Redeemable Noncontrolling Interest, Equity, Carrying Amount
Redeemable Noncontrolling Interest, Ending balance
Redeemable Noncontrolling Interest, Beginning balance
Redeemable noncontrolling interest
Redeemable Noncontrolling Interest, Equity, Carrying Amount, Total
Entity Address, City or Town
Entity Address, City or Town
Net income attributable to common stockholders - basic
Net Income (Loss) Available to Common Stockholders, Basic
Fair Value Disclosures [Abstract]
Net income per share attributable to common stockholders: (Note 10)
Earnings Per Share [Abstract]
Fair Value, Inputs, Level 1 [Member]
Quoted Prices in Active Markets for Identical Assets (Level 1 Inputs)
Distributions to redeemable noncontrolling interest holders
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests
Domestic Tax Authority [Member]
Domestic Tax Authority
Financing Activities
Net Cash Provided by (Used in) Financing Activities [Abstract]
Increase in borrowing capacity equal to percentage of four quarter EBDITA
Increase In Borrowing Capacity Equal To Percentage Of Four Quarter EBDITA
Increase in borrowing capacity equal to percentage of four quarter EBDITA.
Letter of credit facility
Long-Term Line of Credit
Long-Term Line of Credit, Total
Amendment Flag
Amendment Flag
Selling and Marketing Expense [Member]
Sales and Marketing Expense
Unpaid purchases of property and equipment, capitalized website development, capitalized internal-use software and capitalized hosting arrangements
Capital Expenditures Incurred but Not yet Paid
Wholesale [Member]
Wholesale [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized
Number of shares authorized for issuances
Finite-Lived Intangible Assets, Accumulated Amortization
Accumulated Amortization
Cost of Sales [Member]
Cost of Revenue
Accrued tax distributions to redeemable noncontrolling interest holders
Accrued Tax Distributions To Redeemable Noncontrolling Interest Holders Current
Accrued tax distributions to redeemable noncontrolling interest holders current.
Distributions to redeemable noncontrolling interest holders
Distributions to Redeemable Noncontrolling Interest Holders
Distributions to redeemable noncontrolling interest holders.
Decrease in accrued tax distributions to redeemable noncontrolling interest
Decrease In Accrued Tax Distributions To Redeemable Noncontrolling Interest
Decrease in accrued tax distributions to redeemable noncontrolling interest.
Payment of tax distributions to redeemable noncontrolling interest holders
Payment of tax distribution to redeemable noncontrolling interest holders
Payment of Tax Distribution to Redeemable Noncontrolling Interest Holders
Payment of tax distribution to redeemable noncontrolling interest holders.
Goodwill
Balance at June 30, 2021
Goodwill, Total
Balance at December 31, 2020
Goodwill
Deferred Income Tax Assets, Net
Deferred tax assets
Deferred Income Tax Assets, Net, Total
Operating Lease, Right-of-Use Asset
Operating lease right-of-use assets
Schedule of Finite-Lived Intangible Assets [Table Text Block]
Summary of Other Intangible Assets
Document Quarterly Report
Document Quarterly Report
Schedule of Long-Term Debt Instruments [Table]
Earnings Per Share, Policy [Policy Text Block]
Earnings Per Share
Option Indexed to Issuer's Equity [Axis]
Statement [Table]
Statement [Table]
Operating Lease, Liability, Noncurrent
Operating lease liabilities
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]
Change in accounting principle, accounting standards update, immaterial effect
Operating Lease, Payments
Cash paid for operating lease liabilities
Preferred Stock, Shares Outstanding
Preferred stock, shares outstanding
Preferred Stock, Shares Outstanding, Beginning Balance
Preferred Stock, Shares Outstanding, Ending Balance
Business Acquisition [Axis]
Business Acquisition
Debt Securities, Held-to-Maturity, Fair Value
Certificates of deposit due in one year or less, Estimated Fair Value
Debt Securities, Held-to-maturity, Fair Value, Total
Income Tax Authority [Domain]
Income Tax Authority
Accounting Standards Update 2019-12 [Member]
ASU 2019-12
Product and Service [Axis]
Product and Service
Conversion of Stock, Type of Stock Converted
Class of share converted to another class
Receivables offset by payments received in advance
Receivables Offset By Payments Received In Advance
Receivables offset by payments received In advance.
Share-Based Payment Arrangement, Option [Member]
Stock Options
Stock Options Outstanding
Concentration Risk Type [Axis]
Concentration Risk Type
Liabilities and Equity
Total liabilities, redeemable noncontrolling interest and stockholders’ equity
Plan Name [Domain]
Plan Name
Unbilled Receivables, Current
Unbilled accounts receivable
Weighted-average number of shares of common stock used in computing net income per share attributable to common stockholders:
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Denominator:
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]
Change in accounting principle, accounting standards update, adopted
Decrease in payments received in advance from third-party payment processor
Decrease In Payments Received In Advance From Third-Party Payment Processor
Decrease in payments received in advance from third-party payment processor.
Entity Incorporation, State or Country Code
Entity Incorporation, State or Country Code
State of incorporation
Income Statement [Abstract]
Non-US [Member]
International
Liabilities, Current
Total current liabilities
Contract with Customer, Asset, after Allowance for Credit Loss, Current
Deferred contract costs
Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total
Redeemable noncontrolling interest , accretion to redemption value
Noncontrolling Interest, Change in Redemption Value
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Earnings Per Share Basic [Line Items]
Contract with Customer, Asset, after Allowance for Credit Loss, Noncurrent, Total
Contract with Customer, Asset, after Allowance for Credit Loss, Noncurrent
Deferred contract costs, net of current portion
Comprehensive (loss) income attributable to redeemable noncontrolling interests
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest, Total
Comprehensive income (loss) attributable to redeemable noncontrollin interests
Business acquisition, option to acquire remaining percentage of interest
Business Acquisition Option To Acquire Remaining Percentage Of Voting Interests
Business acquisition option to acquire remaining percentage of voting interests.
Business Acquisition, Acquiree [Domain]
Business Acquisition, Acquiree
Fair Value, Recurring [Member]
Fair Value, Measurements, Recurring
Interest expense
Interest Expense
Interest Expense, Total
CarOffer.
Car Offer [Member]
Car Offer
Income Tax, Policy [Policy Text Block]
Income Taxes
Net income per share attributable to common stockholders:
Net income (loss) per share attributable to common stockholders.
Net Income (Loss) Per Share Attributable To Common Stockholders Abstract
Increase (Decrease) in Contract with Customer, Liability
Deferred revenue
Preferred Stock, Shares Authorized
Preferred stock, shares authorized
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table]
Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Table]
Entity Small Business
Entity Small Business
Number of Reportable Segments
Number of reportable segments
Acquisition of redeemable noncontrolling interest.
Acquisition Of Redeemable Noncontrolling Interest
Acquisition of a 51% interest in CarOffer, LLC
Summary of significant accounting policies.
Summary Of Significant Accounting Policies [Table]
Summary Of Significant Accounting Policies [Table]
Assets, Current
Total current assets
Property, Plant and Equipment [Line Items]
Property Plant And Equipment [Line Items]
Increase decrease in lease obligations.
Increase Decrease In Lease Obligations
Lease obligations
Depreciation and amortization expense
Cost Of Goods And Services Sold Depreciation Amortization And Impairment Expense
Cost of goods and services sold depreciation amortization and impairment expense.
Weighted Average Number of Shares Outstanding, Basic, Total
Weighted Average Number of Shares Outstanding, Basic
Basic
Weighted-average number of shares of common stock used in computing net income per share attributable to common stockholders — basic
Schedule of Accrued Expenses, Accrued Income Taxes and Other Current Liabilities
Schedule Of Accrued Liabilities And Other Current Liabilities Table [Text Block]
Schedule of accrued liabilities and other current liabilities.
Accretion of redeemable noncontrolling interest to redemption value
Redeemable Noncontrolling Interest Accretion to Redemption Value
Redeemable noncontrolling interest accretion to redemption value.
Schedule of Other Non-Current Liabilities
Other Noncurrent Liabilities [Table Text Block]
City Area Code
City Area Code
Gross trade accounts receivable from receivables in transit from the third-party payment processor
Accounts Receivable, before Allowance for Credit Loss, Current
Exercise of guarantee net loss
Exercise of Guarantee Net Loss
Exercise of guarantee net loss.
Line of credit facility unutilized commitment fee percentage
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage
Share-Based Payment Arrangement [Abstract]
Liabilities
Total liabilities
Document Period End Date
Document Period End Date
Guarantees
Guarantor Obligations, Maximum Exposure, Undiscounted
Vesting Agreement.
Vesting Agreement [Member]
Vesting Agreement
Schedule of Finite-Lived Intangible Assets [Table]
Schedule Of Finite Lived Intangible Assets [Table]
Construction in Progress [Member]
Construction in Progress
Payments to Acquire Restricted Certificates of Deposit
Invesments in certificates of deposit
Investments in certificates of deposit
Guarantee net loss
Guarantee Net Loss
Guarantee Net Loss
Increase (Decrease) in Contract with Customer, Asset
Deferred contract costs
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Summary of Operations by Segment and Geographical Area
Capitalized internal-use software
Software and Software Development Costs [Member]
Finite-Lived Intangible Asset, Expected Amortization, Year One
2022
Statistical Measurement [Axis]
Finite-Lived Intangible Asset, Expected Amortization, after Year Five
Thereafter
Assets
Assets
Total assets
Customer one.
Customer One [Member]
Customer One
Stock Issued During Period, Shares, Conversion of Convertible Securities
Conversion of common stock, shares issued
State and Local Jurisdiction [Member]
State
Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table]
Schedule Of Earnings Per Share Basic By Common Class [Table]
Software Development [Member]
Capitalized Website Development
Earnings Per Share, Diluted
Diluted
Earnings Per Share, Diluted, Total
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
Schedule of Potentially Dilutive Common Stock Equivalents Excluded from Calculation of Diluted Weighted-average Shares Outstanding
Closed tax year.
Closed Tax Year
Closed tax year
Entity Address, Postal Zip Code
Entity Address, Postal Zip Code
Document Fiscal Period Focus
Document Fiscal Period Focus
Restricted Cash
Restricted cash
Restricted Cash, Total
Cost of Goods and Services Sold
Cost of revenue
Cost of Goods and Services Sold, Total
Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block]
Organization and Business Description
Increase (Decrease) in Accounts Receivable
Accounts receivable, net
Revolving Credit Facility
Revolving Credit Facility [Member]
Preferred stock, $0.001 par value; 10,000,000 shares authorized; no shares issued and outstanding
Preferred Stock, Value, Issued, Total
Preferred Stock, Value, Issued, Beginning Balance
Preferred Stock, Value, Issued, Ending Balance
Preferred Stock, Value, Issued
APIC, Share-based Payment Arrangement, Increase for Cost Recognition, Total
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition
Stock–based compensation expense
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements
Dilutive effect of share equivalents resulting from stock options
Incremental Common Shares Attributable to Share-based Payment Arrangements, Total
Payments to Develop Software
Capitalization of website development costs
Net cash used in financing activities
Net cash provided by (used in) financing activities
Net Cash Provided by (Used in) Financing Activities
2024 Put Right
Two Thousand Twenty Four Put Right Member
Two Thousand Twenty Four Put Right Member.
Short-Term Debt, Type [Axis]
Significant accounting policies.
Significant Accounting Policies Policy [Text Block]
Significant Accounting Policies
Statement of Financial Position [Abstract]
Entity File Number
Entity File Number
Statement of Cash Flows [Abstract]
Exercise of guarantee
Exercise of Guarantee
exercise of guarantee.
Proceeds from Sale, Maturity and Collection of Investments
Maturities of certificates of deposit
Proceeds from Sale, Maturity and Collection of Investments, Total
Two Thousand Twenty Car Offer Equity Incentive Plans [Member]
Two thousand twenty car offer equity incentive plans.
2020 CO Plan
Geographical [Domain]
Geographical
Statistical Measurement [Domain]
Statement of Stockholders' Equity [Abstract]
Accrued Bonuses, Current
Accrued bonus
Class of Stock [Domain]
Class of Stock
Conversion of Stock, Shares Issued
Conversion of stock
Revenue Benchmark [Member]
Sales Revenue, Net
Revenue Recognition - Wholesale and Other Revenue and Inventory
Revenue from Contract with Customer [Policy Text Block]
Subsequent Events [Abstract]
Proceeds from Stock Options Exercised
Proceeds from exercise of stock options
Deferred Income Tax Expense (Benefit), Total
Deferred Income Tax Expense (Benefit)
Deferred taxes
Deferred Income Tax Liabilities, Net, Total
Deferred Income Tax Liabilities, Net
Deferred tax liabilities
Property, Plant and Equipment [Table Text Block]
Schedule of Property and Equipment, Net
Revenue from Contract with Customer [Text Block]
Revenue Recognition
Concentration Risk, Credit Risk, Policy [Policy Text Block]
Concentration of Credit Risk
Antidilutive Securities [Axis]
Antidilutive Securities
Held to maturity amortized cost.
Held To Maturity Amortized Cost
Held to maturity amortized cost
Line of credit facility maximum borrowing amount
Line of Credit Facility, Maximum Borrowing Capacity
Reserve for returns and cancellations current.
Reserve for Returns and Cancellations Current
Reserve for returns and cancellations
Preferred Stock, Par or Stated Value Per Share
Preferred stock, par value
Contract with Customer, Liability, Current
Deferred revenue
Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year
Remainder of 2021
Capitalized Contract Cost, Amortization
Amortization of deferred contract costs
Credit Facility [Domain]
Call Option
Call Option [Member]
Subsequent Events
Subsequent Events [Text Block]
Weighted Average Number of Shares Outstanding, Diluted
Diluted
Weighted-average number of shares of common stock used in computing net income per share attributable to common stockholders — diluted
Decrease in stock-based compensation expense
Decrease in Allocated Share Based Compensation Expense
Decrease in allocated share based compensation expense
Finite-Lived Intangible Assets, Major Class Name [Domain]
Finite-Lived Intangible Assets, Major Class Name
Credit Facility [Axis]
Subsequent Events, Policy [Policy Text Block]
Subsequent Event Considerations
General and Administrative Expense [Member]
General and Administrative
Other accrued expenses and other current liabilities.
Other Accrued Expenses And Other Current Liabilities
Other accrued expenses and other current liabilities
Current Fiscal Year End Date
Current Fiscal Year End Date
Depreciation
Depreciation
Depreciation, Total
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations
Cash, cash equivalents, and restricted cash at end of period
Cash, cash equivalents, and restricted cash at beginning of period
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations, Total
Other Assets, Noncurrent, Total
Other Assets, Noncurrent
Other non-current assets
Entity Address, Address Line One
Entity Address, Address Line One
Finite-Lived Intangible Assets by Major Class [Axis]
Finite-Lived Intangible Assets by Major Class
Document and entity information
Document And Entity Information [Table]
Document And Entity Information [Table]
Accrued Liabilities, Current [Abstract]
Supplemental Cash Flow Information [Abstract]
Supplemental disclosure of cash flow information:
Conversion of Stock, Description
Conversion of stock, description
Restricted Cash, Noncurrent
Restricted cash
Income Tax Expense (Benefit), Total
Income Tax Expense (Benefit)
Provision for income taxes
Income tax provision (benefit)
Open Tax Year
Open tax year
Income Tax Disclosure [Text Block]
Income Taxes
Preferred Stock, Shares Issued, Total
Preferred Stock, Shares Issued
Preferred stock, shares issued
Balance Sheet Location [Domain]
Other non-current liabilities
Other Sundry Liabilities, Noncurrent
Payments to Acquire Property, Plant, and Equipment
Purchases of property and equipment
Payments to Acquire Property, Plant, and Equipment, Total
Revenue, Remaining Performance Obligation, Amount
Performance obligation unsatisfied
Income Tax Disclosure [Abstract]
Change in Accounting Principle, Accounting Standards Update, Adoption Date
Change in accounting principle, accounting standards update, adoption date
Line of credit facility commitment fee percentage
Line of Credit Facility, Commitment Fee Percentage
Incremental common shares attributable to CarOffer incentive units and noncontrolling interest.
Incremental Common Shares Attributable To Car Offer Incentive Units And Noncontrolling Interest
Dilutive effect of share equivalents resulting from CarOffer incentive units and noncontrolling interest
Finance lease right-of-use assets.
Finance Lease Right Of Use Assets [Member]
Finance Lease Right-of-use Assets
Payments received in advance from third-party payment processor
Accrued Income Expenses and Other current Payment received in advance third party payment
Accrued Income Expenses and Other current Payment received in advance third party payment
Guarantee income
Guarantee Income
Guarantee income.
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures, Total
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures
Issuance of common stock upon vesting of restricted stock units
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV
Goodwill and Intangible Assets Disclosure [Abstract]
IMCO
Instant Cash Max Offer [Member]
Instant Cash Max Offer.
Share-Based Payment Arrangement [Policy Text Block]
Stock-Based Compensation
Guarantees, description
Guarantor Obligations, Term
Contract with Customer, Liability, Revenue Recognized
Revenue recognized
Fair Value of Financial Instruments
Financial Instruments Disclosure [Text Block]
Operating Income (Loss)
Total income from operations
Income from operations
Impairment of website development costs
Impairment of website development costs.
Impairment of Website Development Costs
Additional Paid in Capital, Common Stock
Additional paid-in capital
Additional Paid in Capital, Common Stock, Beginning Balance
Additional Paid in Capital, Common Stock, Ending Balance
Payments to Acquire Businesses, Net of Cash Acquired
Cash paid, net of cash acquired
Cash paid for acquisitions, net of cash acquired
Line of credit facility increased in maximum borrowing capacity
Line Of Credit Facility Increased in Maximum Borrowing Capacity
Line of credit facility increased in maximum borrowing capacity.
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period
Requisite service period
Concentration Risk Benchmark [Domain]
Concentration Risk Benchmark
Common Stock, Voting Rights
Right to voting
Entity Filer Category
Entity Filer Category
Undistributed earnings ratio used to calculate allocation to class of stock.
Undistributed Earnings Ratio Used To Calculate Allocation To Class Of Stock
Undistributed earnings ratio used to calculate allocation to class of stock
Option Indexed to Issuer's Equity, Type [Domain]
Operating Expenses
Total operating expenses
Entity Current Reporting Status
Entity Current Reporting Status
Goodwill, Foreign Currency Translation Gain (Loss)
Foreign currency translation adjustment
Customer Two
Customer Two [Member]
Customer two.
Asset Class [Domain]
Asset Class
Inventory, Net
Inventory, Net, Total
Inventory
Net (loss) income attributable to redeemable noncontrolling interest
Less: Net income (loss) attributable to redeemable noncontrolling interest
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest, Total
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest
Payment of withholding taxes on net share settlements of equity awards, Shares
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation
Employee tax withholding requirements and option costs due to net share settlement
CO Incentive Units
Car Offer Incentive Units [Member]
CarOffer incentive units.
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares
Vesting number of shares
Finite-Lived Intangible Assets, Net
Intangible assets, net
Net Carrying Amount
Finite-Lived Intangible Assets, Net, Beginning Balance
Finite-Lived Intangible Assets, Net, Ending Balance
Stockholders' Equity Attributable to Parent
Ending balance
Beginning balance
Total stockholders’ equity
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations
Impact of foreign currency on cash, cash equivalents, and restricted cash
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations, Total
Asset Class [Axis]
Asset Class
Entity Tax Identification Number
Entity Tax Identification Number
Income Statement Location [Axis]
Income Statement Location
Common Stock, Value, Issued, Total
Common Stock, Value, Issued, Beginning Balance
Common Stock, Value, Issued, Ending Balance
Common Stock, Value, Issued
Common stock
Retained Earnings (Accumulated Deficit), Total
Retained Earnings (Accumulated Deficit), Beginning Balance
Retained Earnings (Accumulated Deficit), Ending Balance
Retained Earnings (Accumulated Deficit)
Retained earnings
Equity Components [Axis]
Accumulated Other Comprehensive Income (Loss)
Accounting Standards Update [Domain]
Accounting Standards Update
Accounts Payable and Accrued Liabilities [Member]
Accrued Expenses, Accrued Income Taxes and Other Current Liabilities
Customer Relationships [Member]
Customer Relationships
Disaggregation of Revenue [Table]
Number of major customers.
Number Of Major Customers
Number of major customers
Entity Emerging Growth Company
Entity Emerging Growth Company
Schedule of Business Acquisitions, by Acquisition [Table]
Schedule Of Business Acquisitions By Acquisition [Table]
Operating Expenses [Abstract]
Operating expenses:
Letter of Credit Facility
Letter of Credit [Member]
Stock Issued During Period, Value, Conversion of Convertible Securities, Net of Adjustments, Total
Stock Issued During Period, Value, Conversion of Convertible Securities, Net of Adjustments
Conversion of common stock
Selling and Marketing Expense
Sales and marketing
Selling and Marketing Expense, Total
Depreciation, Depletion and Amortization, Nonproduction
Depreciation and amortization
Depreciation, Depletion and Amortization, Nonproduction, Total
Document Transition Report
Document Transition Report
Assets, Fair Value Disclosure
Total
Assets, Fair Value Disclosure, Total
Accrued Expenses, Accrued Income Taxes and Other Current Liabilities and Other Non-Current Liabilities
Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block]
Schedule of Accrued Expenses, Accrued Income Taxes and Other Current Liabilities
Depreciation, Depletion and Amortization
Depreciation and amortization
Depreciation, Depletion and Amortization, Total
Car Offer Incentive Units and Subject Units [Member]
CarOffer incentive units and subject units.
CarOffer Incentive Units and Subject Units
Schedule of Segment Reporting Information, by Segment [Table]
Schedule Of Segment Reporting Information By Segment [Table]
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures
Issuance of common stock upon vesting of restricted stock units, Shares
Commitments and Contingencies Disclosure [Text Block]
Commitments and Contingencies
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total
Accumulated Other Comprehensive Income (Loss), Net of Tax
Accounts receivable, net of allowance for doubtful accounts of $1,122 and $420, respectively
Accounts receivable, net
Accounts Receivable, after Allowance for Credit Loss, Current
Accounts Receivable, after Allowance for Credit Loss, Current, Total
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Amortization of deferred financing costs
Amortization of Debt Issuance Costs
Net income attributable to CarGurus, Inc.
Net Income (Loss) Attributable to Parent
Net income (loss)
Net loss
Net (loss) income
Operating Lease, Liability, Current
Operating lease liabilities
2021 CO Plan
Two Thousand Twenty One Car Offer Equity Incentive Plans [Member]
Two thousand twenty one car offer equity incentive plans.
CarOffer equity incentive plans.
Car Offer Equity Incentive Plans [Member]
2020 CO Plan
Additional Paid-in Capital [Member]
Additional Paid-in Capital
Revenue Commissioners, Ireland [Member]
Revenue Commissioners, Ireland
Line of credit facility maturity date
Line of Credit Facility, Expiration Date
Brand.
Brand [Member]
Brand
Redeemable noncontrolling interest.
Redeemable Noncontrolling Interest Policy [Text Block]
Redeemable Noncontrolling Interest
Entity Registrant Name
Entity Registrant Name
Loss contingent liabilities
Loss Contingent Liabilities
Loss contingent liabilities.
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax
Foreign currency translation adjustment
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total
Accounts Receivable, Allowance for Credit Loss, Current
Allowance for doubtful accounts
Cash and Cash Equivalents, at Carrying Value
Cash and cash equivalents
Cash and Cash Equivalents, at Carrying Value, Total
Cash and Cash Equivalents, at Carrying Value, Beginning Balance
Cash and Cash Equivalents, at Carrying Value, Ending Balance
Earnings Per Share [Text Block]
Earnings Per Share
Number of installment.
Number Of Installment
Number of Installment
Class of Stock [Axis]
Class of Stock
Share-based Payment Arrangement, Noncash Expense, Total
Share-Based Payment Arrangement, Noncash Expense
Stock-based compensation expense
Stock based compensation
Statement of Comprehensive Income [Abstract]
Property, Plant and Equipment, Net
Property and equipment, net
Property and equipment, net
Property, Plant and Equipment, Net, Beginning Balance
Property, Plant and Equipment, Net, Ending Balance
Total
Award Type [Domain]
Award Type
Statement [Line Items]
Statement [Line Items]
Title of 12(b) Security
Title of 12(b) Security
Finite-Lived Intangible Assets, Gross
Gross Carrying Amount
Finite-Lived Intangible Assets, Gross, Total
Increase (Decrease) in Accounts Payable
Accounts payable
Increase (Decrease) in Accounts Payable, Total
Common Stock [Member]
Common Stock
Net Cash Provided by (Used in) Operating Activities [Abstract]
Operating Activities
Equity Component [Domain]
Equity Component
Revenue from Contract with Customer, Excluding Assessed Tax
Revenue from Contract with Customer, Excluding Assessed Tax, Total
Total
Revenue
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest
Income before income taxes
Entity Address, State or Province
Entity Address, State or Province
Geographical [Axis]
Geographical
Income Tax Examination [Table]
Income Tax Examination [Table]
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect
Net increase in cash, cash equivalents, and restricted cash
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest
Consolidated comprehensive income
Document Type
Document Type
Cash paid for interest
Interest Paid, Excluding Capitalized Interest, Operating Activities
UNITED STATES
United States
United States
Entity Shell Company
Entity Shell Company
Inventory
Inventory
Increase (Decrease) in Inventories
Increase (Decrease) in Inventories, Total
Total
Total
Number of days guarantee period
Number Of Days Guarantee Period
Number of days guarantee period.
Segment Reporting Information [Line Items]
Segment Reporting Information [Line Items]
Advertising customers.
Advertising Customers [Member]
Advertising Customers
Fair Value of Financial Instruments, Policy [Policy Text Block]
Fair Value of Financial Instruments Including Cash, Cash Equivalents, and Investments
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]
Fair Value, Recurring and Nonrecurring [Table]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table]
Security Exchange Name
Security Exchange Name
Payments received in advance from third party payment processor
Payments received in advance from third-party payment
Payments received in advance from third-party payment
Goodwill and Intangible Assets, Policy [Policy Text Block]
Goodwill and Other Intangible Assets
Revenue from Contract with Customer [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Significant Accounting Policies [Text Block]
Summary of Significant Accounting Policies
Net Cash Provided by (Used in) Operating Activities
Net cash provided by operating activities
Other comprehensive income:
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Commitments and Contingencies Disclosure [Abstract]
Accrued income taxes
Accrued Income Taxes, Current
Employee tax withholding requirements for net share settlements of equity awards
Payment of withholding taxes and option costs on net share settlement of restricted stock units and stock options.
Payment Of Withholding Taxes And Option Costs On Net Share Settlement Of Restricted Stock Units And Stock Options
Total payments for employees' tax obligations to taxing authorities due to net share settlements and cashless exercises of options
Payment of withholding taxes on net share settlement of equity awards
Payment of withholding taxes on net share settlements of equity awards
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation
Restricted Stock Units (RSUs) [Member]
Restricted Stock Units
Restricted Stock Units Outstanding
Payments Received In Advance From (Payment Made to) Third Party Payment Processor
Payments received in advance from (payment made to) third party payment processor.
Payments made to third party payment processor
Increase (decrease) in accrued liabilities accrued income taxes and other liabilities.
Increase Decrease In Accrued Liabilities Accrued Income Taxes And Other Liabilities
Accrued expenses, accrued income taxes, and other liabilities
Consolidation, Policy [Policy Text Block]
Principles of Consolidation
New Accounting Pronouncements, Policy [Policy Text Block]
Recent Accounting Pronouncements Adopted
Common Stock, Shares, Outstanding
Ending balance, Shares
Beginning balance, Shares
Common stock, shares outstanding
Accretion of redeemable noncontrolling interest to redemption value
Accretion of Redeemable Noncontrolling Interest to Redemption Value
Accretion of redeemable noncontrolling interest to redemption value.
Business Acquisition [Line Items]
Business Acquisition [Line Items]
Change in Accounting Principle, Accounting Standards Update, Transition Option Elected [Extensible Enumeration]
Change in accounting principle, accounting standards update, transition option elected
Debt
Debt Disclosure [Text Block]
Fair Value, Inputs, Level 2 [Member]
Significant Other Observable Inputs (Level 2 Inputs)
Increase (decrease) in property and equipment
Property, Plant and Equipment, Gross, Period Increase (Decrease)
Property, Plant and Equipment, Gross, Period Increase (Decrease), Total
Net Cash Provided by (Used in) Investing Activities [Abstract]
Investing Activities
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
Summary of Estimated Amortization Expense of Intangible Assets
Commitments and contingencies (Note 8)
Commitments and Contingencies
Income Tax Authority, Name [Domain]
Income Tax Authority, Name
Common Stock, Shares, Issued, Total
Common Stock, Shares, Issued
Common stock, shares issued
Receivable Type [Axis]
Minimum
Minimum [Member]
Summary of significant accounting policies.
Summary Of Significant Accounting Policies [Line Items]
Summary Of Significant Accounting Policies [Line Items]
Income Tax Authority, Name [Axis]
Income Tax Authority, Name
Restricted Cash, Current
Restricted cash
Repayments of Lines of Credit
Repayment of line of credit
Accounting Standards Update [Axis]
Accounting Standards Update
Common Class B [Member]
Class B Common Stock
Depreciation and amortization excluding amortization of intangible assets and capitalized hosting arrangements
Depreciation and Amortization Excluding Amortization of Intangible Assets and Capitalized Hosting Arrangements
Depreciation and amortization excluding amortization of intangible assets and capitalized hosting arrangements.
Accrued tax distributions to redeemable noncontrolling interest holders
Accrued Tax Distributions To Redeemable Noncontrolling Interest Holders
Accrued tax distributions to redeemable noncontrolling interest holders.
Stockholders' Equity Attributable to Parent [Abstract]
Stockholders’ equity:
Currency loss (gain) on foreign denominated transactions
Foreign Currency Transaction Gain (Loss), before Tax, Total
Foreign Currency Transaction Gain (Loss), before Tax
Entity Address, Address Line Two
Entity Address, Address Line Two
Decrease in accrued bonus
Decrease In Accrued Bonus
Decrease in accrued bonus.
Product [Member]
Amortization of Intangible Assets
Amortization expense of intangible assets
Intangibles amortization
Amortization of Intangible Assets, Total
Award Type [Axis]
Award Type
Company's product offerings
Company's Product Offerings
Company's product offerings.
Receivable [Domain]
Other income (expense), net
Other Nonoperating Income (Expense), Total
Other Nonoperating Income (Expense)
Commitments and contingencies.
Commitments And Contingencies [Line Items]
Commitments And Contingencies [Line Items]
Research and Development Expense, Total
Research and Development Expense
Product, technology, and development
Entity Central Index Key
Entity Central Index Key
Debt Securities, Held-to-Maturity, Type [Extensible Enumeration]
Debt Securities Held To Maturity Type Extensible List
Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets [Line Items]
Net Income (Loss) Attributable to Parent [Abstract]
Numerator:
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability
Obtaining a right-of-use asset in exchange for a finance lease liability
Customer [Axis]
Customer
Accounting Policies [Abstract]
Dealer-to-Dealer
Dealer-to-Dealer [Member]
Dealer-to-Dealer.
Disaggregation of Revenue [Line Items]
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment
Less accumulated depreciation and amortization
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Total
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Beginning Balance
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance
Property, Plant and Equipment [Table]
Schedule Of Property Plant And Equipment [Table]
Recent accounting pronouncements not yet adopted.
Recent Accounting Pronouncements Not Yet Adopted Policy [Text Block]
Recent Accounting Pronouncements not Yet Adopted
Investment [Table Text Block]
Schedule of Investments
Measurement Frequency [Axis]
Measurement Frequency
Share-Based Payment Arrangement [Text Block]
Stock-based Compensation
Accrued liabilities accrued income taxes and other liabilities current.
Accrued Liabilities Accrued Income Taxes And Other Liabilities Current
Accrued expenses, accrued income taxes and other current liabilities
Total
General and Administrative Expense, Total
General and Administrative Expense
General and administrative
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Certificates of deposit due in one year or less, Amortized Cost
Investments
Investments:
Finance Lease, Principal Payments
Payment of finance lease obligations
Research and Development Expense [Member]
Product, Technology, and Development Expense
Deferred financing costs
Debt Issuance Costs, Net
Debt Issuance Costs, Net, Total
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability
Obtaining a right-of-use asset in exchange for an operating lease liability
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Adjustments to reconcile consolidated net income to net cash provided by operating activities:
Retained Earnings [Member]
Retained Earnings
Commitments and contingencies.
Commitments And Contingencies [Table]
Commitments And Contingencies [Table]
Customer [Domain]
Customer
Money Market Funds [Member]
Money Market Funds
Segment Reporting [Abstract]
Effective Income Tax Rate Reconciliation, Percent
Effective income tax rate
Effective Income Tax Rate Reconciliation, Percent, Total
Net (loss) income attributable to redeemable noncontrolling interest
Net income attributable to redeemable noncontrolling interest
Net income loss attributable to redeemable noncontrolling interest dilutive effect.
Net Income Loss Attributable To Redeemable Noncontrolling Interest Dilutive Effect
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Increase reserve for returns and cancellations
Increase Reserve For Returns And Cancellations
Increase reserve for returns and cancellations
Held to maturity fair value.
Held To Maturity Fair Value
Held to maturity fair value
Stock consideration
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable
Issuance of stock for acquisition
Increase In CO incentive unit and subject unit liability-classified awards
Increase In CO Incentive Unit And Subject Unit Liability-Classified Awards
Increase In CO incentive unit and subject unit liability-classified awards.
Property, Plant and Equipment, Gross
Property and equipment, gross
Property, Plant and Equipment, Gross, Total
Property, Plant and Equipment, Gross, Beginning Balance
Property, Plant and Equipment, Gross, Ending Balance
Goodwill, Acquired During Period
CarOffer acquisition
Entity Interactive Data Current
Entity Interactive Data Current
Letters of credit outstanding
Letters of Credit Outstanding, Amount
Accounts Receivable, Credit Loss Expense (Reversal)
Provision for doubtful accounts
Leasehold Improvements [Member]
Leasehold Improvements
Local Phone Number
Local Phone Number
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent
Statutory tax rate
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
Schedule of Fair Value Levels, Assets Measured at Fair Value on Recurring Basis
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Schedule of Reconciliation of Numerator and Denominator Used in Calculation of Basic and Diluted Net Income Per Share
Document and entity information.
Document And Entity Information [Line Items]
Document And Entity Information [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period
Vesting period
Debt Disclosure [Abstract]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Basis of Accounting, Policy [Policy Text Block]
Basis of Presentation
Summary of Revenue from Contracts with Customers by Product
Disaggregation of Revenue [Table Text Block]
Accretion of redeemable noncontrolling interest to redemption value
Temporary Equity, Accretion to Redemption Value, Adjustment
Total
Other Liabilities, Noncurrent
Other non–current liabilities
Income Statement Location [Domain]
Income Statement Location
Property, Plant and Equipment [Abstract]
Long-term debt outstanding
Long-Term Debt
Long-Term Debt, Total
Increase (Decrease) in Prepaid Expense and Other Assets, Total
Increase (Decrease) in Prepaid Expense and Other Assets
Prepaid expenses, prepaid income taxes, and other assets
Temporary Equity, Net Income
Redeemable Noncontrolling Interest, Net income (loss)
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table]
Capitalized stock-based compensation expense in website development and internal-use software costs and hosting arrangements
Share-Based Payment Arrangement, Amount Capitalized
Capitalized website development and internal-use software costs excluded from stock-based compensation expense
Customer Concentration Risk [Member]
Concentration of Credit Risk
Entity Incorporation, Date of Incorporation
Date of incorporation
Common Class A [Member]
Class A Common Stock
Document Fiscal Year Focus
Document Fiscal Year Focus
Market based performance awards.
Market Based Performance Awards [Member]
Market Based Performance Awards
Payment of deferred financing costs
Payments of Debt Issuance Costs
Earnings Per Share, Basic, Total
Earnings Per Share, Basic
Basic
Income Taxes Paid
Cash paid for income taxes
Assets [Abstract]
Assets
CO Incentive Unit and Subject Unit liability-classified awards
Deferred Compensation Liability, Classified, Noncurrent
Deferred Compensation Liability, Classified, Noncurrent, Total
Gross Profit
Gross profit
2021 Incentive Units
Two Thousand Twenty One Car Offer Equity Incentive Units [Member]
Two thousand twenty one car offer equity incentive units.
Prepaid Expense and Other Assets, Current
Prepaid expenses, prepaid income taxes and other current assets
Number of votes entitled to stockholders per share.
Number Of Votes Entitled To Stockholders Per Share
Number of votes entitled to stockholders per share
Long-Lived Tangible Asset [Axis]
Long-Lived Tangible Asset
Business Acquisition, Percentage of Voting Interests Acquired
Business acquisition, percentage of interest acquired
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark
Liabilities and Equity [Abstract]
Liabilities, redeemable noncontrolling interest and stockholders’ equity
Impairment of Intangible Assets, Finite-Lived
Impairment of intangible assets
Antidilutive Securities, Name [Domain]
Antidilutive Securities, Name
Developed Technology Rights [Member]
Developed Technology
Income Tax Authority [Axis]
Income Tax Authority
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
Consolidated net income
Consolidated net income
Assets, Current [Abstract]
Current assets
Finite-Lived Intangible Asset, Expected Amortization, Year Four
2025
Finite-Lived Intangible Asset, Expected Amortization, Year Two
2023
Segment Reporting Disclosure [Text Block]
Segment and Geographic Information
Schedule of Goodwill [Table Text Block]
Summary of Changes in Carrying Value of Goodwill
Fair Value Hierarchy and NAV [Domain]
Fair Value Hierarchy and NAV
Payables and Accruals [Abstract]
Measurement Frequency [Domain]
Measurement Frequency
Increase (Decrease) in Operating Capital [Abstract]
Changes in operating assets and liabilities:
Cover [Abstract]
Incremental Common Shares Attributable to Dilutive Effect of Equity Unit Purchase Agreements
Dilutive effect of share equivalents resulting from unvested restricted stock units
Concentration Risk, Percentage
Concentration of credit risk, percentage
Product and Service [Domain]
Product and Service
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life
Weighted Average Remaining Useful Life (years)
Server and computer equipment
Server And Computer Equipment [Member]
Server and computer equipment.
Trade Accounts Receivable
Trade Accounts Receivable [Member]
Goodwill, Impairment Loss
Impairment of goodwill
Liabilities, Current [Abstract]
Current liabilities
Maximum
Maximum [Member]
Income Tax Examination [Line Items]
Income Tax Examination [Line Items]
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
Summary of Allocation of Stock-based Compensation Expense
Net Cash Provided by (Used in) Investing Activities
Net cash (used in) provided by investing activities
Furniture and Fixtures [Member]
Furniture and Fixtures
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]
Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period
Issuance of common stock upon exercise of stock options, Shares
Goodwill and Intangible Assets Disclosure [Text Block]
Goodwill and Other Intangible Assets
Fair Value, Inputs, Level 3 [Member]
Significant Unobservable Inputs (Level 3 Inputs)
Share-Based Payment Arrangement, Cost by Plan [Table Text Block]
Summary of Stock-based Compensation Expense by Award Type
Use of Estimates, Policy [Policy Text Block]
Use of Estimates
Accounts Receivable [Member]
Net Accounts Receivable
Stock Issued During Period, Value, Stock Options Exercised
Issuance of common stock upon exercise of stock options
Finite-Lived Intangible Asset, Expected Amortization, Year Five
2026
CO Incentive Units, Subject Units and noncontrolling interest
Co Incentive Units Subject Units and Noncontrolling Interest [Member]
Co incentive units subject units and noncontrolling interest.
Foreign Tax Authority [Member]
Foreign
Finite-Lived Intangible Asset, Expected Amortization, Year Three
2024
Common Stock, Shares Authorized
Common stock, shares authorized
Short-Term Debt, Type [Domain]
Trading Symbol
Trading Symbol
Net income attributable to common stockholders - diluted
Net Income (Loss) Available to Common Stockholders, Diluted
Balance Sheet Location [Axis]
Comprehensive income attributable to CarGurus, Inc.
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Accounts Payable, Current, Total
Accounts Payable, Current
Accounts payable
Plan Name [Axis]
Plan Name
Internal Revenue Service (IRS) [Member]
Internal Revenue Service (IRS)
Concentration Risk Type [Domain]
Concentration Risk Type
Marketplace
Marketplace [Member]
Marketplace [Member]
Long-Lived Tangible Asset [Domain]
Long-Lived Tangible Asset
Common Stock, Par or Stated Value Per Share
Common stock, par value
Stock Issued During Period, Shares, Acquisitions
Issuance of common stock upon for acquisition, Shares
Concentration Risk, Credit Risk, Financial Instruments, off-Balance-Sheet Risk
Description of significant off-balance sheet risk
Stock Issued During Period, Value, Acquisitions
Issuance of common stock upon for acquisition
Tax distribution to redeemable noncontrolling interest holders
Tax Distribution to Redeemable Noncontrolling Interest Holders
Tax distribution to redeemable noncontrolling interest holders.
Property, Plant and Equipment Disclosure [Text Block]
Property and Equipment, Net
Debt Instrument [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Potentially dilutive common stock equivalents excluded from calculation of diluted weighted-average shares outstanding
Cash and Cash Equivalents, Fair Value Disclosure
Cash equivalents:
Supplemental noncash disclosure of cash flow information:
Noncash Investing and Financing Items [Abstract]