Cover [Abstract] Document Information [Table] Document Information [Line Items] Entity Central Index Key Document Type Amendment Flag Entity Ex Transition Period Entity Filer Category Entity Small Business Entity Emerging Growth Company Entity Registrant Name Entity Address, State or Province Entity Incorporation, State or Country Code Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Statement of Financial Position [Abstract] CONSOLIDATED BALANCE SHEETS Statement [Table] Statement [Line Items] Assets [Abstract] Assets: Assets, Current [Abstract] Current Assets Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Assets, Current Total current assets Other receivables Receivables from Customers Healthcare receivable Other Assets, Current Other assets, current Other assets Other Short-term Investments Short-term investments Debt Securities, Available-for-sale, Current Investment securities, available-for sale (Amortized cost: 2021: $1,001; 2020: $0) Other Assets, Noncurrent Other assets, non-current Debt Securities, Held-to-maturity, Current Investment securities, held-to-maturity (Fair value: 2021: $0; 2020: $266) AccruedRetrospectivePremiumsCurrent Accrued retrospective premiums Accrued retrospective premiums. Debt Securities, Available-for-sale Investment securities, available-for sale (Amortized cost: 2021: $35,281; 2020: $53,953) Fair value Debt Securities, Held-to-maturity, Noncurrent Investment securities, held-to-maturity (Fair value: 2021: $703; 2020: $471) Property, Plant and Equipment, Net Property and equipment, net Property and equipment, net Operating Lease, Right-of-Use Asset Operating lease right-of-use assets Operating lease ROU assets Reinsurance Recoverables, Including Reinsurance Premium Paid Reinsurance recoverable Goodwill Goodwill Goodwill Other Intangible Assets Other intangible assets Other intangible assets. Goodwill and Other Intangible Assets Goodwill and other intangible assets Goodwill and other intangible assets. Assets Total assets Liabilities and Equity [Abstract] Liabilities and stockholders' deficit Liabilities, Current [Abstract] Current liabilities Assumed Liability for Unpaid Claims and Claims Adjustment Expense Unpaid claims Derivative Liability, Noncurrent Derivative liabilities Fair value of embedded derivatives Accrued Salaries Accrued salaries and benefits Liabilities, Current Total current liabilities Convertible Notes Payable, Current Current portion of notes and securities payable Other Liabilities, Current Other liabilities, current Accounts Payable, Current Accounts payable and accrued expenses Operating Lease, Liability, Current Operating lease liabilities Long-term Debt and Lease Obligation Long-term operating lease liabilities Other Liabilities Other liabilities, non-current Notes and Loans Payable Notes and securities payable, net of discounts and deferred issuance costs Warrants and Rights Outstanding Warrants payable Warrants outstanding, aggregate value Liability, Premium Deficiency Testing on Long-Duration Contract, Amount Premium deficiency reserve Liabilities Total liabilities Stockholders' Equity Attributable to Parent [Abstract] Stockholders' equity Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive (income) loss Additional Paid in Capital Additional paid-in capital Additional paid-in capital Retained Earnings (Accumulated Deficit) Accumulated deficit Stockholders' Equity Attributable to Parent Clover stockholders' equity (deficit) Common Stock, Value, Issued Common Stock, Value Commitments and Contingencies Commitments and Contingencies (Note 22) Temporary Equity, Carrying Amount, Attributable to Parent Convertible Preferred stock Convertible Preferred stock (Series Seed A, A-1, B, C, and D), $0.0001 par value; 155,387,025 shares authorized as of December 31, 2020 and 2019; 139,444,346 shares; after reverse capitalization, issued and outstanding as of December 31, 2020 and 2019; aggregate liquidation preference of $470,256 as of December 31, 2020 Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total stockholders' equity (deficit) Balance Balance Stockholders' Equity Attributable to Noncontrolling Interest Non-controlling interest Liabilities and Equity Total liabilities, convertible preferred stock and stockholders' equity Common Class B [Member] Class B Common Stock Common Class B [Member] Common Class A [Member] Class A Common Stock Common Class A [Member] Reverse Capitalization [Axis] Reverse Capitalization [Domain] Reverse Capitalization [Member] Preferred Stock, Shares Issued Preferred stock, shares issued Preferred stock, shares issued Preferred Stock Issued Preferred Stock, Par or Stated Value Per Share Preferred stock per share Preferred stock, par value per share Preferred Stock, Shares Outstanding Preferred stock, shares outstanding Preferred stock, shares outstanding Preferred Stock Outstanding Common Stock, Par or Stated Value Per Share Common Stock, Par or Stated Value Per Share Common Stock, Par or Stated Value Per Share Preferred Stock, Shares Authorized Preferred stock, shares authorized Preferred stock, shares authorized Preferred Stock Authorized HeldToMaturitySecuritiesFairValueCurrent Investment securities, held-to-maturity, Fair value current Held to maturity securities fair value current. Debt Securities, Available-for-sale, Amortized Cost, Noncurrent Investment securities, available-for sale, Amortized cost Noncurrent HeldToMaturitySecuritiesFairValueNonCurrent Investment securities, held-to-maturity, Fair value Noncurrent Held to maturity securities fair value non current. Debt Securities, Available-for-sale, Amortized Cost, Current Investment securities, available-for sale, Amortized cost current Preferred Stock, Liquidation Preference, Value Liquidation preference Common Stock, Shares Authorized Common stock, shares authorized Common Stock, Shares, Issued Common stock, shares, issued Common Stock, Shares, Outstanding Common stock, shares, outstanding Income Statement [Abstract] CONSOLIDATED STATEMENTS OF OPERATIONS Operating Income (Loss) Loss from operations Loss from operations Net Income (Loss) Attributable to Parent Net loss Net loss Net loss Weighted Average Number of Shares Outstanding, Basic and Diluted Basic and diluted weighted average number of common shares and common share equivalents outstanding Weighted average shares outstanding, basic and diluted Basic and diluted weighted average number of common shares and common share equivalents outstanding Revenues [Abstract] Revenues: Revenue Not from Contract with Customer, Other Other income Premiums Earned, Net Premiums earned, net Net premiums earned Revenues Total revenues Investment Income, Net Operating Expenses [Abstract] Operating expenses: Expenses: Employee Benefits and Share-based Compensation Salaries and benefits Depreciation, Depletion and Amortization, Nonproduction Depreciation and amortization Depreciation and amortization expense Other General Expense Other expense General and Administrative Expense General and administrative expenses Premium Deficiency Testing Benefit Expense LongDuration Contract Amount Premium deficiency reserve (benefit) expense Premium Deficiency Testing (Benefit) Expense Long-duration Contract Amount. Policyholder Benefits and Claims Incurred, Net Net medical claims incurred Net claims incurred and claims adjustment expense Operating Expenses Total operating expenses Accretion (Amortization) of Discounts and Premiums, Investments Amortization of notes and securities discounts Amortization of notes discount Derivative, Gain (Loss) on Derivative, Net (Gain) loss on derivative Gain loss on derivative Fair Value Adjustment of Warrants Change in fair value of warrants payable Change in fair value of warrants expense Interest Expense Interest expense Earnings Per Share [Abstract] Per share data: Income (Loss) from Continuing Operations, Per Basic and Diluted Share Net loss per share attributable to common stockholders basic and diluted Net loss per share attributable to common stockholders basic and diluted OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax Unrealized (gain) loss on available-for-sale investments Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive loss CommonStockExchangeRatio Common Stock Exchange Ratio Common stock exchange ratio. Ceded Premiums Earned Net of ceded premiums Statement of Stockholders' Equity [Abstract] CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY (DEFICIT) CapitalContributionForExtinguishmentOfDebt Capital contribution for extinguishment of debt Capital contribution for extinguishment of debt. AcquisitionOfPublicAndPrivatePlacementWarrants Acquisition of Public and Private Placement Warrants Acquisition of public and private placement warrants. Shares, Outstanding Balance (in shares) Balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Stock issuance for exercise of stock options, net of early exercise liability (in shares) Number of Options, Exercised Stock Issued During Period, Value, Stock Options Exercised Stock issuance for exercise of stock options, net of early exercise liability Stock Issued During Period, Shares, Conversion of Convertible Securities Convertible debt conversion and other issuances (in shares) StockIssuedDuringPeriodValueBusinessCombinationAndOffering Issuance of Common Stock in connection with Business Combination and PIPE offering Stock issued during period, value, business combination and offering. StockIssuedDuringPeriodSharesBusinessCombinationAndOffering Issuance of Common Stock in connection with Business Combination and PIPE offering (in shares) Stock issued during period shares business combination and offering. ConversionFromCommonStock Conversion from Class B Common Stock to Class A Common Stock (in shares) Conversion from common stock. Available For Sale Equity Securities Gross Unrealized Gain (Loss) Unrealized holdings gain on investment securities, available-for-sale Available for sale equity securities gross unrealized gain loss. APIC, Share-based Payment Arrangement, Increase for Cost Recognition Stock-based compensation StockIssuedDuringPeriodSharesWarrantsExercised Common stock issued related to warrants exercised (in shares) Stock issued during period shares warrants exercised. Stock Issued During Period, Value, Conversion of Convertible Securities Convertible debt conversion and other issuances Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature Beneficial conversion feature Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Interests issued Stock Issued During Period, Value, Conversion of Units Preferred stock conversion Stock Issued During Period, Shares, Conversion of Units Preferred stock conversion (in shares) StockIssuedDuringPeriodValueWarrantsExercised Common stock issued related to warrants exercised Stock issued during period value warrants exercised. Stockholders' Equity Note, Changes in Capital Structure, Subsequent Changes to Number of Common Shares Retroactive application of reverse capitalization Stock Redeemed or Called During Period, Value Buyback and subsequent cancellation of common shares, Value Cash paid for redemption of common stock Stock Redeemed or Called During Period, Shares Buyback and subsequent cancellation of common shares, shares Shares redeemed for cash Stockholders Equity Note Changes In Capital Structure Subsequent Changes To Number Of Common Shares One Retroactive application of reverse capitalization Stockholders Equity Note Changes In Capital Structure Subsequent Changes To Number Of Common Shares One Convertible Preferred Stock [Member] Convertible Preferred stock Convertible Preferred Stock [Member] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Retained Earnings [Member] Accumulated deficit Additional Paid-in Capital [Member] Additional Paid-in Capital Common Stock [Member] Common Stock Noncontrolling Interest [Member] Noncontrolling interest AOCI Attributable to Parent [Member] Accumulated other comprehensive income (loss) Revision of Prior Period [Axis] Revision of Prior Period [Domain] Previously Reported [Member] Revision of Prior Period, Reclassification, Adjustment [Member] Statement of Cash Flows [Abstract] CONSOLIDATED STATEMENTS OF CASH FLOWS Net Cash Provided by (Used in) Investing Activities [Abstract] Cash Flows from Investing Activities: Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities Net cash (used in) provided by investing activities Payments to Acquire Available-for-sale Securities Purchases of available-for-sale securities Proceeds from Sale of Available-for-sale Securities Proceeds from sales of available-for-sale securities Proceeds from Sale and Maturity of Debt Securities, Available-for-sale Proceeds from maturities of available-for-sale securities Payments to Acquire Property, Plant, and Equipment Purchases of property and equipment Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities Proceeds from maturities of held-to-maturity securities Proceeds from Divestiture of Businesses, Net of Cash Divested Acquisition of business, net of cash acquired Net Cash Provided by (Used in) Financing Activities [Abstract] Cash Flows from Financing Activities: Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities Net cash provided by (used in) financing activities Repayments of Notes Payable Payment of notes payable principal Proceeds from Issuance of Common Stock Issuance of common stock, net of early exercise liability Proceeds from Issuance of Common Stock ProceedsFromReverseCapitalizationNetOfTransactionCosts Proceeds from reverse capitalization, net of transaction costs Proceeds from reverse capitalization, net of transaction costs. Proceeds from (Payments to) Noncontrolling Interests Acquisition of noncontrolling interest Proceeds from Issuance of Convertible Preferred Stock Proceeds from issuance of convertible securities Proceeds from issuance of convertible preferred stock Payments of Financing Costs Deferred financing costs Payments for Repurchase of Common Stock Buyback and subsequent cancellation of common stock Proceeds from Noncontrolling Interests Issuance of noncontrolling interest Net Cash Provided by (Used in) Operating Activities [Abstract] Cash Flows from Operating Activities: Cash flows from operating activities: Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: IncreaseDecreaseInPremiumDeficiencyReserve Premium deficiency reserve Increase decrease in premium deficiency reserve. Increase (Decrease) in Other Noncurrent Liabilities Other liabilities Increase (Decrease) in Other Receivables Other receivables Increase (Decrease) in Other Operating Assets Other assets Increase (Decrease) in Accounts Receivable Healthcare receivables IncreaseDecreaseInOperatingLeaseRightOfUseAssets Operating lease right-of-use assets Increase decrease in operating lease right of use assets. IncreaseDecreaseInUnpaidClaims Unpaid claims Increase decrease in unpaid claims. Increase (Decrease) in Accounts Payable and Accrued Liabilities Accounts payable and accrued expenses Increase (Decrease) in Accrued Salaries Accrued salaries and benefits Increase (Decrease) in Unearned Premiums Accrued retrospective premiums Increase Decrease In Operating Lease Liabilities Operating lease liabilities Increase Decrease In Operating Lease Liabilities. Increase (Decrease) in Reinsurance Recoverable Reinsurance recoverable Increase (Decrease) in Reinsurance Payables Reinsurance premium payable Increase (Decrease) in Deferred Liabilities Deferred rent Net Cash Provided by (Used in) Operating Activities Net cash used in operating activities Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net loss to net cash used in operating activities: Paid-in-Kind Interest Paid in kind interest IncreaseDecreaseInFairValueAdjustmentOfWarrants Change in fair value of warrants payable Change in fair value of warrants Increase decrease in fair value adjustment of warrants. AmortizationOfNotesAndSecuritiesDiscounts Amortization of notes and securities discounts Amortization of notes and securities discounts. Increase (Decrease) in Derivative Liabilities Change in derivative liabilities Depreciation, Amortization and Accretion, Net Accretion, net of amortization Share-based Payment Arrangement, Noncash Expense Stock-based compensation expense Gain (Loss) on Investments Net realized losses (gains) on investment securities AmortizationExpensesOfWarrants Amortization of warrants Amortization expenses of warrants. Amortization of Debt Issuance Costs Amortization of debt issuance costs Gain (Loss) on Disposition of Property Plant Equipment Loss on disposal of property and equipment Asset Impairment Charges Asset impairment charges Impairment charges Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net loss