Statistical Measurement [Domain] Statistical Measurement [Domain] Accrued payroll taxes and benefits Accrued Payroll Taxes And Employee Benefits, Current Accrued Payroll Taxes And Employee Benefits, Current Automatic renewal term (in years) Lessor, Operating Lease, Renewal Term Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Settled Litigation Settled Litigation [Member] Term of pilot phase, up to (in months) Pilot Phase, Term Pilot Phase, Term Award Timing Predetermined Award Timing Predetermined [Flag] Related Party Transaction [Axis] Related Party Transaction [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Automatic increase to shares reserve for future issuance, percent of total shares outstanding Common Stock, Automatic Increase To Capital Shares Reserved For Future Issuance, Percent Of Total Shares Outstanding Common Stock, Automatic Increase To Capital Shares Reserved For Future Issuance, Percent Of Total Shares Outstanding Entity File Number Entity File Number Additional Paid-In Capital Additional Paid-in Capital [Member] Other Assets Other Noncurrent Assets [Member] Impairment of Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Tabular List, Table Tabular List [Table Text Block] Leases [Abstract] Increases for tax positions related to the prior year Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Recently Issued Accounting Standards Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] Accounts payable Increase (Decrease) in Accounts Payable Federal research and development credit Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount Shares withheld related to net share settlement of equity awards Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Gross Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Net loss per share attributable to Class A and B common stockholders, basic (in dollars per share) Basic net loss per Class A and B common shares (in dollars per share) Earnings Per Share, Basic Adjustment to Compensation: Adjustment to Compensation [Axis] Related Party Transactions Related Party Transactions Disclosure [Text Block] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Commercial paper Commercial paper Commercial Paper [Member] Shares reserved for future issuance (in shares) Common Stock, Capital Shares Reserved for Future Issuance Revenue Revenue from Contract with Customer [Text Block] Stock based compensation Deferred Tax Assets, Tax Deferred Expense, 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Obligation, Amount Schedule of Cash Equivalents and Available-For-Sale Marketable Securities and Balance Sheet Classification Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] Adjustment to Compensation, Amount Adjustment to Compensation Amount Geographic concentration risk, percentage Customer concentration risk, percentage Concentration Risk, Percentage Principles of Consolidation Consolidation, Policy [Policy Text Block] Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Stock options Share-Based Payment Arrangement, Option [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Research and Development Expenses Research and Development Expense, Policy [Policy Text Block] Category of Item Purchased [Axis] Category of Item Purchased [Axis] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Litigation settlement, amount awarded from other party Litigation Settlement, Amount Awarded from Other Party Percent Effective Income Tax Rate Reconciliation, Percent [Abstract] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Total stockholders’ equity Beginning Balance, Amount Ending Balance, Amount Equity, Attributable to Parent Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-Sale [Table] Other comprehensive (loss) income Other Comprehensive Income (Loss), Net of Tax [Abstract] Insider Trading Policies and Procedures [Line Items] Stock-based compensation expense Total stock-based compensation expense Share-Based Payment Arrangement, Expense Schedule of Property and Equipment Property, Plant and Equipment [Table Text Block] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Current assets Assets, Current [Abstract] Options cancelled (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, 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and exercisable at end of period (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price AFS, Total Fair Value Debt Securities, Available-for-Sale, Unrealized Loss Position Schedule of Maturities of Operating Lease Liabilities Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Restricted Stock Restricted Stock [Member] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation 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] Meals and entertainment Effective Income Tax Rate Reconciliation, Nondeductible Expense, Meals and Entertainment, Amount Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Total operating lease liabilities Total operating lease liabilities Operating Lease, Liability Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Loss before provision for income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Related party balance included in deferred revenue Increase (Decrease) In Contract With Customer, Liability, Related Parties Increase (Decrease) In Contract With Customer, Liability, Related Parties Other long-term liabilities Other Liabilities, Noncurrent Gain contingency, compensatory damages sought Gain Contingency, Unrecorded Amount Goodwill, impairment Goodwill, Impairment Loss Statement of Stockholders' Equity [Abstract] Schedule of Cash Flow, Supplemental Disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount Fiscal 2029 Lessee, Operating Lease, Liability, to be Paid, Year Three Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Accrued bonus Accrued Bonuses, Current Total Comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Name Measure Name Schedule of Components of Net Loss Before Income Taxes Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] AFS Marketable Securities Maturities, Within one year, Fair Value Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Texas TEXAS Domestic Income (Loss) from Continuing Operations before Income Taxes, Domestic Summary of Effects of Stock-Based Compensation Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Operating lease liabilities, current Lease liabilities, current Operating Lease, Liability, Current Document Fiscal Period Focus Document Fiscal Period Focus Award Timing Method Award Timing Method [Text Block] Litigation Case [Domain] Litigation Case [Domain] Related party balances included in accounts payable Increase (Decrease) in Accounts Payable, Related Parties Award Type [Axis] Award Type [Axis] Deferred revenue, non-current Contract with Customer, Liability, Noncurrent Total assets Assets Software Development Costs Research, Development, and Computer Software, Policy [Policy Text Block] Stock-Based Compensation Share-Based Payment Arrangement [Policy Text Block] Trading Symbol Trading Symbol Fiscal 2030 Lessee, Operating Lease, Liability, to be Paid, Year Four RSUs 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 Geographical [Domain] Geographical [Domain] Change in valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Revenue commitment, fiscal year 2021 Revenue Commitment, Year Two Revenue Commitment, Year Two Income Taxes Income Tax, Policy [Policy Text Block] Entity Address, City or Town Entity Address, City or Town Operating lease liability Deferred Tax Assets, Operating Lease Liability Deferred Tax Assets, Operating Lease Liability Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Federal research and development credit Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent Non-cash restructuring expense Business Exit Costs Business Exit Costs Annual Bonus Program And Retention Bonus Program Annual Bonus Program And Retention Bonus Program [Member] Annual Bonus Program And Retention Bonus Program Enel Enel Global Services S.R.L And Any Involved Corporate Affiliates ("Enel") [Member] Enel Global Services S.R.L And Any Involved Corporate Affiliates ("Enel") Total deferred tax assets Deferred Tax Assets, Net of Valuation Allowance Concentration Risk Type [Axis] Concentration Risk Type [Axis] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Income Statement Location [Domain] Statement of Income Location, Balance [Domain] RSUs Restricted Stock Units (RSUs) [Member] Severance Costs Severance Costs Number of phases Lessee, Operating Lease, Number Of Phases Lessee, Operating Lease, Number Of Phases Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Right-of-use assets obtained in exchange for lease obligations (including remeasurement of right-of-use assets and lease liabilities due to changes in the timing of receipt of lease incentives) Right-of-use assets obtained in exchange for lease obligations (including remeasurement of right-of-use assets and lease liabilities due to changes in the timing of receipt of lease incentives) Right-Of-Use Asset Obtained In Exchange For Operating Lease Liability, Including Remeasurement Of Right-Of-Use Asset And Operating Lease Liability From Changes In Timing Of Lease Incentive Receipt Right-Of-Use Asset Obtained In Exchange For Operating Lease Liability, Including Remeasurement Of Right-Of-Use Asset And Operating Lease Liability From Changes In Timing Of Lease Incentive Receipt Entity Emerging Growth Company Entity Emerging Growth Company Long-lived assets, impairment Impairment, Long-Lived Asset, Held-for-Use Entity Common Stock, Shares Outstanding (in shares) Entity Common Stock, Shares Outstanding Initial offering period (in months) Share-Based Compensation Arrangement By Share-based Payment Award, Consecutive Offering Period Share-Based Compensation Arrangement By Share-based Payment Award, Consecutive Offering Period Costs to obtain and fulfill a contract Sales commissions, recognized as deferred costs Capitalized Contract Cost, Net Right-of-use assets obtained in exchange for lease obligations (including remeasurement of right-of-use assets and lease liabilities due to changes in the timing of receipt of lease incentives) Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-Sale [Line Items] Balance at beginning of period (in shares) Balance at end of period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] State tax expense—net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Income Tax Examination [Line Items] Income Tax Examination [Line Items] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Revenue commitment, fiscal year 2023 Revenue Commitment, Year Four Revenue Commitment, Year Four Related Party Related Party [Member] Common stock, shares outstanding (in shares) Beginning Balance, shares (in shares) Ending Balance, shares (in shares) Common Stock, Shares, Outstanding Cloud Hosting Services Cloud Hosting Services [Member] Cloud Hosting Services Schedule of Provision for Income Tax Expenses Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Plan Name [Axis] Plan Name [Axis] Property and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Document Information [Table] Document Information [Table] PEO PEO [Member] Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Accrued vacation Accrued Vacation, Current Summary of Available-For-Sale Marketable Securities by Contractual Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Supplemental disclosures of non-cash investing and financing activities: Noncash Investing and Financing Items [Abstract] Interest income Investment Income, Interest Current expense Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Deferred tax assets, increase in valuation allowance Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Number of shares purchased (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period United States UNITED STATES Changes in operating assets and liabilities Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Issuance of Class A common stock upon exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Change in valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Customer Two Customer Two [Member] Customer Two Depreciation Deferred Tax Liabilities, Property, Plant and Equipment Expected volatility Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Accumulated Deficit Retained Earnings [Member] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Income Tax Authority [Axis] Income Tax Jurisdiction [Axis] Number of RSUs Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Schedule of Accrued and Other Current Liabilities Schedule of Accrued Liabilities [Table Text Block] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Share-Based Payment Arrangement [Abstract] Cash, cash equivalents and restricted cash at beginning of period Cash, cash equivalents and restricted cash at end of period Total cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Provision for income taxes Provision for income taxes Income Tax Expense (Benefit) AFS, 12 Months or Greater, Fair Value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Class B Common Stock Common Class B [Member] Accrued taxes payable Taxes Payable, Current Accrued liabilities, warranties Standard Product Warranty Accrual Accrued general expenses Accrued General Expenses, Current Accrued General Expenses, Current Document Information [Line Items] Document Information [Line Items] Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Debt Securities, Available-For-Sale, Excluding Money Market Accounts Debt Securities, Available-For-Sale, Excluding Money Market Accounts [Member] Debt Securities, Available-For-Sale, Excluding Money Market Accounts Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Software Licenses Software Licenses [Member] Software Licenses Product and Service [Domain] Product and Service [Domain] Remaining amount committed Long-Term Purchase Commitment, Remaining Amount Committed Long-Term Purchase Commitment, Remaining Amount Committed Available-for-sale marketable securities: Debt Securities, Available-for-Sale [Abstract] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Customer Concentration Risk Customer Concentration Risk [Member] Prioritized engineering services Engineering Services [Member] Engineering Services Supply Commitment [Table] Long-Term Purchase Commitment [Table] Property and equipment-gross Property, Plant and Equipment, Gross Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Restructuring Restructuring and Related Activities Disclosure [Text Block] Non-cash operating lease cost Operating Lease, Right-of-Use Asset, Periodic Reduction Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Proceeds from exercise of Class A common stock options Proceeds from Stock Options Exercised City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Federal Income Tax Paid, Federal, after Refund Received All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Vested and expected to vest at end of period (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Accrued and other current liabilities Accrued and other current liabilities Accrued Liabilities, Current Capitalized software development costs Payments to Develop Software Other permanent items Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Deferred tax liabilities Deferred Tax Liabilities, Gross [Abstract] Unvested Balance at beginning of period (in shares) Unvested Balance at end of period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Commitments and Contingencies Disclosure [Abstract] Vesting of early exercised Class A common stock options APIC, Share-Based Payment Arrangement, Increase For Stock Options Early Exercised APIC, Share-Based Payment Arrangement, Increase For Stock Options Early Exercised Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] General and administrative General and Administrative Expense Unrecognized compensation cost Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Net cash used in operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Number of office towers Lessor, Operating Lease, Number Of Office Towers Lessor, Operating Lease, Number Of Office Towers The Reckstin Family Trust v. C3.ai, Inc. The Reckstin Family Trust v. C3.ai, Inc. [Member] The Reckstin Family Trust v. C3.ai, Inc. Related Party Transactions [Abstract] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Total cash equivalents and available-for-sale marketable securities, Gross Unrealized Gain Cash, Cash Equivalents And Available-For-Sale Debt Securities, Accumulated Gross Unrealized Gain, Before Tax Cash, Cash Equivalents And Available-For-Sale Debt Securities, Accumulated Gross Unrealized Gain, Before Tax Property and equipment, useful life (in years) Useful Life (in months) Property, Plant and Equipment, Useful Life Subsequent Event Subsequent Event [Member] Schedule of Valuation Assumptions Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Total lease costs, net Lease, Cost Cost of revenue Cost of Sales [Member] Goodwill Goodwill Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Schedule of Components of Lease Costs and Supplemental Cash Flow, Balance Sheet, and Lease Terms Information Lease, Cost [Table Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Depreciation and amortization expense, related to property and equipment Depreciation Vested and expected to vest at end of 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 Money market funds Money Market Funds [Member] Prepaid Expenses and Other Current Assets Prepaid Expenses and Other Current Assets [Member] Federal Deferred Federal Income Tax Expense (Benefit) Equity Components [Axis] Equity Components [Axis] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Unrecognized Tax Benefits [Roll Forward] Sublease income Sublease Income Auditor Name Auditor Name Automatic conversion period, following the date Mr. Siebel no longer providing services (in months) Common Stock, Automatic Conversion Period Two, If Circumstances Met Common Stock, Automatic Conversion Period Two, If Circumstances Met Software Subscription Agreement Software Subscription Agreement [Member] Software Subscription Agreement Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Number of reportable segments Number of Reportable Segments Valuation assumptions: Valuation assumptions: Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions and Methodology [Abstract] Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost Advertising Expenses Advertising Cost [Policy Text Block] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Other Performance Measure, Amount Other Performance Measure, Amount Weighted Average Exercise Price Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Entity Address, State or Province Entity Address, State or Province Marketable Securities Marketable Securities, Policy [Policy Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Security, Excluded EPS Calculation [Table] Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Related Party [Domain] Related and Nonrelated Parties [Domain] Total current liabilities Liabilities, Current Amount Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] Number of positions eliminated, period percent Restructuring and Related Cost, Number of Positions Eliminated, Period Percent Litigation Status [Axis] Litigation Status [Axis] Long-term Purchase Commitment, Category of Item Purchased [Domain] Long-Term Purchase Commitment, Category of Item Purchased [Domain] Individual: Individual [Axis] Vesting [Axis] Vesting [Axis] 401(k) matching contributions Defined Contribution Plan, Cost Restricted cash Restricted Cash Income Tax Authority [Domain] Income Tax Jurisdiction [Domain] Document Annual Report Document Annual Report Research and development Research and Development Expense [Member] Additional paid-in capital Additional Paid in Capital, Common Stock Weighted Average Remaining Contractual Life (years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Term [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Term [Abstract] Net cash provided by (used in) investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Revenue expected to be recognized from remaining performance obligations, period (in months) Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Document Fiscal Year Focus Document Fiscal Year Focus Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Right-of-use assets Operating Lease, Right-of-Use Asset Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Total provision for income taxes Effective Income Tax Rate Reconciliation, Percent Entity Interactive Data Current Entity Interactive Data Current Purchase commitment, incurred cost Long-Term Purchase Commitment, Incurred Cost Long-Term Purchase Commitment, Incurred Cost Operating lease costs Operating Lease, Cost Other Other Employee-related Liabilities, Current Plan Name [Domain] Plan Name [Domain] Unrecognized compensation cost, weighted-average recognition period (in years) Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Related party balances included in accounts receivable Increase (Decrease) in Accounts Receivable, Related Parties Issuance of Class A common stock upon exercise of stock options (in shares) Options exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Valuation allowance Deferred tax assets, valuation allowance Deferred Tax Assets, Valuation Allowance Deferred revenue Deferred Tax Assets, Deferred Income Purchase period (in months) Share-Based Compensation Arrangement By Share-based Payment Award, Purchase Period Share-Based Compensation Arrangement By Share-based Payment Award, Purchase Period Equity [Abstract] Vesting of early exercised stock options Share-Based Payment Arrangement, Vesting Of Early Exercised Stock Options Share-Based Payment Arrangement, Vesting Of Early Exercised Stock Options Deferred Revenue, Revenue Recognition, and Costs to Obtain and Fulfill a Contract Revenue from Contract with Customer [Policy Text Block] Vested and exercisable at end of period Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value North America North America [Member] Stock-based compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Amount 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] U.S. treasury securities U.S. treasury securities US Treasury Securities [Member] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Net operating losses Deferred Tax Assets, Operating Loss Carryforwards Total stock-based compensation expense excluding restructuring Share-Based Payment Arrangement, Excluding Restructuring Charges, Expense Share-Based Payment Arrangement, Excluding Restructuring Charges, Expense Area under lease (in square feet) Lessee, Operating Lease, Area Under Lease Lessee, Operating Lease, Area Under Lease Federal Current Federal Tax Expense (Benefit) Property, Plant and Equipment by Type [Axis] Long-Lived Tangible Asset [Axis] Audit Information [Abstract] Audit Information [Abstract] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Number of positions eliminated Restructuring and Related Cost, Expected Number of Positions Eliminated Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Leases Lessee, Leases [Policy Text Block] Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Depreciation and amortization Depreciation, Depletion and Amortization Other assets, non-current Other Assets, Noncurrent Customer [Domain] Customer [Domain] Entity Central Index Key Entity Central Index Key PEO Name PEO Name Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Restructuring Expenses Costs Associated with Exit or Disposal Activities or Restructurings, Policy [Policy Text Block] Total cash equivalents and available-for-sale marketable securities, Gross Unrealized Loss Cash, Cash Equivalents And Available-For-Sale Debt Securities, Accumulated Gross Unrealized Loss, Before Tax Cash, Cash Equivalents And Available-For-Sale Debt Securities, Accumulated Gross Unrealized Loss, Before Tax Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Accounts Receivable Accounts Receivable [Policy Text Block] Impact of foreign operations Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount Unrecognized tax benefits, anticipated significant change over the next 12 months Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit Arrangement Duration Trading Arrangement Duration Share-based Payment Arrangement, Tranche One Share-Based Payment Arrangement, Tranche One [Member] Expected volatility, maximum Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum Computer equipment Computer Equipment [Member] Deferred revenue, current Contract with Customer, Liability, Current Prepaid expenses, other current assets and other assets Related party balanced included in prepaid expenses, other current assets and other assets Increase (Decrease) in Prepaid Expense and Other Assets Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Local Phone Number Local Phone Number Class of Stock [Domain] Class of Stock [Domain] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Unrecognized stock-based compensation expense, non-options Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Expected benefit at federal statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Share price (in dollars per share) Share Price Subsequent Event Type [Axis] Subsequent Event Type [Axis] Stock-Based Compensation Share-Based Payment Arrangement [Text Block] Total cash equivalents and available-for-sale marketable securities, Amortized Cost Cash, Cash Equivalents And Available-for-sale Debt Securities, Amortized Cost Cash, Cash Equivalents And Available-for-sale Debt Securities, Amortized Cost Assets Assets [Abstract] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Balance Sheet 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Subsequent Events [Text Block] Insider Trading Arrangements [Line Items] Netherlands NETHERLANDS Security Exchange Name Security Exchange Name Options cancelled (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Foreign Income Tax Paid, Foreign, after Refund Received Automatic conversion period, following the death or incapacity of Mr. Siebel (in months) Common Stock, Automatic Conversion Period One, If Circumstances Met Common Stock, Automatic Conversion Period One, If Circumstances Met Voting rights, number of votes for each share Common Stock, Voting Rights, Number Of Votes For Each Share Common Stock, Voting Rights, Number Of Votes For Each Share Suri V. Siebel Et Al., Rabasca V. Siebel Et Al., Vo V. Siebel Et Al, Lanfair V. Siebel Et Al. And Pankow V. Siebel Et Al. Suri V. Siebel Et Al., Rabasca V. Siebel Et Al., Vo V. Siebel Et Al, Lanfair V. Siebel Et Al. And Pankow V. Siebel Et Al. [Member] Suri V. Siebel Et Al., Rabasca V. Siebel Et Al., Vo V. Siebel Et Al, Lanfair V. Siebel Et Al. And Pankow V. Siebel Et Al. Total liabilities Liabilities Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Plan Plan [Member] Plan Capitalized software costs Capitalized Computer Software, Net Purchases of property and equipment included in accounts payable and accrued liabilities Capital Expenditures Incurred but Not yet Paid Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Increases for tax positions related to the current year Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Maturities and sales of investments Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale Operating expenses Operating Expenses [Abstract] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Statement [Line Items] Statement [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Amortized Cost Cash and Cash Equivalent Counterparty Name [Axis] Counterparty Name [Axis] Subsequent Event [Line Items] Subsequent Event [Line Items] Research Tax Credit Carryforward Research Tax Credit Carryforward [Member] Risk-free interest rate, maximum Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum Common Stock Common Stock [Member] RSUs vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Available-for-sale marketable securities: Estimated Fair Value AFS Marketable Securities Maturities, Total Fair Value Debt Securities, Available-for-Sale Tax Credit Carryforward, Name [Domain] Tax Credit Carryforward, Name [Domain] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Corporate debt securities Corporate debt securities Corporate Debt Securities [Member] Subsidiary, Sale of Stock [Line Items] Subsidiary, Sale of Stock [Line Items] Net decrease in cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Accrued professional services Accrued Professional Fees, Current Mexico MEXICO