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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 25, 2022 USD ($) restaurant state | Sep. 26, 2021 USD ($) restaurant | Sep. 25, 2022 USD ($) segment restaurant state | Sep. 26, 2021 USD ($) restaurant | Dec. 26, 2021 USD ($)
Change in Accounting Estimate [Line Items] |  |  |  |  |
Number of restaurants | restaurant | 176 |  | 176 |  |
Number of states | state | 16 |  | 16 |  |
Number of restaurants opened | restaurant | 10 |  | 26 |  |
Operating segments | segment |  |  | 1 |  |
Reportable segments | segment |  |  | 1 |  |
Impairment of long-lived assets and closed-store costs | $ 1,693 | $ 4,415 | $ 1,845 | $ 4,415 |
Business exit costs | 9,800 |  | 9,800 |  |
Restructuring charges | $ 11,081 | $ 0 | $ 11,081 | $ 0 |
Workforce reductions percentage | 5.00% |  | 5.00% |  |
Future lease liability | $ 2,700 |  | $ 2,700 |  |
Contingent consideration liability fair value | 18,322 |  | 18,322 |  | $ 20,477
Accounts receivable | 4,579 |  | 4,579 |  | 2,644
Federal deposit insurance corporation (up to) |  |  | 300 |  |
Deferred costs | $ 5,300 |  | $ 5,300 |  |
Amortization period of deferred costs |  |  | 7 years |  |
Accounting Standards Update [Extensible Enumeration] |  |  | Accounting Standards Update 2016-02 [Member] |  |
One store intended to close |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Number of restaurants | restaurant | 1 |  | 1 |  |
Impairment of long-lived assets and closed-store costs | $ 1,700 |  | $ 1,700 |  |
Certain company restaurants and two Spyce stores |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Number of restaurants | restaurant |  | 2 |  | 2 |
Impairment of long-lived assets and closed-store costs |  | $ 4,400 |  | $ 4,400 |
One Spyce store closed |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Number of restaurants | restaurant | 1 |  | 1 |  |
Business exit costs |  |  | $ 200 |  |
Facility Closing |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Business exit costs | $ 6,800 |  | 6,800 |  |
Future Lease Liability, Net Sublease |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Business exit costs | 3,000 |  | 3,000 |  |
Employee Severance |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Business exit costs | 600 |  | 600 |  |
Abandonment of Potential Future Restaurant Sites |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Business exit costs | 600 |  | 600 |  |
Other Restructuring |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Business exit costs | 100 |  | 100 |  |
Accumulated Deficit | Cumulative-effect adjustment | Pro Forma |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Cumulative-effect adjustment | 4,200 |  | 4,200 |  |
Minimum | Cumulative-effect adjustment | Pro Forma |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Operating lease liabilities | 263,000 |  | 263,000 |  |
Right-of-use assets | 222,000 |  | 222,000 |  |
Prepaid rent | 1,500 |  | 1,500 |  |
Minimum | Accumulated Deficit | Cumulative-effect adjustment | Pro Forma |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Cumulative-effect adjustment | 400 |  | 400 |  |
Maximum | Cumulative-effect adjustment | Pro Forma |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Operating lease liabilities | 291,000 |  | 291,000 |  |
Right-of-use assets | 246,000 |  | 246,000 |  |
Prepaid rent | 2,000 |  | 2,000 |  |
Maximum | Accumulated Deficit | Cumulative-effect adjustment | Pro Forma |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Cumulative-effect adjustment | $ 500 |  | $ 500 |  |
New York City metropolitan area | Geographic | Revenue |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Concentration risk percentage | 32.00% | 33.00% | 32.00% | 33.00% |
Credit card processors |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Accounts receivable | $ 2,100 |  | $ 2,100 |  | $ 1,100
Spyce |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Research and development cost | 400 |  | 1,400 |  |
Contingent consideration liability | 16,400 |  | 16,400 |  |
Contingent consideration liability fair value | $ 18,300 |  | $ 18,300 |  |

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