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Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Revenues Total Revenue Revenue from Contract with Customer, Excluding Assessed Tax Common stock, capital shares reserved for future issuance (in shares) Common Stock, Capital Shares Reserved for Future Issuance BUSINESS COMBINATION Reverse Recapitalization Disclosure [Text Block] Reverse Recapitalization Disclosure Cover [Abstract] Schedule of Long-Term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Level 3 Fair Value, Inputs, Level 3 [Member] Percentage of amount of shares of common stock Share-Based Compensation Arrangement by Share-Based Payment Award, Percentage of Outstanding Stock Maximum STOCK BASED COMPENSATION Share-Based Payment Arrangement [Text Block] REVENUE RECOGNITION CONTRACT ASSETS AND LIABILITIES Revenue from Contract with Customer [Text Block] Contract assets Increase (Decrease) in Contract with Customer, Asset Total liabilities and stockholders’ deficit Liabilities and Equity Schedule Of Reverse Recapitalization [Table] Schedule of Reverse Recapitalization [Table] Schedule of Reverse Recapitalization Related Party [Axis] Related Party [Axis] Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Organization, Consolidation and Presentation of Financial Statements [Abstract] Legacy SpringBig shareholders SpringBig SpringBig Inc Initial Shareholders [Member] SpringBig Inc Initial Shareholders Level 2 Fair Value, Inputs, Level 2 [Member] Current Fiscal Year End Date Current Fiscal Year End Date Less Imputed Interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Net loss per common share - diluted (in dollars per share) Net loss per common share, diluted (in dollars per share) Earnings Per Share, Diluted Weighted Average Vesting (Years) Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Schedule of Stock Issued and Outstanding Schedule of Stock by Class [Table Text Block] Fair value loss on 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Revenue from Contract with Customer Benchmark [Member] Schedule of Lease Liability Maturity Lessee, Operating Lease, Liability, Maturity [Table Text Block] Entity Address, Address Line Two Entity Address, Address Line Two Entity Address, Address Line One Entity Address, Address Line One Cost of revenues Cost of revenues Cost of Revenue Product and Service [Axis] Product and Service [Axis] Class of Stock [Domain] Class of Stock [Domain] Unbilled receivables Unbilled Contracts Receivable Fair Value Disclosures [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] CONVERTIBLE NOTE RECEIVABLE Loans, Notes, Trade and Other Receivables, Excluding Allowance for Credit Losses [Text Block] Equity [Abstract] TCAC initial shareholders TCAC Initial Shareholders [Member] TCAC Initial Shareholders Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Entity Tax Identification Number Entity Tax Identification Number Loss before income tax Income (Loss) Attributable to Parent, before Tax Outstanding beginning balance (in shares) Outstanding ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number Schedule of Short-Term Debt [Table] Schedule of Short-Term Debt [Table] Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Revenue from Contract with Customer [Abstract] Stock-based compensation APIC, Share-Based Payment Arrangement, Option, Increase for Cost Recognition Schedule Of Reverse Recapitalization [Line Items] Schedule Of Reverse Recapitalization [Line Items] Schedule Of Reverse Recapitalization [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Entity Central Index Key Entity Central Index Key Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Interest income Investment Income, Interest Weighted Average Fair Value (Per Share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Derivative liability measurement input Derivative Liability, Measurement Input Concentrations of Credit Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] Majority Shareholder Majority Shareholder [Member] Accrued expenses Other Accrued Liabilities, Current Allowance for Credit Losses Credit Loss, Financial Instrument [Policy Text Block] Measurement Input Type [Axis] Measurement Input Type [Axis] Entity [Domain] Entity [Domain] Accounts payable and other liabilities Increase (Decrease) in Other Accounts Payable and Accrued Liabilities Accounting Standards Update [Domain] Accounting Standards Update [Domain] City Area Code City Area Code General and administrative General and Administrative Expense Assets Assets [Abstract] Adjustment Revision of Prior Period, Adjustment [Member] Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Statement of Stockholders' Equity [Abstract] Other prepaid expenses Other Prepaid Expense, Current Deferred financial advisory fees Due to Related Parties, Current Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] (less) amounts expensed during the period Contract With Customer, Assets, Amounts Expensed During The Year Contract With Customer, Assets, Amounts Expensed During The Year Schedule of Prepaid Expenses and Other Current Assets Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block] Net Loss Per Share Earnings Per Share, Policy [Policy Text Block] Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Retail revenue Deferred retail revenues Retail Revenue [Member] Retail Revenue Deferred Payroll Tax Credits Deferred Payroll Tax Credit, CARES Act [Policy Text Block] Deferred Payroll Tax Credit, CARES Act Warrants outstanding (in shares) Class of Warrant or Right, Outstanding Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Convertible note receivable Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Schedule of Reconciliation of Actual Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Right-of-use assets in exchange for new operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability DESCRIPTION OF BUSINESS Business Description and Basis of Presentation [Text Block] Customer [Domain] Customer [Domain] Warrant liabilities Derivative liability, noncurrent Derivative Liability, Noncurrent