Intangible Assets, Net (Including Goodwill) [Abstract] Carrying Value of Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Schedule of Finite-Lived Intangible Assets, Future Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Schedule of Goodwill Schedule of Goodwill [Table Text Block] Revenue from Contract with Customer [Abstract] Contract assets Contract with Customer, Asset, Net, Current Deferred revenue Contract with Customer, Liability Change in other current assets Increase (Decrease) in Other Current Assets Change in deferred revenue Increase (Decrease) in Contract with Customer, Liability Segment Reporting [Abstract] GEOGRAPHICAL INFORMATION Segment Reporting Disclosure [Text Block] Leases [Abstract] Weighted average remaining lease term Operating Lease, Weighted Average Remaining Lease Term Weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent Operating cash flow from operating leases Operating Lease, Payments Commitments and Contingencies Disclosure [Abstract] COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Remaining 2020 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2023 Finite-Lived Intangible Assets, Amortization Expense, Year Four Net Carrying Amount Finite-Lived Intangible Assets, Net Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Statistical Measurement [Axis] Statistical Measurement [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Term of contract Lessee, Operating Lease, Term of Contract Renewal term Lessee, Operating Lease, Renewal Term Operating lease expense Operating Lease, Cost Cover page. Document Type Document Type Document Quarterly Report Document Quarterly Report Document Period End Date Document Period End Date Document Transition Report Document Transition Report Entity File Number Entity File Number Entity Registrant Name Entity Registrant Name Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address, Address Line One Entity Address, City or Town Entity Address, City or Town Entity Address, State or Province Entity Address, State or Province Entity Address, Postal Zip Code Entity Address, Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Title of 12(b) Security Title of 12(b) Security Trading Symbol Trading Symbol Security Exchange Name Security Exchange Name Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Interactive Data Current Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Shell Company Entity Shell Company Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Central Index Key Entity Central Index Key Amendment Flag Amendment Flag Current Fiscal Year End Date Current Fiscal Year End Date Document Fiscal Period Focus Document Fiscal Period Focus Document Fiscal Year Focus Document Fiscal Year Focus Income Tax Disclosure [Abstract] Effective income tax rate Effective Income Tax Rate Reconciliation, Percent INTANGIBLE ASSETS AND GOODWILL Goodwill and Intangible Assets Disclosure [Text Block] Contract Balances Contract with Customer, Asset and Liability [Table Text Block] Revenue, Initial Application Period Cumulative Effect Transition [Table] Revenue, Initial Application Period Cumulative Effect Transition [Table] 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] Revenue, Initial Application Period Cumulative Effect Transition [Line Items] Revenue, Initial Application Period Cumulative Effect Transition [Line Items] Deferred commission costs, amortization period Capitalized Contract Cost, Amortization Period Contract with customer, revenue recognized Contract with Customer, Liability, Revenue Recognized subscription term Revenue, Subscription Term Revenue, Subscription Term Revenue, remaining performance obligation, amount Revenue, Remaining Performance Obligation, Amount Revenue, remaining performance obligation, expected timing of satisfaction, period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Earnings Per Share [Abstract] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Stock options Share-based Payment Arrangement, Option [Member] Stock awards Restricted Stock [Member] Potential shares to be issued from ESPP Shares Issued Under Employee Stock Purchase Plan [Member] Shares Issued Under Employee Stock Purchase Plan [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Number of anti-dilutive shares Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 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] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Cost of service revenue Cost Of Service Revenue [Member] Cost Of Service Revenue [Member] Research and development Research and Development Expense [Member] Sales and marketing Selling and Marketing Expense [Member] General and administrative General and Administrative Expense [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Stock-based compensation expense Share-based Payment Arrangement, Expense Fair Value Disclosures [Abstract] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Cash and Cash Equivalents Cash and Cash Equivalents [Member] Short-term Investments Short-term Investments [Member] Long-term Debt Long-term Investments [Member] Long-term Investments [Member] Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Cash Cash [Member] Money market funds Money Market Funds [Member] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Treasury securities US Treasury Securities [Member] Corporate bonds Corporate Debt Securities [Member] Commercial paper Commercial Paper [Member] Commercial paper US States and Political Subdivisions Debt Securities [Member] Asset backed securities Asset-backed Securities [Member] Agency bond Other Debt Obligations [Member] 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] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents, fair value Cash and Cash Equivalents, Fair Value Disclosure Amortized cost Debt Securities, Available-for-sale, Amortized Cost Accumulated gross unrealized gain, before tax Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Accumulated gross unrealized loss, before tax Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Debt securities, available-for-sale Debt Securities, Available-for-sale Cash, cash equivalents and debt securities available-for-sale, amortized cost Cash, Cash Equivalents and Debt Securities Available-for-sale, Amortized Cost Cash, Cash Equivalents and Debt Securities Available-for-sale Cash, cash equivalents and debt securities available-for-sale Cash, Cash Equivalents and Debt Securities Available-for-sale Cash, Cash Equivalents and Debt Securities Available-for-sale Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Due within one year Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value Due after one year Debt Securities Available-for-sale, Due After One Year Available-For-Sale Securities, Due After One Year Total Goodwill [Roll Forward] Goodwill [Roll Forward] Balance at March 31, 2019 Goodwill Foreign currency translation Goodwill, Foreign Currency Translation Gain (Loss) Balance at June 30, 2019 Statement of Cash Flows [Abstract] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Net loss Net Income (Loss) Attributable to Parent Adjustments to reconcile net loss to net cash (used in) provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation Depreciation Amortization of intangible assets Amortization of Intangible Assets Amortization of capitalized software Capitalized Computer Software, Amortization Amortization of debt discount and issuance costs Amortization of Debt Issuance Costs and Discounts Amortization of deferred sales commission costs Amortization of Deferred Sales Commissions Operating lease expense, net of accretion Operating Lease Expense, Net Of Accretion Operating Lease Expense, Net Of Accretion Non-cash lease expenses Lease, Non-Cash Lease Expense Lease, Non-Cash Lease Expense Stock-based compensation Share-based Payment Arrangement, Noncash Expense Other Other Noncash Expense Changes in assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable, net Increase (Decrease) in Accounts Receivable Deferred sales commission costs Increase (Decrease) in Deferred Charges Other current and non-current assets Increase (Decrease) in Other Operating Assets Accounts payable and accruals Increase (Decrease) in Accounts Payable and Accrued Liabilities Deferred revenue Increase (Decrease) in Deferred Revenue Net cash (used in) provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Purchase of businesses Payments to Acquire Businesses, Net of Cash Acquired Capitalized software development costs Payments for Software Proceeds from maturities of investments Proceeds from Sale, Maturity and Collection of Short-term Investments Proceeds from sales of investments Proceeds from Sale and Maturity of Marketable Securities Purchases of investments Payments to Acquire Marketable Securities Net cash provided by investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Finance lease payments Finance Lease, Principal Payments Finance lease payments Repayments of Long-term Capital Lease Obligations Tax-related withholding of common stock Payment, Tax Withholding, Share-based Payment Arrangement Proceeds from issuance of common stock under employee stock plans Proceeds from Stock Plans Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Effect of exchange rate changes on cash Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Net (decrease) increase in cash and cash equivalents, and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash, cash equivalents, and restricted cash at the beginning of the period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, cash equivalents, and restricted cash at the end of the period Supplemental cash flow information Supplemental Cash Flow Information [Abstract] Income taxes paid Income Taxes Paid Income Statement [Abstract] Statement [Table] Statement [Table] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Service Service [Member] Product Product [Member] Statement [Line Items] Statement [Line Items] Total revenue Revenue from Contract with Customer, Excluding Assessed Tax Cost of revenue and operating expenses: Operating Expenses [Abstract] Cost of goods and services sold Cost of Goods and Services Sold Research and development Research and Development Expense Sales and marketing Selling and Marketing Expense General and administrative General and Administrative Expense Total operating expenses Operating Expenses Loss from operations Operating Income (Loss) Other (expense) income, net Nonoperating Income (Expense) Loss before provision for income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Provision for income taxes Income Tax Expense (Benefit) Net loss Net loss per share: Basic and diluted (in dollars per share) Earnings Per Share, Basic and Diluted Weighted-average common shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic and diluted (in shares) Weighted Average Number of Shares Outstanding, Basic and Diluted Assets and Liabilities, Lessee Assets and Liabilities, Lessee [Table Text Block] Assets and Liabilities, Lessee [Table Text Block] Lease, Cost Lease, Cost [Table Text Block] Lessee, Operating Lease, Liability, Maturity Lessee, Operating Lease, Liability, Maturity [Table Text Block] Remaining 2020 Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year 2021 Lessee, Operating Lease, Liability, Payments, Due Year Two 2022 Lessee, Operating Lease, Liability, Payments, Due Year Three 2023 Lessee, Operating Lease, Liability, Payments, Due Year Four 2024 Lessee, Operating Lease, Liability, Payments, Due Year Five Thereafter Lessee, Operating Lease, Liability, Payments, Due after Year Five Total lease payments Lessee, Operating Lease, Liability, Payments, Due Less: imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Present value of lease liabilities Operating Lease, Liability NET LOSS PER SHARE Earnings Per Share [Text Block] Stock Option Rollforward Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Stock options outstanding at the beginning of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Options granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures Options exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Options canceled and forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Options outstanding at the end of the period (in shares) Weighted-average fair value of grants during the period (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Total intrinsic value of options exercised during the period Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Weighted-average remaining recognition period at period-end (in years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Stock Award Rollforward Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] Stock awards outstanding at the beginning of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Stock awards granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Stock awards vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Stock awards canceled and forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Stock awards outstanding at the end of the period: (in shares) Weighted-average fair value of grants during the period (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 Weighted-average remaining recognition period at period-end (in years) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms Total unrecognized compensation expense at period-end Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Statement of Comprehensive Income [Abstract] Net loss Other comprehensive loss, net of tax Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent [Abstract] Unrealized gain on investments in securities Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax Foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent 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] Convertible Debt Convertible Debt [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Convertible Senior Notes Convertible Senior Notes [Member] Convertible Senior Notes [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Principal Debt Instrument, Face Amount Unamortized debt discount Debt Instrument, Unamortized Discount Unamortized issuance costs Debt Issuance Costs, Net Net carrying amount Long-term Debt Option Indexed to Issuer's Equity, Type [Axis] Option Indexed to Issuer's Equity, Type [Axis] Option Indexed to Issuer's Equity, Type [Domain] Option Indexed to Issuer's Equity, Type [Domain] Call Option Call Option [Member] Debt instrument, face value Debt instrument, interest rate Debt Instrument, Interest Rate, Stated Percentage Proceeds from issuance of debt Proceeds from Debt, Net of Issuance Costs Debt instrument, convertible, conversion ratio Debt Instrument, Convertible, Conversion Ratio Common stock, par value per share (in dollars per share) Common Stock, Par or Stated Value Per Share Debt instrument, convertible, conversion price (in dollars per share) Debt Instrument, Convertible, Conversion Price Debt instrument, redemption price, percentage Debt Instrument, Redemption Price, Percentage Debt instrument, convertible, threshold percentage of stock price trigger Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger Debt instrument, convertible, threshold trading days Debt Instrument, Convertible, Threshold Trading Days Debt instrument, convertible, threshold consecutive trading days Debt Instrument, Convertible, Threshold Consecutive Trading Days Debt instrument, strike price per share (in dollars per share) Option Indexed to Issuer's Equity, Strike Price Debt instrument, initial cap price per share (in dollars per share) Option Indexed To Issuer's Equity, Cap Price Option Indexed To Issuer's Equity, Cap Price Option indexed to issuer's equity, indexed shares (in shares) Option Indexed to Issuer's Equity, Indexed Shares Payments for capped call transactions Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Subsequent Adjustments Statement of Stockholders' Equity [Abstract] 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 Other Comprehensive Loss AOCI Attributable to Parent [Member] Accumulated Deficit Retained Earnings [Member] ASU 2016-09 Accounting Standards Update 2016-09 [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning balance (shares) Shares, Issued Beginning balance Stockholders' Equity Attributable to Parent Issuance of common stock under stock plans, less withholding (shares) Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture Issuance of common stock under stock plans, less withholding Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture Stock-based compensation expense APIC, Share-based Payment Arrangement, Increase for Cost Recognition Unrealized investment gain (loss) Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Foreign currency translation adjustment Adjustment from adoption of ASU 2016-9 Cumulative Effect of New Accounting Principle in Period of Adoption Ending balance (shares) Ending balance Fair Value Measurements Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Contractual Maturity of Investments Investments Classified by Contractual Maturity Date [Table Text Block] Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] 2017 Repurchase Plan 2017 Repurchase Plan [Member] 2017 Repurchase Plan [Member] Authorized repurchase amount Stock Repurchase Program, Authorized Amount Remaining authorized repurchase amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Stock repurchased during period (in shares) Stock Repurchased During Period, Shares Accounting Policies [Abstract] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Debt instrument, fair value Debt Instrument, Fair Value Disclosure Numerator: Earnings Per Share Reconciliation [Abstract] Net loss available to common stockholders Denominator: Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] Common shares - basic and diluted (in shares) Net loss per share Earnings Per Share, Basic and Diluted [Abstract] Fiscal Period Fiscal Period, Policy [Policy Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Principles of Consolidation Consolidation, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Reclassifications and Other Changes Reclassification, Policy [Policy Text Block] Accounting Policies and Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Revenue Recognition Revenue from Contract with Customer [Policy Text Block] CONVERTIBLE SENIOR NOTES AND CAPPED CALL Debt Disclosure [Text Block] Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Contract assets Deferred revenue - current Contract with Customer, Liability, Current Deferred revenue - non-current Contract with Customer, Liability, Noncurrent Contractual interest expense Interest Expense, Debt, Excluding Amortization Amortization of debt discount Amortization of Debt Discount (Premium) Amortization of issuance costs Amortization of Debt Issuance Costs Total interest expense Interest Expense, Debt REVENUE RECOGNITION Revenue from Contract with Customer [Text Block] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] Americas (principally US) Americas [Member] Europe (principally UK) Europe [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Total revenue INCOME TAXES Income Tax Disclosure [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Number of reportable segments Number of Reportable Segments Subsequent Events [Abstract] Subsequent Event [Table] Subsequent Event [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Property Held Under Operating Lease Property Held Under Operating Lease [Member] Property Held Under Operating Lease [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Wayecell Pte. Ltd. Wayecell Pte. Ltd. [Member] Wayecell Pte. Ltd. [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Area of real estate property Area of Real Estate Property Number of building stories Number of Building Stories Number of Building Stories Number of renewal terms Lessee, Operating Lease, Number Of Renewal Terms Lessee, Operating Lease, Number Of Renewal Terms Base rent Operating Leases, Rent Expense, Monthly Operating Leases, Rent Expense, Monthly Annual percentage increase in base rent Operating Leases, Rent Expense, Annual Rate Increase Operating Leases, Rent Expense, Annual Rate Increase Tenant improvements Lessee, Operating Lease, Tenant Improvement Allowance Lessee, Operating Lease, Tenant Improvement Allowance Security deposit Security Deposit Business combination, consideration transferred Business Combination, Consideration Transferred Payments to acquire business Payments to Acquire Businesses, Gross Business combination, value of stock issued Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Business acquisition, number of shares issued (in shares) Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Convertible Debt Convertible Debt [Table Text Block] Interest Income and Interest Expense Disclosure Interest Income and Interest Expense Disclosure [Table Text Block] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] 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] Technology Patented Technology [Member] Customer relationships Customer Relationships [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Gross Carrying Amount Finite-Lived Intangible Assets, Gross Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Statement of Financial Position [Abstract] ASSETS Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Short-term investments Short-term Investments Accounts receivable, net Deferred sales commission costs Capitalized Contract Cost, Net, Current Other current assets Other Assets, Current Total current assets Assets, Current Property and equipment, net Property, Plant and Equipment, Net Operating lease, right-of-use assets Operating Lease, Right-of-Use Asset Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Goodwill Long-term investments Long-term Investments Restricted cash Restricted Cash Deferred sales commission costs, non-current Capitalized Contract Cost, Net, Noncurrent Other assets Other Assets, Noncurrent Total assets Assets LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity [Abstract] Current liabilities: Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Accrued compensation Employee-related Liabilities, Current Accrued taxes Accrued Income Taxes, Current Operating lease liabilities, current Operating Lease, Liability, Current Deferred revenue Other accrued liabilities Other Accrued Liabilities, Current Total current liabilities Liabilities, Current Operating lease liabilities, non-current Operating Lease, Liability, Noncurrent Convertible senior notes, net Long-term Debt, Excluding Current Maturities Other liabilities, non-current Other Liabilities, Noncurrent Total liabilities Liabilities Commitments and contingencies (Note 7) Commitments and Contingencies Stockholders' equity: Stockholders' Equity Attributable to Parent [Abstract] Common stock Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated deficit Retained Earnings (Accumulated Deficit) Total stockholders' equity Total liabilities and stockholders' equity Liabilities and Equity Assets Operating Lease, Right-Of-Use Asset, Lessee [Abstract] Operating Lease, Right-Of-Use Asset, Lessee [Abstract] Operating lease, right-of-use assets Liabilities Operating Lease, Lease Liability, Lessee [Abstract] Operating Lease, Lease Liability, Lessee [Abstract] Operating lease liabilities, current Operating lease liabilities, non-current Total operating lease liabilities FAIR VALUE MEASUREMENTS Fair Value Disclosures [Text Block] DESCRIPTION OF BUSINESS Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Accounting Standards Update 2016-02 Accounting Standards Update 2016-02 [Member] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Schedule of Stock Option Expense and Activity Share-based Payment Arrangement, Activity [Table Text Block] SUBSEQUENT EVENTS Subsequent Events [Text Block] STOCK-BASED COMPENSATION Shareholders' Equity and Share-based Payments [Text Block] Americas (principally US) Europe (principally UK) Property and equipment, net RIGHT-OF-USE ASSETS AND LEASES Lessee, Operating Leases [Text Block]