling Interest, Equity, Carrying Amount Commitments and contingencies Commitments and Contingencies Series A Convertible Participating Perpetual Preferred Stock, $0.0001 par value; 10,000 shares authorized; 195 shares issued and outstanding at March 31, 2019 Preferred Stock, Value, Issued Stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Common stock, $0.0001 par value; 100,000 shares authorized, 49,908 and 49,836 shares issued; 42,746 and 42,674 outstanding at March 31, 2019 and December 31, 2018, respectively Common Stock, Value, Issued Treasury stock, at cost (7,162 and 7,162 shares at March 31, 2019 and December 31, 2018, respectively) Treasury Stock, Value Additional paid-in capital Additional Paid in Capital, Common Stock Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Total stockholders’ equity Total liabilities and stockholders’ equity Liabilities and Equity Temporary Equity, by Class of Stock [Table] Temporary Equity, by Class of Stock [Table] Preferred Stock Preferred Stock [Member] Temporary Equity [Line Items] Temporary Equity [Line Items] Increase (Decrease) in Temporary Equity [Roll Forward] Increase (Decrease) in Temporary Equity [Roll Forward] Beginning balance (in shares) Temporary Equity, Shares Outstanding Beginning balance Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests Issuance of preferred stock (in shares) Temporary Equity, Stock Issued During Period, Shares, New Issues Temporary Equity, Stock Issued During Period, Shares, New Issues Issuance of preferred stock Temporary Equity, Stock Issued During Period, Value, New Issues Initial discount and issuance costs related to preferred stock Temporary Equity, Issuance Costs and Discount Temporary Equity, Issuance Costs and Discount Amortization of preferred stock issuance costs Temporary Equity, Amortization Temporary Equity, Amortization Issuance of preferred PIK dividend (in shares) Temporary Equity, Dividends, Shares Temporary Equity, Dividends, Shares Issuance of preferred PIK dividend Temporary Equity, Dividends, Value Temporary Equity, Dividends, Value Ending balance (in shares) Ending balance Stock options Employee And Directors Stock Options [Member] An arrangement whereby an employee or member of the Board of Directors is entitled to receive in the future, subject to vesting and other restrictions, a number of shares in the entity at a specified price, as defined in the agreement. Weighted-average assumptions Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Expected stock price volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Expected life of options (in years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Expected dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Weighted-average fair value (grant date) of the options (in dollar per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Legal Matters Legal Matters and Contingencies [Text Block] Basis of Presentation and Consolidation Consolidation, Policy [Policy Text Block] Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Leases Lessee, Leases [Policy Text Block] Recently Issued Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Commitments, Contingencies and Other Commitments and Contingencies Disclosure [Text Block] Convertible Senior Notes Unamortized debt issuance cost Debt Issuance Costs, Net Total debt, carrying value Long-term Debt Total short-term debt, carrying value Long-term Debt, Current Maturities Accumulated Other Comprehensive (Loss) / Income Comprehensive Income (Loss) Note [Text Block] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Level 3 Fair Value, Inputs, Level 3 [Member] Summary of assets and liabilities held by the Company and their related classifications under the fair value hierarchy Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Assets Assets, Fair Value Disclosure [Abstract] Cash, cash equivalents and restricted cash Cash and Cash Equivalents, Fair Value Disclosure Marketable securities-short term Debt Securities, Available-for-sale, Current Marketable securities-long term Debt Securities, Available-for-sale, Noncurrent Total assets Assets, Fair Value Disclosure Temporary equity Equity, Fair Value Disclosure [Abstract] Redeemable noncontrolling interests Redeemable Noncontrolling Interest, Equity, Other, Fair Value Total temporary equity Equity, Fair Value Disclosure Transfers between Levels Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract] Fair value of asset transfers between Levels 1, 2, and 3 Fair Value, Assets, Transfers between Levels 1, 2, and 3, Amount Amount of transfers of assets measured on a recurring basis between Levels 1, 2, and 3 of the fair value hierarchy. Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] 2015 Plan Equity Incentive Plan 2015 [Member] Definition: Information pertaining to the 2015 Equity Incentive Plan (the "2015 Plan"). 2017 New Hire Plan New Hire Equity Incentive Plan 2017 [Member] New Hire Equity Incentive Plan 2017 [Member] Number of shares available for grant (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Liability, accrued expenses, non-vested Deferred Compensation Share-based Arrangements, Liability, Current Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Foreign currency Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Unrealized loss on intra-entity foreign currency transactions Accumulated Net Gain Loss On Intra Entity Foreign Currency Transactions [Member] Changes to accumulated comprehensive income resulting from net gain (loss) on intra-entity foreign currency transactions. Unrealized holding losses on marketable debt securities Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income (Loss) [Line Items] Changes in accumulated other comprehensive income (loss) AOCI Attributable to Parent, Net of Tax [Roll Forward] Other comprehensive loss Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Tax effect Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Leases Lessee, Operating Leases [Text Block] Statement of Comprehensive Income [Abstract] Other comprehensive (loss) income, 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 Unrealized loss on available for sale securities Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax Net (loss) income on intra-entity foreign currency transactions Other Comprehensive Income, Net Gain (Loss) on Intra Entity Foreign Currency Transactions Arising During Period, Net of Tax Represents the amount after tax, changes to accumulated comprehensive income resulting from net gain (loss) on intra-entity foreign currency transactions. Total other comprehensive (loss) income Other Comprehensive Income (Loss), Net of Tax Comprehensive loss Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive (income) loss attributable to redeemable noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive loss attributable to Synchronoss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Remaining performance obligation Revenue, Remaining Performance Obligation, Amount Remaining performance obligation, percent Revenue, Remaining Performance Obligation, Percentage Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] 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, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, remaining performance obligation, expected timing of satisfaction, period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Stockholders' Equity Shareholders' Equity and Share-based Payments [Text Block] Schedule of stock-based compensation Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] Schedule of fair value assumptions Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of information about stock options outstanding Share-based Compensation, Stock Options, Activity [Table Text Block] Summary of unvested restricted stock activity Nonvested Restricted Stock Shares Activity [Table Text Block] Investments in Affiliates and Related Transactions Equity Method Investments and Joint Ventures Disclosure [Text Block] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Cost of revenues Cost of Sales [Member] Research and development Research and Development Expense [Member] Selling, general and administrative Selling, General and Administrative Expenses [Member] Sale of Stock [Axis] Sale of Stock [Axis] Sale of Stock [Domain] Sale of Stock [Domain] Employee Stock Purchase Plan Employee Stock [Member] Share-based compensation expense Employee Service Share-based Compensation, Aggregate Disclosures [Abstract] Total stock-based compensation expense Allocated Share-based Compensation Expense Tax benefit Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Stock-based compensation cost related to non-vested equity awards not yet recognized as an expense Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Weighted-average period over which stock-based compensation cost related to non-vested equity awards is expected to be recognized Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition