ORGANIZATION AND RELATIONSHIPS (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($) location	Jun. 25, 2023 USD ($)	Jun. 30, 2024 USD ($) location franchise	Jun. 25, 2023 USD ($)	Dec. 31, 2023 USD ($)
Debt Securities, Available-for-Sale [Line Items]
Number of franchise brands | franchise			18
Number of locations | location	2,300		2,300
Percent of total restaurants franchised (as a percent)	92.00%		92.00%
Income (loss) from operations	$ (2,703)	$ 18,465	$ (4,085)	$ 18,852
Accumulated deficit	346,452		346,452		$ 268,777
Negative working capital	170,800		170,800
Redeemable preferred stock	91,836		91,836		91,836
Unrestricted cash	16,576		16,576		$ 37,044
Fixed Rate Secured Notes
Debt Securities, Available-for-Sale [Line Items]
Repurchased amount of notes	104,700		104,700
Fixed Rate Secured Notes
Debt Securities, Available-for-Sale [Line Items]
Debt securities	$ 75,600		$ 75,600