Revenue from Contracts with Customers - Additional Information (Details)	12 Months Ended
	Dec. 25, 2019 USD ($) restaurant revenue_stream	Dec. 26, 2018 USD ($) restaurant
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Number of revenue streams | revenue_stream	2
Number of Restaurants | restaurant	4	4
Contract with Customer, Liability, New Contract Additions	$ 1,457,000	$ 365,000
Hardware Services
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Unsatisfied performance obligations	$ 0
CALIFORNIA
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Number of Restaurants	4
ARIZONA
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Number of Restaurants	7
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract with Customer, Liability, New Contract Additions	$ 700,000