Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Document Type Document Type Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Other (expense) income, net Other Nonoperating Income (Expense) Conversion of redeemable convertible preferred stock to common stock in connection with initial public offering (in shares) Stock Issued During Period, Shares, Conversion of Units Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Total net changes in available-for-sale debt securities Debt Securities, Available-for-sale, Unrealized Gain (Loss) Amortization of interest rate cap premium Amortization of Debt Discount (Premium) One Executive Officer One Executive Officer [Member] One Executive Officer [Member] Change in fair value of hedged interest rate swaps and interest rate cap Change In Fair Value Of Hedged Interest Swap And Interest Rate Cap Change in fair value of hedged interest swap and interest rate cap. 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Prepaid expenses and other current assets Total prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Unvested at beginning of period (in dollars per share) Unvested at ending of period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Proceeds from exercise of stock options, net of cash paid for employee tax withholding Proceeds From Exercise Of Stock Options Net Of Tax Paid For Employee Tax Withholding Proceeds from exercise of stock options net of tax paid for employee tax withholding. 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Unrealized (loss) gain on interest rate cap and swaps Unrealized gain (loss) on interest rate swaps and cap, Net of Tax Amount Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Loss on debt extinguishment Gain (Loss) on Extinguishment of Debt Modified unrecognized compensation expense period Share Based Compensation By Share Based Payment Award Options Outstanding For Which The Vesting Conditions Were Modified Unrecognized Compensation Period Of Recognition share based compensation by share based payment award options outstanding for which the vesting conditions were modified unrecognized compensation period of recognition. 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Beginning Balance (in shares) Ending Balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Schedule Of Share Based Compensation Employee Stock Purchase Plan Activity [Line Items] Schedule Of Share Based Compensation Employee Stock Purchase Plan Activity [Line Items] Schedule of share based compensation employee stock purchase plan activity. Summary of Assets and Liabilities that are Measured at Fair Value on a Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Reclassification of prior hedge effectiveness to net income (loss), Before Tax Amount Other Comprehensive Income Loss Cash Flow Hedge Prior Hedge Effectiveness Reclassification Before Tax Other comprehensive income loss cash flow hedge prior hedge effectiveness reclassification before tax. Derivative liabilities notional amount Derivative Liability, Notional Amount Customer [Axis] Customer [Axis] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Beginning balance, shares Ending balance, shares Shares, Outstanding Preferred stock, $0.001 par value; 100,000 shares authorized at September 30, 2021, none issued or outstanding at September 30, 2021 Preferred Stock, Value, Issued Median Median [Member] Hedging Designation [Domain] Hedging Designation [Domain] Total operating expenses Operating Expenses Exercisable at end of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Common stock par value (in dollars per share) Common Stock, Par or Stated Value Per Share Payment upon extinguishment of hybrid debt Payment for Debt Extinguishment or Debt Prepayment Cost Other comprehensive (loss) income, net of tax: Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Other liabilities Other Liabilities, Noncurrent Deferred income taxes Deferred Income Tax Assets, Net Cancelled/forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Repayment of capital lease obligations Finance Lease, Principal Payments Modified unrecognized compensation expense, RSUs Share Based Compensation By share Based Payment Award Number Of Equity Instruments Other Than Options For Which The Vesting Conditions Were Modified Unrecognized Compensation Share based compensation by share based payment award number of equity instruments other than options for which the vesting conditions were modified unrecognized compensation. Beaumont ABS Limited Beaumont ABS Limited [Member] Beaumont ABS limited. 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Reclassification to net loss upon extinguishment of interest rate swaps, Before Tax Amount Other Comprehensive Income Loss Cash Flow Hedge Extinguishment Of Interest Rate Swap Reclassification Before Tax Other Comprehensive Income Loss Cash Flow Hedge Extinguishment Of Interest Rate Swap Reclassification Before Tax Entity Small Business Entity Small Business Deferred Offering Costs Deferred Offering Costs [Policy Text Block] Deferred offering costs. Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Shares issued (in shares) Sale of Stock, Number of Shares Issued in Transaction Number of shares cancelled in shares buyback program (in shares) Number Of Shares Cancelled In Shares Buyback Program Number of shares cancelled in shares buyback program. 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Change in fair value of financial guarantee Change In Fair Value Of Financial Guarantee Change in fair value of financial guarantee. Income tax payable Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable Shares authorized (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Transaction Transaction [Member] Transaction. Other Other Accrued Liabilities, Current Beginning Balance Cash flow hedges, Net of Tax Amount Ending Balance Cash flow hedges, Net of Tax Amount AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax Event [Domain] Event [Domain] Event [Domain] Proceeds from private placement, net of underwriting discounts and commissions Proceeds from Issuance of Private Placement Reclassification of losses from interest rate cap to net income (loss), Net of Tax Amount Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Rate added to one month LIBOR Debt Instrument, Basis Spread on Variable Rate Added To One Month LIBOR Debt Instrument, Basis Spread on Variable Rate Added To One Month LIBOR Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Entity Central Index Key Entity Central Index Key Outside United States Outside United States [Member] Outside united states. 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Customer One Customer One [Member] Customer one. Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Add: undistributed earnings reallocated to common stockholders Undistributed Earnings (Loss) Available to Common Shareholders, Basic Conversion of Series A redeemable convertible preferred stock into common stock in connection with initial public offering Conversion of Stock, Amount Converted Employee Stock Purchase Plan Employee Stock [Member] Summary of Restricted Stock Unit Activity Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Schedule of derivative instrument [Line Items] Schedule of derivative instrument [Line Items] Schedule of derivative instrument Income Statement Location [Axis] Income Statement Location [Axis] Reclassification upon sale of business, Net of Tax Amount Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax Entity Common Stock, Shares Outstanding (in shares) Entity Common Stock, Shares Outstanding Income Statement Location [Domain] Income Statement Location [Domain] 2023 Lessee, Operating Lease, Liability, to be Paid, Year Two Other Commitments [Line Items] Other Commitments [Line Items] Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Summary of Prepaid Expenses and Other Current Assets Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block] Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Other assets Other Assets, Noncurrent Vesting percentage that was modified Share Based Compensation By Share Based Payment Award Number Of Options Outstanding For Which The Vesting Conditions Were Modified Vesting Percentage Share based compensation by share based payment award number of options outstanding for which the vesting conditions were modified vesting percentage. Plan Name [Axis] Plan Name [Axis] Issuance of common stock Stock Issued During Period, Value, New Issues Temporary equity shares authorized (in shares) Temporary Equity, Shares Authorized Settlement of interest rate swaps Net payments upon settlement of interest rate swaps Net payments upon settlement of interest rate swaps Issuance of common stock upon vesting of restricted stock awards (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Total assets Assets Related Parties Related Party Transactions Disclosure [Text Block] Total derivative liability, net of current portion Derivative Liability, Current Unvested at beginning of period (in shares) Unvested at ending of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Title of 12(b) Security Title of 12(b) Security Impairment of available-for-sale debt securities of $4,912, net of $94 loss recognized in other comprehensive loss Impairment of available-for-sale debt securities Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Recognized in Earnings Unrealized gain (loss), Net of Tax Amount OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Subsequent Event Type [Axis] Subsequent Event Type [Axis] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Gain loss from the cancellation of derivatives Gain Loss On Cancellation Of Derivatives Gain loss on cancellation of derivatives. Minimum non-cancellable commitment Minimum Non Cancellable Commitment Minimum non-cancellable commitment. Cost of revenue Cost of revenue Cost of Sales [Member] Certain Risks and Concentrations Concentration Risk, Credit Risk, Policy [Policy Text Block] Notes receivable from shareholder Adjustment To Additional Paid In Capital Notes Receivable From Shareholder Adjustment to additional paid in capital notes receivable from shareholder. Interest expense, net Interest Expense Net proceeds Sale of Stock, Consideration Received on Transaction Depreciation and amortization expenses Depreciation, Depletion and Amortization Total liabilities Liabilities Loss from impairment, Before Tax Amount Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, before Tax Amortization of prior hedge effectiveness Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments Other Noncurrent Assets Other Noncurrent Assets [Member] Stock-based compensation weighted-average year Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Damages sought value Loss Contingency, Damages Sought, Value Vested and expected to vest at end of period, term Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Commitment fee reduction Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Reduction Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Reduction Contract with customer liability revenue recognized Contract with Customer, Liability, Revenue Recognized Net income attributable to common stockholders—basic Net Income (Loss) Available to Common Stockholders, Basic Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Level 1 Fair Value, Inputs, Level 1 [Member] Unrealized gain (loss) on interest rate swaps and cap, Before Tax Amount Unrealized loss on interest rate swaps and cap, Before Tax Amount Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax 2018 Revolving Facility Two Thousand And Eighteen Revolving Facility [Member] 2018 revolving facility. Restricted cash equivalent Restricted Cash Equivalents Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Accounts payable Increase (Decrease) in Accounts Payable Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Additional Paid-In Capital Additional Paid-in Capital [Member] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Beginning Balance Before Tax Amount Ending Balance Before Tax Amount Accumulated Other Comprehensive Income Loss Before Tax Accumulated other comprehensive income loss before tax. Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Accrued expenses and other liabilities Increase (Decrease) in Accrued Liabilities Asset Class [Axis] Asset Class [Axis] Interest rate swap derivative liability, current portion Derivative Liability Adjustments to reconcile net (loss) income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Common stock shares outstanding (in shares) Common Stock, Shares, Outstanding Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Non-cancellable Agreements With Vendors Non Cancellable Agreements With Vendors [Member] Non-cancellable agreements with vendors. (Loss) income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] IPO IPO [Member] Subsequent Event Subsequent Event [Member] Property, Plant and Equipment Property, Plant and Equipment [Member] Repayment of hybrid debt Repayment Of Hybrid Debt Repayment of hybrid debt. Beginning Balance (in dollars per share) Ending Balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Common stock shares authorized (in shares) Common Stock, Shares Authorized Concentration Risk Type [Axis] Concentration Risk Type [Axis] Effect of potential dilutive securities (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Impairment of long-lived and other assets Impairment of long-lived assets Impairment of Long-Lived Assets Held-for-use Income Statement [Abstract] Income Statement [Abstract] Accumulated Other Comprehensive Loss Accumulated other comprehensive loss AOCI Attributable to Parent [Member] Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Underwriters Option Over-Allotment Option [Member] Total net first lien leverage ratio, second reduction requirement Debt Instrument, Total Net First Lien Leverage Ratio, Second Reduction Requirement Debt Instrument, Total Net First Lien Leverage Ratio, Second Reduction Requirement Reconciliation of cash, cash equivalents, and restricted cash equivalent reported in the consolidated balance sheets Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations [Abstract] Subscription Subscription [Member] Subscription. Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Use of Estimates Use of Estimates, Policy [Policy Text Block] Current assets: Assets, Current [Abstract] Total comprehensive (loss) income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Reclassification to net income (loss) upon extinguishment of interest rate swaps, Net Of Tax Amount Other Comprehensive Income Loss Cash Flow Hedge Extinguishment Of Interest Rate Swap Reclassification After Tax Other Comprehensive Income Loss Cash Flow Hedge Extinguishment Of Interest Rate Swap Reclassification After Tax Retainage period Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Period Of Retention From The Date Of Grant Share based compensation arrangement by share based payment award equity instruments other than options period of retention from the date of grant. Expected dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Preferred stock par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Restricted Stock One [Domain] Restricted Stock One [Domain] Restricted Stock One [Domain] Legal Entity [Axis] Legal Entity [Axis] Purchase of property and equipment Payments to Acquire Property, Plant, and Equipment City Area Code City Area Code Counterdemand by the Vendors Counterdemand By The Vendors [Member] Counterdemand By The Vendors [Member] Series A redeemable convertible preferred stock, $0.001 par value; 30,512 shares authorized at December 31, 2020; 23,081 shares issued and outstanding at December 31, 2020 Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount Document Period End Date Document Period End Date Long-term Debt Long-term Debt [Text Block] Accrued sales, use and business taxes Sales and Excise Tax Payable, Current Vesting percentage that was modified, RSUs Share Based Compensation By Share Based Payment Award Number Of Equity Instruments Other Than Options Outstanding For Which The Vesting Conditions Were Modified Vesting Percentage Share based compensation by share based payment award number of equity instruments other than options outstanding for which the vesting conditions were modified vesting percentage. Less: amounts attributable to redeemable convertible preferred stock Redeemable Preferred Stock Dividends Loss from impairment Loss from impairment Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Net of Tax, Portion Attributable to Parent, Available-for-sale Securities New fair value of units due to remeasurement Share Based Compensation By Share Based Payment Award Number Of Equity Instruments Other Than Options Outstanding For Which Accelerated Vesting is Applicable Gross Compensation Expense Share based compensation by share based payment award number of equity instruments other than options outstanding for which accelerated vesting is applicable gross compensation expense. Summary of Revenue Recognition Disaggregation of Revenue [Table Text Block] Interest rate caps and swaps Interest Rate Caps And Swaps [Member] Interest rate caps and swaps. 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Cancelled/forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Schedule of Fair Value Assumptions and Techniques for Stock Options Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Entity Interactive Data Current Entity Interactive Data Current Employees Employees [Member] Employees [Member] Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Fair Value Measurements Fair Value Disclosures [Text Block] Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Schedule of Stock Options Activity Share-based Payment Arrangement, Option, Activity [Table Text Block] Accounts Receivable Accounts Receivable [Member] Interest rate swaps Interest Rate Swap [Member] Customer [Domain] Customer [Domain] Unusual or Infrequent Item, or Both [Axis] Unusual or Infrequent Item, or Both [Axis] Additional paid-in capital Additional Paid in Capital, Common Stock Entity Registrant Name Entity Registrant Name Beginning Balance Net of Tax Amount Ending Balance Net of Tax Amount Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Subsequent Event Type [Domain] Subsequent Event Type [Domain] Basis spread on variable rate, initial reduction Debt Instrument, Basis Spread on Variable Rate, Initial Reduction Debt Instrument, Basis Spread on Variable Rate, Initial Reduction Derivative [Table] Derivative [Table] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Service Based Vesting Service Based Vesting [Member] Service Based Vesting [Member] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Debt issuance costs Debt Issuance Costs, Net Weighted-Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Effective interest rate Debt Instrument, Interest Rate, Effective Percentage Restricted money market fund Restricted Money Market Fund [Member] Restricted money market fund. Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Investments [Abstract] Investments [Abstract] Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Total minimum lease payments Lessee, Operating Lease, Liability, to be Paid Impairment other than temporary on available for sale investments recognized in the income statement Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale Deferred offering costs non current Deferred Offering Costs Non Current Deferred offering costs non current. 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Special dividends Adjustment To Additional Paid In Capital Special Dividends Adjustment to additional paid in capital special dividends. Sale of Stock [Domain] Sale of Stock [Domain] Plan Name [Domain] Plan Name [Domain] Accrued vendor payables Accrued Vendor Payables Accrued vendor payables. 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Accumulated Deficit Retained Earnings [Member] Preferred stock shares outstanding (in shares) Preferred Stock, Shares Outstanding Schedule of Earnings Per Share Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table Text Block] Payment of contingent consideration Payment for Contingent Consideration Liability, Financing Activities 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] Effective tax rate Effective Income Tax Rate Reconciliation, Percent Total stock-based compensation expense Expense Before Capitalized Software [Member] Expense before capitalized software. Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities General and administrative Other General and Administrative Expense Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Weighted Average Remaining Contractual Life (in Years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Beginning balance Ending balance Accounts Receivable, Allowance for Credit Loss Award Type [Domain] Award Type [Domain] Restricted Stock [Domain] Restricted Stock [Domain] Restricted Stock [Domain] Trading Symbol Trading Symbol Earth Class Mail, Inc. Earth Class Mail, Inc. [Member] Earth Class Mail, Inc. 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Private Placement Private Placement [Member] Basic and Diluted Earnings Per Share Earnings Per Share [Text Block] Interest expense on derivatives Discontinuance of interest rate swaps and prior hedge effectiveness Interest expense on derivatives Interest expense on derivatives Other Financial Information [Abstract] Other Financial Information [Abstract] Other financial information. Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Property plant and equipment percent Property Plant And Equipment Percent Property plant and equipment percent. Current liabilities: Liabilities, Current [Abstract] Entity Shell Company Entity Shell Company Shares surrendered for settlement of minimum statutory tax withholdings (in shares) Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation 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 Reclassification from restricted cash and cash equivalents to cash and cash equivalents Reclassification From Restricted Cash And Cash Equivalents To Cash And Cash Equivalents Reclassification from restricted cash and cash equivalents to cash and cash equivalents. 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