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Investing and Financing Activities Disclosure [Abstract] Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Earnings Per Share, Basic [Abstract] Earnings Per Share [Abstract] Other income, net Other income, net Nonoperating Income (Expense) Prepaid expenses Increase (Decrease) in Prepaid Expense Deferred revenues, current and long-term Increase (Decrease) in Contract with Customer, Liability Restaurant sales Franchisor Owned Outlet [Member] Cash paid for income taxes, net of refunds Income Taxes Paid, Net Exercised, weighted average exercise price (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Award Timing Disclosures [Line Items] Carrying Value Long-Term Debt, Gross Accrued compensation Employee-related Liabilities, Current Property, fixtures and equipment, net of accumulated depreciation of $303,086 and $285,706, respectively Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Fiscal Period Fiscal Period, Policy [Policy Text Block] Net loss Net loss Net loss Net Income (Loss) Attributable to Parent Expiration Date Trading Arrangement Expiration Date Vested, weighted average grant date fair value (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value Balance, beginning of period Balance, end of period Contract with Customer, Liability, Franchise Fee Revenue Contract with Customer, Liability, Franchise Fee Revenue Other Other Accrued Liabilities, Current Schedule of Components of Income Tax Expense (Benefit) and Effective Income Tax Rate Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Award vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Adoption Date Trading Arrangement Adoption Date Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Accounts receivable Increase (Decrease) in Accounts Receivable Entity Current Reporting Status Entity Current Reporting Status Receivables [Abstract] Derivative [Line Items] Derivative [Line Items] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Income from operations Operating Income (Loss) Line of Credit Line of Credit [Member] Weighted-average discount rate Leases, Weighted Average Discount Rate [Abstract] Leases, Weighted Average Discount Rate Accumulated deficit Retained Earnings (Accumulated Deficit) Statement of Financial Position [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Executive Category: Executive Category [Axis] Finance lease liabilities - current Finance Lease, Liability, Current Current Fiscal Year End Date Current Fiscal Year End Date Other restaurant operating expenses Other Cost of Operating Revenue Remeasurements and terminations of finance lease assets and lease liabilities Remeasurements Of Finance Lease Assets And Lease Liabilities Remeasurements Of Finance Lease Assets And Lease Liabilities Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Current portion of long-term debt Portion of Long-term Debt, Current Accounts Receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Payables and Accruals [Abstract] WEIGHTED AVERAGE GRANT DATE 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] Statement [Table] Statement [Table] Derivative liabilities Derivative Liability Deferred income taxes Deferred Income Tax Expense (Benefit) Adjustments to reconcile net loss to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Cash received Contract with Customer, Liability, Franchise Fee Revenue, Cash Received Contract with Customer, Liability, Cash Received Balance, beginning of period Balance, end of period Contract with Customer, Liability, Gift Card Revenue Contract with Customer, Liability, Gift Card Revenue Cash flows from financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Variable Rate [Domain] Variable Rate [Domain] Finance lease liabilities - non-current Finance Lease, Liability, Noncurrent Nature of Business and Organization Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Stock units outstanding not included in diluted net (loss) income per share as their effect is anti-dilutive (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount All Adjustments to Compensation All Adjustments to Compensation [Member] Amendment Flag Amendment Flag In-restaurant dining sales In-Restaurant Dining Sales [Member] In-Restaurant Dining Sales Leases Lessee, Operating Leases [Text Block] Termination Date Trading Arrangement Termination Date Net cash (used in) provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] WEIGHTED AVERAGE GRANT DATE FAIR VALUE PER SHARE Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Measure: Measure [Axis] Three years Share-Based Payment Arrangement, Tranche Three [Member] Operating leases Operating Lease, Weighted Average Discount Rate, Percent Weighted average common shares outstanding - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Computations of Basic and Diluted Net Income (Loss) Per Common Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Total lease assets Lease, Right-of-Use Asset Lease, Right-of-Use Asset Options exercisable, end of period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Segment Reporting [Abstract] Remeasurements and terminations of operating lease assets and lease liabilities Remeasurements Of Operating Lease Assets And Lease Liabilities Remeasurements Of Operating Lease Assets And Lease Liabilities Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares Debt Disclosure [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Entity Tax Identification Number Entity Tax Identification Number Operating costs and expenses Costs and Expenses [Abstract] Deferred gift card revenue Contract with Customer, Liability, Gift Card Revenue, Current Contract with Customer, Liability, Gift Card Revenue, Current Outstanding, beginning of period, weighted average exercise price (in dollars per share) Outstanding, end of period, weighted average exercise price (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares issued (in shares) Common Stock, Shares, Issued Operating leases Operating Lease, Weighted Average Remaining Lease Term Use of Estimates Use of Estimates, Policy [Policy Text Block] Operating cash flows - finance leases Finance Lease, Interest Payment on Liability Interest expense Interest expense Interest Expense, Nonoperating Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Royalty and system fund contributions Royalty And System Fund Contributions [Member] Royalty And System Fund Contributions Insider Trading Arrangements [Line 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Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation